// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/trees/layer_tree_host_impl.h"

#include <algorithm>
#include <cmath>

#include "base/bind.h"
#include "base/command_line.h"
#include "base/containers/hash_tables.h"
#include "base/containers/scoped_ptr_hash_map.h"
#include "cc/animation/scrollbar_animation_controller_thinning.h"
#include "cc/base/latency_info_swap_promise.h"
#include "cc/base/math_util.h"
#include "cc/input/page_scale_animation.h"
#include "cc/input/top_controls_manager.h"
#include "cc/layers/append_quads_data.h"
#include "cc/layers/delegated_renderer_layer_impl.h"
#include "cc/layers/heads_up_display_layer_impl.h"
#include "cc/layers/io_surface_layer_impl.h"
#include "cc/layers/layer_impl.h"
#include "cc/layers/painted_scrollbar_layer_impl.h"
#include "cc/layers/render_surface_impl.h"
#include "cc/layers/solid_color_layer_impl.h"
#include "cc/layers/solid_color_scrollbar_layer_impl.h"
#include "cc/layers/texture_layer_impl.h"
#include "cc/layers/tiled_layer_impl.h"
#include "cc/output/begin_frame_args.h"
#include "cc/output/compositor_frame_ack.h"
#include "cc/output/compositor_frame_metadata.h"
#include "cc/output/copy_output_request.h"
#include "cc/output/copy_output_result.h"
#include "cc/output/gl_renderer.h"
#include "cc/quads/render_pass_draw_quad.h"
#include "cc/quads/solid_color_draw_quad.h"
#include "cc/quads/texture_draw_quad.h"
#include "cc/quads/tile_draw_quad.h"
#include "cc/resources/layer_tiling_data.h"
#include "cc/test/animation_test_common.h"
#include "cc/test/begin_frame_args_test.h"
#include "cc/test/fake_layer_tree_host_impl.h"
#include "cc/test/fake_output_surface.h"
#include "cc/test/fake_output_surface_client.h"
#include "cc/test/fake_picture_layer_impl.h"
#include "cc/test/fake_picture_pile_impl.h"
#include "cc/test/fake_proxy.h"
#include "cc/test/geometry_test_utils.h"
#include "cc/test/layer_test_common.h"
#include "cc/test/layer_tree_test.h"
#include "cc/test/render_pass_test_common.h"
#include "cc/test/test_gpu_memory_buffer_manager.h"
#include "cc/test/test_shared_bitmap_manager.h"
#include "cc/test/test_web_graphics_context_3d.h"
#include "cc/trees/layer_tree_impl.h"
#include "cc/trees/single_thread_proxy.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkMallocPixelRef.h"
#include "ui/gfx/frame_time.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/geometry/vector2d_conversions.h"

using ::testing::Mock;
using ::testing::Return;
using ::testing::AnyNumber;
using ::testing::AtLeast;
using ::testing::_;

namespace cc {
namespace {

class LayerTreeHostImplTest : public testing::Test,
                              public LayerTreeHostImplClient {
 public:
  LayerTreeHostImplTest()
      : proxy_(base::MessageLoopProxy::current(),
               base::MessageLoopProxy::current()),
        always_impl_thread_(&proxy_),
        always_main_thread_blocked_(&proxy_),
        shared_bitmap_manager_(new TestSharedBitmapManager),
        gpu_memory_buffer_manager_(new TestGpuMemoryBufferManager),
        on_can_draw_state_changed_called_(false),
        did_notify_ready_to_activate_(false),
        did_request_commit_(false),
        did_request_redraw_(false),
        did_request_animate_(false),
        did_request_prepare_tiles_(false),
        did_complete_page_scale_animation_(false),
        reduce_memory_result_(true),
        current_limit_bytes_(0),
        current_priority_cutoff_value_(0) {
  }

  LayerTreeSettings DefaultSettings() {
    LayerTreeSettings settings;
    settings.minimum_occlusion_tracking_size = gfx::Size();
    settings.impl_side_painting = true;
    settings.renderer_settings.texture_id_allocation_chunk_size = 1;
    settings.report_overscroll_only_for_scrollable_axes = true;
    settings.use_pinch_virtual_viewport = true;
    return settings;
  }

  void SetUp() override {
    CreateHostImpl(DefaultSettings(), CreateOutputSurface());
  }

  void TearDown() override {}

  void UpdateRendererCapabilitiesOnImplThread() override {}
  void DidLoseOutputSurfaceOnImplThread() override {}
  void CommitVSyncParameters(base::TimeTicks timebase,
                             base::TimeDelta interval) override {}
  void SetEstimatedParentDrawTime(base::TimeDelta draw_time) override {}
  void SetMaxSwapsPendingOnImplThread(int max) override {}
  void DidSwapBuffersOnImplThread() override {}
  void DidSwapBuffersCompleteOnImplThread() override {}
  void OnCanDrawStateChanged(bool can_draw) override {
    on_can_draw_state_changed_called_ = true;
  }
  void NotifyReadyToActivate() override {
    did_notify_ready_to_activate_ = true;
    host_impl_->ActivateSyncTree();
  }
  void NotifyReadyToDraw() override {}
  void SetNeedsRedrawOnImplThread() override { did_request_redraw_ = true; }
  void SetNeedsRedrawRectOnImplThread(const gfx::Rect& damage_rect) override {
    did_request_redraw_ = true;
  }
  void SetNeedsAnimateOnImplThread() override { did_request_animate_ = true; }
  void SetNeedsPrepareTilesOnImplThread() override {
    did_request_prepare_tiles_ = true;
  }
  void SetNeedsCommitOnImplThread() override { did_request_commit_ = true; }
  void PostAnimationEventsToMainThreadOnImplThread(
      scoped_ptr<AnimationEventsVector> events) override {}
  bool ReduceContentsTextureMemoryOnImplThread(size_t limit_bytes,
                                               int priority_cutoff) override {
    current_limit_bytes_ = limit_bytes;
    current_priority_cutoff_value_ = priority_cutoff;
    return reduce_memory_result_;
  }
  bool IsInsideDraw() override { return false; }
  void RenewTreePriority() override {}
  void PostDelayedScrollbarFadeOnImplThread(const base::Closure& start_fade,
                                            base::TimeDelta delay) override {
    scrollbar_fade_start_ = start_fade;
    requested_scrollbar_animation_delay_ = delay;
  }
  void DidActivateSyncTree() override {}
  void DidPrepareTiles() override {}
  void DidCompletePageScaleAnimationOnImplThread() override {
    did_complete_page_scale_animation_ = true;
  }

  void set_reduce_memory_result(bool reduce_memory_result) {
    reduce_memory_result_ = reduce_memory_result;
  }

  virtual bool CreateHostImpl(const LayerTreeSettings& settings,
                              scoped_ptr<OutputSurface> output_surface) {
    host_impl_ = LayerTreeHostImpl::Create(settings,
                                           this,
                                           &proxy_,
                                           &stats_instrumentation_,
                                           shared_bitmap_manager_.get(),
                                           gpu_memory_buffer_manager_.get(),
                                           0);
    bool init = host_impl_->InitializeRenderer(output_surface.Pass());
    host_impl_->SetViewportSize(gfx::Size(10, 10));
    return init;
  }

  void SetupRootLayerImpl(scoped_ptr<LayerImpl> root) {
    root->SetPosition(gfx::PointF());
    root->SetBounds(gfx::Size(10, 10));
    root->SetContentBounds(gfx::Size(10, 10));
    root->SetDrawsContent(true);
    root->draw_properties().visible_content_rect = gfx::Rect(0, 0, 10, 10);
    root->SetHasRenderSurface(true);
    host_impl_->active_tree()->SetRootLayer(root.Pass());
  }

  static void ExpectClearedScrollDeltasRecursive(LayerImpl* layer) {
    ASSERT_EQ(layer->ScrollDelta(), gfx::Vector2d());
    for (size_t i = 0; i < layer->children().size(); ++i)
      ExpectClearedScrollDeltasRecursive(layer->children()[i]);
  }

  static void ExpectContains(const ScrollAndScaleSet& scroll_info,
                             int id,
                             const gfx::Vector2d& scroll_delta) {
    int times_encountered = 0;

    for (size_t i = 0; i < scroll_info.scrolls.size(); ++i) {
      if (scroll_info.scrolls[i].layer_id != id)
        continue;
      EXPECT_VECTOR_EQ(scroll_delta, scroll_info.scrolls[i].scroll_delta);
      times_encountered++;
    }

    ASSERT_EQ(1, times_encountered);
  }

  static void ExpectNone(const ScrollAndScaleSet& scroll_info, int id) {
    int times_encountered = 0;

    for (size_t i = 0; i < scroll_info.scrolls.size(); ++i) {
      if (scroll_info.scrolls[i].layer_id != id)
        continue;
      times_encountered++;
    }

    ASSERT_EQ(0, times_encountered);
  }

  LayerImpl* CreateScrollAndContentsLayers(LayerTreeImpl* layer_tree_impl,
                                           const gfx::Size& content_size) {
    const int kInnerViewportScrollLayerId = 2;
    const int kInnerViewportClipLayerId = 4;
    const int kPageScaleLayerId = 5;
    scoped_ptr<LayerImpl> root =
        LayerImpl::Create(layer_tree_impl, 1);
    root->SetBounds(content_size);
    root->SetContentBounds(content_size);
    root->SetPosition(gfx::PointF());
    root->SetHasRenderSurface(true);

    scoped_ptr<LayerImpl> scroll =
        LayerImpl::Create(layer_tree_impl, kInnerViewportScrollLayerId);
    LayerImpl* scroll_layer = scroll.get();
    scroll->SetIsContainerForFixedPositionLayers(true);
    scroll->SetScrollOffset(gfx::ScrollOffset());

    scoped_ptr<LayerImpl> clip =
        LayerImpl::Create(layer_tree_impl, kInnerViewportClipLayerId);
    clip->SetBounds(
        gfx::Size(content_size.width() / 2, content_size.height() / 2));

    scoped_ptr<LayerImpl> page_scale =
        LayerImpl::Create(layer_tree_impl, kPageScaleLayerId);

    scroll->SetScrollClipLayer(clip->id());
    scroll->SetBounds(content_size);
    scroll->SetContentBounds(content_size);
    scroll->SetPosition(gfx::PointF());
    scroll->SetIsContainerForFixedPositionLayers(true);

    scoped_ptr<LayerImpl> contents =
        LayerImpl::Create(layer_tree_impl, 3);
    contents->SetDrawsContent(true);
    contents->SetBounds(content_size);
    contents->SetContentBounds(content_size);
    contents->SetPosition(gfx::PointF());

    scroll->AddChild(contents.Pass());
    page_scale->AddChild(scroll.Pass());
    clip->AddChild(page_scale.Pass());
    root->AddChild(clip.Pass());

    layer_tree_impl->SetRootLayer(root.Pass());
    layer_tree_impl->SetViewportLayersFromIds(
        Layer::INVALID_ID, kPageScaleLayerId, kInnerViewportScrollLayerId,
        Layer::INVALID_ID);

    return scroll_layer;
  }

  LayerImpl* SetupScrollAndContentsLayers(const gfx::Size& content_size) {
    LayerImpl* scroll_layer = CreateScrollAndContentsLayers(
        host_impl_->active_tree(), content_size);
    host_impl_->active_tree()->DidBecomeActive();
    return scroll_layer;
  }

  // TODO(wjmaclean) Add clip-layer pointer to parameters.
  scoped_ptr<LayerImpl> CreateScrollableLayer(int id,
                                              const gfx::Size& size,
                                              LayerImpl* clip_layer) {
    DCHECK(clip_layer);
    DCHECK(id != clip_layer->id());
    scoped_ptr<LayerImpl> layer =
        LayerImpl::Create(host_impl_->active_tree(), id);
    layer->SetScrollClipLayer(clip_layer->id());
    layer->SetDrawsContent(true);
    layer->SetBounds(size);
    layer->SetContentBounds(size);
    clip_layer->SetBounds(gfx::Size(size.width() / 2, size.height() / 2));
    return layer.Pass();
  }

  void DrawFrame() {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }

  void pinch_zoom_pan_viewport_forces_commit_redraw(float device_scale_factor);
  void pinch_zoom_pan_viewport_test(float device_scale_factor);
  void pinch_zoom_pan_viewport_and_scroll_test(float device_scale_factor);
  void pinch_zoom_pan_viewport_and_scroll_boundary_test(
      float device_scale_factor);

  void CheckNotifyCalledIfCanDrawChanged(bool always_draw) {
    // Note: It is not possible to disable the renderer once it has been set,
    // so we do not need to test that disabling the renderer notifies us
    // that can_draw changed.
    EXPECT_FALSE(host_impl_->CanDraw());
    on_can_draw_state_changed_called_ = false;

    // Set up the root layer, which allows us to draw.
    SetupScrollAndContentsLayers(gfx::Size(100, 100));
    EXPECT_TRUE(host_impl_->CanDraw());
    EXPECT_TRUE(on_can_draw_state_changed_called_);
    on_can_draw_state_changed_called_ = false;

    // Toggle the root layer to make sure it toggles can_draw
    host_impl_->active_tree()->SetRootLayer(nullptr);
    EXPECT_FALSE(host_impl_->CanDraw());
    EXPECT_TRUE(on_can_draw_state_changed_called_);
    on_can_draw_state_changed_called_ = false;

    SetupScrollAndContentsLayers(gfx::Size(100, 100));
    EXPECT_TRUE(host_impl_->CanDraw());
    EXPECT_TRUE(on_can_draw_state_changed_called_);
    on_can_draw_state_changed_called_ = false;

    // Toggle the device viewport size to make sure it toggles can_draw.
    host_impl_->SetViewportSize(gfx::Size());
    if (always_draw) {
      EXPECT_TRUE(host_impl_->CanDraw());
    } else {
      EXPECT_FALSE(host_impl_->CanDraw());
    }
    EXPECT_TRUE(on_can_draw_state_changed_called_);
    on_can_draw_state_changed_called_ = false;

    host_impl_->SetViewportSize(gfx::Size(100, 100));
    EXPECT_TRUE(host_impl_->CanDraw());
    EXPECT_TRUE(on_can_draw_state_changed_called_);
    on_can_draw_state_changed_called_ = false;

    // Toggle contents textures purged without causing any evictions,
    // and make sure that it does not change can_draw.
    set_reduce_memory_result(false);
    host_impl_->SetMemoryPolicy(ManagedMemoryPolicy(
        host_impl_->memory_allocation_limit_bytes() - 1));
    EXPECT_TRUE(host_impl_->CanDraw());
    EXPECT_FALSE(on_can_draw_state_changed_called_);
    on_can_draw_state_changed_called_ = false;

    // Toggle contents textures purged to make sure it toggles can_draw.
    set_reduce_memory_result(true);
    host_impl_->SetMemoryPolicy(ManagedMemoryPolicy(
        host_impl_->memory_allocation_limit_bytes() - 1));
    if (always_draw) {
      EXPECT_TRUE(host_impl_->CanDraw());
    } else {
      EXPECT_FALSE(host_impl_->CanDraw());
    }
    EXPECT_TRUE(on_can_draw_state_changed_called_);
    on_can_draw_state_changed_called_ = false;

    host_impl_->active_tree()->ResetContentsTexturesPurged();
    EXPECT_TRUE(host_impl_->CanDraw());
    EXPECT_TRUE(on_can_draw_state_changed_called_);
    on_can_draw_state_changed_called_ = false;
  }

  void SetupMouseMoveAtWithDeviceScale(float device_scale_factor);

 protected:
  virtual scoped_ptr<OutputSurface> CreateOutputSurface() {
    return FakeOutputSurface::Create3d();
  }

  void DrawOneFrame() {
    LayerTreeHostImpl::FrameData frame_data;
    host_impl_->PrepareToDraw(&frame_data);
    host_impl_->DidDrawAllLayers(frame_data);
  }

  FakeProxy proxy_;
  DebugScopedSetImplThread always_impl_thread_;
  DebugScopedSetMainThreadBlocked always_main_thread_blocked_;

  scoped_ptr<TestSharedBitmapManager> shared_bitmap_manager_;
  scoped_ptr<TestGpuMemoryBufferManager> gpu_memory_buffer_manager_;
  scoped_ptr<LayerTreeHostImpl> host_impl_;
  FakeRenderingStatsInstrumentation stats_instrumentation_;
  bool on_can_draw_state_changed_called_;
  bool did_notify_ready_to_activate_;
  bool did_request_commit_;
  bool did_request_redraw_;
  bool did_request_animate_;
  bool did_request_prepare_tiles_;
  bool did_complete_page_scale_animation_;
  bool reduce_memory_result_;
  base::Closure scrollbar_fade_start_;
  base::TimeDelta requested_scrollbar_animation_delay_;
  size_t current_limit_bytes_;
  int current_priority_cutoff_value_;
};

TEST_F(LayerTreeHostImplTest, NotifyIfCanDrawChanged) {
  bool always_draw = false;
  CheckNotifyCalledIfCanDrawChanged(always_draw);
}

TEST_F(LayerTreeHostImplTest, CanDrawIncompleteFrames) {
  CreateHostImpl(DefaultSettings(),
                 FakeOutputSurface::CreateAlwaysDrawAndSwap3d());

  bool always_draw = true;
  CheckNotifyCalledIfCanDrawChanged(always_draw);
}

TEST_F(LayerTreeHostImplTest, ScrollDeltaNoLayers) {
  ASSERT_FALSE(host_impl_->active_tree()->root_layer());

  scoped_ptr<ScrollAndScaleSet> scroll_info = host_impl_->ProcessScrollDeltas();
  ASSERT_EQ(scroll_info->scrolls.size(), 0u);
}

TEST_F(LayerTreeHostImplTest, ScrollDeltaTreeButNoChanges) {
  {
    scoped_ptr<LayerImpl> root =
        LayerImpl::Create(host_impl_->active_tree(), 1);
    root->AddChild(LayerImpl::Create(host_impl_->active_tree(), 2));
    root->AddChild(LayerImpl::Create(host_impl_->active_tree(), 3));
    root->children()[1]->AddChild(
        LayerImpl::Create(host_impl_->active_tree(), 4));
    root->children()[1]->AddChild(
        LayerImpl::Create(host_impl_->active_tree(), 5));
    root->children()[1]->children()[0]->AddChild(
        LayerImpl::Create(host_impl_->active_tree(), 6));
    host_impl_->active_tree()->SetRootLayer(root.Pass());
  }
  LayerImpl* root = host_impl_->active_tree()->root_layer();

  ExpectClearedScrollDeltasRecursive(root);

  scoped_ptr<ScrollAndScaleSet> scroll_info;

  scroll_info = host_impl_->ProcessScrollDeltas();
  ASSERT_EQ(scroll_info->scrolls.size(), 0u);
  ExpectClearedScrollDeltasRecursive(root);

  scroll_info = host_impl_->ProcessScrollDeltas();
  ASSERT_EQ(scroll_info->scrolls.size(), 0u);
  ExpectClearedScrollDeltasRecursive(root);
}

TEST_F(LayerTreeHostImplTest, ScrollDeltaRepeatedScrolls) {
  gfx::ScrollOffset scroll_offset(20, 30);
  gfx::Vector2d scroll_delta(11, -15);
  {
    scoped_ptr<LayerImpl> root_clip =
        LayerImpl::Create(host_impl_->active_tree(), 2);
    scoped_ptr<LayerImpl> root =
        LayerImpl::Create(host_impl_->active_tree(), 1);
    root_clip->SetBounds(gfx::Size(10, 10));
    LayerImpl* root_layer = root.get();
    root_clip->AddChild(root.Pass());
    root_layer->SetBounds(gfx::Size(110, 110));
    root_layer->SetScrollClipLayer(root_clip->id());
    root_layer->SetScrollOffset(scroll_offset);
    root_layer->ScrollBy(scroll_delta);
    host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  }
  LayerImpl* root = host_impl_->active_tree()->root_layer()->children()[0];

  scoped_ptr<ScrollAndScaleSet> scroll_info;

  scroll_info = host_impl_->ProcessScrollDeltas();
  ASSERT_EQ(scroll_info->scrolls.size(), 1u);
  EXPECT_VECTOR_EQ(root->sent_scroll_delta(), scroll_delta);
  ExpectContains(*scroll_info, root->id(), scroll_delta);

  gfx::Vector2d scroll_delta2(-5, 27);
  root->ScrollBy(scroll_delta2);
  scroll_info = host_impl_->ProcessScrollDeltas();
  ASSERT_EQ(scroll_info->scrolls.size(), 1u);
  EXPECT_VECTOR_EQ(root->sent_scroll_delta(), scroll_delta + scroll_delta2);
  ExpectContains(*scroll_info, root->id(), scroll_delta + scroll_delta2);

  root->ScrollBy(gfx::Vector2d());
  scroll_info = host_impl_->ProcessScrollDeltas();
  EXPECT_EQ(root->sent_scroll_delta(), scroll_delta + scroll_delta2);
}

TEST_F(LayerTreeHostImplTest, ScrollRootCallsCommitAndRedraw) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  EXPECT_TRUE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(),
                                                      InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  EXPECT_TRUE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(0, 10),
                                                      InputHandler::Wheel));
  host_impl_->ScrollEnd();
  EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(),
                                                       InputHandler::Wheel));
  EXPECT_TRUE(did_request_redraw_);
  EXPECT_TRUE(did_request_commit_);
}

TEST_F(LayerTreeHostImplTest, ScrollActiveOnlyAfterScrollMovement) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  EXPECT_FALSE(host_impl_->IsActivelyScrolling());
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  EXPECT_TRUE(host_impl_->IsActivelyScrolling());
  host_impl_->ScrollEnd();
  EXPECT_FALSE(host_impl_->IsActivelyScrolling());
}

TEST_F(LayerTreeHostImplTest, ScrollWithoutRootLayer) {
  // We should not crash when trying to scroll an empty layer tree.
  EXPECT_EQ(InputHandler::ScrollIgnored,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
}

TEST_F(LayerTreeHostImplTest, ScrollWithoutRenderer) {
  scoped_ptr<TestWebGraphicsContext3D> context_owned =
      TestWebGraphicsContext3D::Create();
  context_owned->set_context_lost(true);

  // Initialization will fail.
  EXPECT_FALSE(CreateHostImpl(
      DefaultSettings(), FakeOutputSurface::Create3d(context_owned.Pass())));

  SetupScrollAndContentsLayers(gfx::Size(100, 100));

  // We should not crash when trying to scroll after the renderer initialization
  // fails.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
}

TEST_F(LayerTreeHostImplTest, ReplaceTreeWhileScrolling) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  // We should not crash if the tree is replaced while we are scrolling.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  host_impl_->active_tree()->DetachLayerTree();

  scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));

  // We should still be scrolling, because the scrolled layer also exists in the
  // new tree.
  gfx::Vector2d scroll_delta(0, 10);
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  host_impl_->ScrollEnd();
  scoped_ptr<ScrollAndScaleSet> scroll_info = host_impl_->ProcessScrollDeltas();
  ExpectContains(*scroll_info, scroll_layer->id(), scroll_delta);
}

TEST_F(LayerTreeHostImplTest, WheelEventHandlers) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();
  LayerImpl* root = host_impl_->active_tree()->root_layer();

  root->SetHaveWheelEventHandlers(true);

  // With registered event handlers, wheel scrolls have to go to the main
  // thread.
  EXPECT_EQ(InputHandler::ScrollOnMainThread,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));

  // But gesture scrolls can still be handled.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
}

TEST_F(LayerTreeHostImplTest, FlingOnlyWhenScrollingTouchscreen) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  // Ignore the fling since no layer is being scrolled
  EXPECT_EQ(InputHandler::ScrollIgnored,
            host_impl_->FlingScrollBegin());

  // Start scrolling a layer
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));

  // Now the fling should go ahead since we've started scrolling a layer
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->FlingScrollBegin());
}

TEST_F(LayerTreeHostImplTest, FlingOnlyWhenScrollingTouchpad) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  // Ignore the fling since no layer is being scrolled
  EXPECT_EQ(InputHandler::ScrollIgnored,
            host_impl_->FlingScrollBegin());

  // Start scrolling a layer
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));

  // Now the fling should go ahead since we've started scrolling a layer
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->FlingScrollBegin());
}

TEST_F(LayerTreeHostImplTest, NoFlingWhenScrollingOnMain) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();
  LayerImpl* root = host_impl_->active_tree()->root_layer();

  root->SetShouldScrollOnMainThread(true);

  // Start scrolling a layer
  EXPECT_EQ(InputHandler::ScrollOnMainThread,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));

  // The fling should be ignored since there's no layer being scrolled impl-side
  EXPECT_EQ(InputHandler::ScrollIgnored,
            host_impl_->FlingScrollBegin());
}

TEST_F(LayerTreeHostImplTest, ShouldScrollOnMainThread) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();
  LayerImpl* root = host_impl_->active_tree()->root_layer();

  root->SetShouldScrollOnMainThread(true);

  EXPECT_EQ(InputHandler::ScrollOnMainThread,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  EXPECT_EQ(InputHandler::ScrollOnMainThread,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
}

TEST_F(LayerTreeHostImplTest, NonFastScrollableRegionBasic) {
  SetupScrollAndContentsLayers(gfx::Size(200, 200));
  host_impl_->SetViewportSize(gfx::Size(100, 100));

  LayerImpl* root = host_impl_->active_tree()->root_layer();
  root->SetContentsScale(2.f, 2.f);
  root->SetNonFastScrollableRegion(gfx::Rect(0, 0, 50, 50));

  DrawFrame();

  // All scroll types inside the non-fast scrollable region should fail.
  EXPECT_EQ(InputHandler::ScrollOnMainThread,
            host_impl_->ScrollBegin(gfx::Point(25, 25),
                                    InputHandler::Wheel));
  EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(25, 25),
                                                       InputHandler::Wheel));
  EXPECT_EQ(InputHandler::ScrollOnMainThread,
            host_impl_->ScrollBegin(gfx::Point(25, 25),
                                    InputHandler::Gesture));
  EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(25, 25),
                                                       InputHandler::Gesture));

  // All scroll types outside this region should succeed.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(75, 75),
                                    InputHandler::Wheel));
  EXPECT_TRUE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(75, 75),
                                                      InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(25, 25),
                                                       InputHandler::Gesture));
  host_impl_->ScrollEnd();
  EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(75, 75),
                                                       InputHandler::Gesture));
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(75, 75),
                                    InputHandler::Gesture));
  EXPECT_TRUE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(75, 75),
                                                      InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  host_impl_->ScrollEnd();
  EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(75, 75),
                                                       InputHandler::Gesture));
}

TEST_F(LayerTreeHostImplTest, NonFastScrollableRegionWithOffset) {
  SetupScrollAndContentsLayers(gfx::Size(200, 200));
  host_impl_->SetViewportSize(gfx::Size(100, 100));

  LayerImpl* root = host_impl_->active_tree()->root_layer();
  root->SetContentsScale(2.f, 2.f);
  root->SetNonFastScrollableRegion(gfx::Rect(0, 0, 50, 50));
  root->SetPosition(gfx::PointF(-25.f, 0.f));

  DrawFrame();

  // This point would fall into the non-fast scrollable region except that we've
  // moved the layer down by 25 pixels.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(40, 10),
                                    InputHandler::Wheel));
  EXPECT_TRUE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(40, 10),
                                                      InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 1));
  host_impl_->ScrollEnd();

  // This point is still inside the non-fast region.
  EXPECT_EQ(InputHandler::ScrollOnMainThread,
            host_impl_->ScrollBegin(gfx::Point(10, 10),
                                    InputHandler::Wheel));
}

TEST_F(LayerTreeHostImplTest, ScrollHandlerNotPresent) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(200, 200));
  EXPECT_FALSE(scroll_layer->have_scroll_event_handlers());
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  EXPECT_FALSE(host_impl_->scroll_affects_scroll_handler());
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
  EXPECT_FALSE(host_impl_->scroll_affects_scroll_handler());
  host_impl_->ScrollEnd();
  EXPECT_FALSE(host_impl_->scroll_affects_scroll_handler());
}

TEST_F(LayerTreeHostImplTest, ScrollHandlerPresent) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(200, 200));
  scroll_layer->SetHaveScrollEventHandlers(true);
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  EXPECT_FALSE(host_impl_->scroll_affects_scroll_handler());
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
  EXPECT_TRUE(host_impl_->scroll_affects_scroll_handler());
  host_impl_->ScrollEnd();
  EXPECT_FALSE(host_impl_->scroll_affects_scroll_handler());
}

TEST_F(LayerTreeHostImplTest, ScrollByReturnsCorrectValue) {
  SetupScrollAndContentsLayers(gfx::Size(200, 200));
  host_impl_->SetViewportSize(gfx::Size(100, 100));

  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));

  // Trying to scroll to the left/top will not succeed.
  EXPECT_FALSE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(-10, 0)).did_scroll);
  EXPECT_FALSE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -10)).did_scroll);
  EXPECT_FALSE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(-10, -10)).did_scroll);

  // Scrolling to the right/bottom will succeed.
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(10, 0)).did_scroll);
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10)).did_scroll);
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(10, 10)).did_scroll);

  // Scrolling to left/top will now succeed.
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(-10, 0)).did_scroll);
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -10)).did_scroll);
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(-10, -10)).did_scroll);

  // Scrolling diagonally against an edge will succeed.
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(10, -10)).did_scroll);
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(-10, 0)).did_scroll);
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(-10, 10)).did_scroll);

  // Trying to scroll more than the available space will also succeed.
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(5000, 5000)).did_scroll);
}

TEST_F(LayerTreeHostImplTest, ScrollVerticallyByPageReturnsCorrectValue) {
  SetupScrollAndContentsLayers(gfx::Size(200, 2000));
  host_impl_->SetViewportSize(gfx::Size(100, 1000));

  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(),
                                    InputHandler::Wheel));

  // Trying to scroll without a vertical scrollbar will fail.
  EXPECT_FALSE(host_impl_->ScrollVerticallyByPage(
      gfx::Point(), SCROLL_FORWARD));
  EXPECT_FALSE(host_impl_->ScrollVerticallyByPage(
      gfx::Point(), SCROLL_BACKWARD));

  scoped_ptr<PaintedScrollbarLayerImpl> vertical_scrollbar(
      PaintedScrollbarLayerImpl::Create(
          host_impl_->active_tree(),
          20,
          VERTICAL));
  vertical_scrollbar->SetBounds(gfx::Size(15, 1000));
  host_impl_->InnerViewportScrollLayer()->AddScrollbar(
      vertical_scrollbar.get());

  // Trying to scroll with a vertical scrollbar will succeed.
  EXPECT_TRUE(host_impl_->ScrollVerticallyByPage(
      gfx::Point(), SCROLL_FORWARD));
  EXPECT_FLOAT_EQ(875.f,
                  host_impl_->InnerViewportScrollLayer()->ScrollDelta().y());
  EXPECT_TRUE(host_impl_->ScrollVerticallyByPage(
      gfx::Point(), SCROLL_BACKWARD));
}

TEST_F(LayerTreeHostImplTest, ScrollWithUserUnscrollableLayers) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(200, 200));
  host_impl_->SetViewportSize(gfx::Size(100, 100));

  gfx::Size overflow_size(400, 400);
  ASSERT_EQ(1u, scroll_layer->children().size());
  LayerImpl* overflow = scroll_layer->children()[0];
  overflow->SetBounds(overflow_size);
  overflow->SetContentBounds(overflow_size);
  overflow->SetScrollClipLayer(scroll_layer->parent()->id());
  overflow->SetScrollOffset(gfx::ScrollOffset());
  overflow->SetPosition(gfx::PointF());

  DrawFrame();
  gfx::Point scroll_position(10, 10);

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(scroll_position, InputHandler::Wheel));
  EXPECT_VECTOR_EQ(gfx::Vector2dF(), scroll_layer->TotalScrollOffset());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(), overflow->TotalScrollOffset());

  gfx::Vector2dF scroll_delta(10, 10);
  host_impl_->ScrollBy(scroll_position, scroll_delta);
  host_impl_->ScrollEnd();
  EXPECT_VECTOR_EQ(gfx::Vector2dF(), scroll_layer->TotalScrollOffset());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 10), overflow->TotalScrollOffset());

  overflow->set_user_scrollable_horizontal(false);

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(scroll_position, InputHandler::Wheel));
  EXPECT_VECTOR_EQ(gfx::Vector2dF(), scroll_layer->TotalScrollOffset());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 10), overflow->TotalScrollOffset());

  host_impl_->ScrollBy(scroll_position, scroll_delta);
  host_impl_->ScrollEnd();
  EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 0), scroll_layer->TotalScrollOffset());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 20), overflow->TotalScrollOffset());

  overflow->set_user_scrollable_vertical(false);

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(scroll_position, InputHandler::Wheel));
  EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 0), scroll_layer->TotalScrollOffset());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 20), overflow->TotalScrollOffset());

  host_impl_->ScrollBy(scroll_position, scroll_delta);
  host_impl_->ScrollEnd();
  EXPECT_VECTOR_EQ(gfx::Vector2dF(20, 10), scroll_layer->TotalScrollOffset());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 20), overflow->TotalScrollOffset());
}

TEST_F(LayerTreeHostImplTest, ImplPinchZoom) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  EXPECT_EQ(scroll_layer, host_impl_->InnerViewportScrollLayer());
  LayerImpl* container_layer = scroll_layer->scroll_clip_layer();
  EXPECT_EQ(gfx::Size(50, 50), container_layer->bounds());

  float min_page_scale = 1.f, max_page_scale = 4.f;
  float page_scale_factor = 1.f;

  // The impl-based pinch zoom should adjust the max scroll position.
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(
        page_scale_factor, min_page_scale, max_page_scale);
    host_impl_->SetPageScaleOnActiveTree(page_scale_factor);
    scroll_layer->SetScrollDelta(gfx::Vector2d());

    float page_scale_delta = 2.f;

    host_impl_->ScrollBegin(gfx::Point(50, 50), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(50, 50));
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();
    EXPECT_FALSE(did_request_animate_);
    EXPECT_TRUE(did_request_redraw_);
    EXPECT_TRUE(did_request_commit_);
    EXPECT_EQ(gfx::Size(50, 50), container_layer->bounds());

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, page_scale_delta);

    EXPECT_EQ(gfx::ScrollOffset(75.0, 75.0).ToString(),
              scroll_layer->MaxScrollOffset().ToString());
  }

  // Scrolling after a pinch gesture should always be in local space.  The
  // scroll deltas have the page scale factor applied.
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(
        page_scale_factor, min_page_scale, max_page_scale);
    host_impl_->SetPageScaleOnActiveTree(page_scale_factor);
    scroll_layer->SetScrollDelta(gfx::Vector2d());

    float page_scale_delta = 2.f;
    host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point());
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();

    gfx::Vector2d scroll_delta(0, 10);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(5, 5),
                                      InputHandler::Wheel));
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    ExpectContains(*scroll_info.get(), scroll_layer->id(),
                   gfx::Vector2d(0, scroll_delta.y() / page_scale_delta));
  }
}

TEST_F(LayerTreeHostImplTest, ScrollWithSwapPromises) {
  ui::LatencyInfo latency_info;
  latency_info.trace_id = 1234;
  scoped_ptr<SwapPromise> swap_promise(
      new LatencyInfoSwapPromise(latency_info));

  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  host_impl_->QueueSwapPromiseForMainThreadScrollUpdate(swap_promise.Pass());
  host_impl_->ScrollEnd();

  scoped_ptr<ScrollAndScaleSet> scroll_info = host_impl_->ProcessScrollDeltas();
  EXPECT_EQ(1u, scroll_info->swap_promises.size());
  EXPECT_EQ(latency_info.trace_id, scroll_info->swap_promises[0]->TraceId());
}

TEST_F(LayerTreeHostImplTest, PinchGesture) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  LayerImpl* scroll_layer = host_impl_->InnerViewportScrollLayer();
  DCHECK(scroll_layer);

  float min_page_scale = 1.f;
  float max_page_scale = 4.f;

  // Basic pinch zoom in gesture
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                           max_page_scale);
    scroll_layer->SetScrollDelta(gfx::Vector2d());

    float page_scale_delta = 2.f;
    host_impl_->ScrollBegin(gfx::Point(50, 50), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(50, 50));
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();
    EXPECT_FALSE(did_request_animate_);
    EXPECT_TRUE(did_request_redraw_);
    EXPECT_TRUE(did_request_commit_);

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, page_scale_delta);
  }

  // Zoom-in clamping
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                           max_page_scale);
    scroll_layer->SetScrollDelta(gfx::Vector2d());
    float page_scale_delta = 10.f;

    host_impl_->ScrollBegin(gfx::Point(50, 50), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(50, 50));
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, max_page_scale);
  }

  // Zoom-out clamping
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                           max_page_scale);
    scroll_layer->SetScrollDelta(gfx::Vector2d());
    scroll_layer->SetScrollOffset(gfx::ScrollOffset(50, 50));

    float page_scale_delta = 0.1f;
    host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point());
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, min_page_scale);

    EXPECT_TRUE(scroll_info->scrolls.empty());
  }

  // Two-finger panning should not happen based on pinch events only
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                           max_page_scale);
    scroll_layer->SetScrollDelta(gfx::Vector2d());
    scroll_layer->SetScrollOffset(gfx::ScrollOffset(20, 20));

    float page_scale_delta = 1.f;
    host_impl_->ScrollBegin(gfx::Point(10, 10), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(10, 10));
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(20, 20));
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, page_scale_delta);
    EXPECT_TRUE(scroll_info->scrolls.empty());
  }

  // Two-finger panning should work with interleaved scroll events
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                           max_page_scale);
    scroll_layer->SetScrollDelta(gfx::Vector2d());
    scroll_layer->SetScrollOffset(gfx::ScrollOffset(20, 20));

    float page_scale_delta = 1.f;
    host_impl_->ScrollBegin(gfx::Point(10, 10), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(10, 10));
    host_impl_->ScrollBy(gfx::Point(10, 10), gfx::Vector2d(-10, -10));
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point(20, 20));
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, page_scale_delta);
    ExpectContains(*scroll_info, scroll_layer->id(), gfx::Vector2d(-10, -10));
  }

  // Two-finger panning should work when starting fully zoomed out.
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(0.5f, 0.5f, 4.f);
    scroll_layer->SetScrollDelta(gfx::Vector2d());
    scroll_layer->SetScrollOffset(gfx::ScrollOffset(0, 0));

    host_impl_->ScrollBegin(gfx::Point(0, 0), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(2.f, gfx::Point(0, 0));
    host_impl_->PinchGestureUpdate(1.f, gfx::Point(0, 0));
    host_impl_->ScrollBy(gfx::Point(0, 0), gfx::Vector2d(10, 10));
    host_impl_->PinchGestureUpdate(1.f, gfx::Point(10, 10));
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, 2.f);
    ExpectContains(*scroll_info, scroll_layer->id(), gfx::Vector2d(20, 20));
  }
}

TEST_F(LayerTreeHostImplTest, PageScaleAnimation) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  LayerImpl* scroll_layer = host_impl_->InnerViewportScrollLayer();
  DCHECK(scroll_layer);

  float min_page_scale = 0.5f;
  float max_page_scale = 4.f;
  base::TimeTicks start_time = base::TimeTicks() +
                               base::TimeDelta::FromSeconds(1);
  base::TimeDelta duration = base::TimeDelta::FromMilliseconds(100);
  base::TimeTicks halfway_through_animation = start_time + duration / 2;
  base::TimeTicks end_time = start_time + duration;

  // Non-anchor zoom-in
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                           max_page_scale);
    scroll_layer->SetScrollOffset(gfx::ScrollOffset(50, 50));

    did_request_redraw_ = false;
    did_request_animate_ = false;
    host_impl_->active_tree()->SetPendingPageScaleAnimation(
        scoped_ptr<PendingPageScaleAnimation>(new PendingPageScaleAnimation(
            gfx::Vector2d(),
            false,
            2.f,
            duration)));
    host_impl_->ActivateSyncTree();
    EXPECT_FALSE(did_request_redraw_);
    EXPECT_TRUE(did_request_animate_);

    did_request_redraw_ = false;
    did_request_animate_ = false;
    host_impl_->Animate(start_time);
    EXPECT_TRUE(did_request_redraw_);
    EXPECT_TRUE(did_request_animate_);

    did_request_redraw_ = false;
    did_request_animate_ = false;
    host_impl_->Animate(halfway_through_animation);
    EXPECT_TRUE(did_request_redraw_);
    EXPECT_TRUE(did_request_animate_);

    did_request_redraw_ = false;
    did_request_animate_ = false;
    did_request_commit_ = false;
    host_impl_->Animate(end_time);
    EXPECT_TRUE(did_request_commit_);
    EXPECT_FALSE(did_request_animate_);

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, 2);
    ExpectContains(*scroll_info, scroll_layer->id(), gfx::Vector2d(-50, -50));
  }

  // Anchor zoom-out
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                           max_page_scale);
    scroll_layer->SetScrollOffset(gfx::ScrollOffset(50, 50));

    did_request_redraw_ = false;
    did_request_animate_ = false;
    host_impl_->active_tree()->SetPendingPageScaleAnimation(
        scoped_ptr<PendingPageScaleAnimation> (new PendingPageScaleAnimation(
            gfx::Vector2d(25, 25),
            true,
            min_page_scale,
            duration)));
    host_impl_->ActivateSyncTree();
    EXPECT_FALSE(did_request_redraw_);
    EXPECT_TRUE(did_request_animate_);

    did_request_redraw_ = false;
    did_request_animate_ = false;
    host_impl_->Animate(start_time);
    EXPECT_TRUE(did_request_redraw_);
    EXPECT_TRUE(did_request_animate_);

    did_request_redraw_ = false;
    did_request_commit_ = false;
    did_request_animate_ = false;
    host_impl_->Animate(end_time);
    EXPECT_TRUE(did_request_redraw_);
    EXPECT_FALSE(did_request_animate_);
    EXPECT_TRUE(did_request_commit_);

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, min_page_scale);
    // Pushed to (0,0) via clamping against contents layer size.
    ExpectContains(*scroll_info, scroll_layer->id(), gfx::Vector2d(-50, -50));
  }
}

TEST_F(LayerTreeHostImplTest, PageScaleAnimationNoOp) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  LayerImpl* scroll_layer = host_impl_->InnerViewportScrollLayer();
  DCHECK(scroll_layer);

  float min_page_scale = 0.5f;
  float max_page_scale = 4.f;
  base::TimeTicks start_time = base::TimeTicks() +
                               base::TimeDelta::FromSeconds(1);
  base::TimeDelta duration = base::TimeDelta::FromMilliseconds(100);
  base::TimeTicks halfway_through_animation = start_time + duration / 2;
  base::TimeTicks end_time = start_time + duration;

  // Anchor zoom with unchanged page scale should not change scroll or scale.
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                           max_page_scale);
    scroll_layer->SetScrollOffset(gfx::ScrollOffset(50, 50));

    host_impl_->active_tree()->SetPendingPageScaleAnimation(
        scoped_ptr<PendingPageScaleAnimation>(new PendingPageScaleAnimation(
            gfx::Vector2d(),
            true,
            1.f,
            duration)));
    host_impl_->ActivateSyncTree();
    host_impl_->Animate(start_time);
    host_impl_->Animate(halfway_through_animation);
    EXPECT_TRUE(did_request_redraw_);
    host_impl_->Animate(end_time);
    EXPECT_TRUE(did_request_commit_);

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    EXPECT_EQ(scroll_info->page_scale_delta, 1);
    ExpectNone(*scroll_info, scroll_layer->id());
  }
}

TEST_F(LayerTreeHostImplTest, PageScaleAnimationTransferedOnSyncTreeActivate) {
  host_impl_->CreatePendingTree();
  CreateScrollAndContentsLayers(
      host_impl_->pending_tree(),
      gfx::Size(100, 100));
  host_impl_->ActivateSyncTree();
  DrawFrame();

  LayerImpl* scroll_layer = host_impl_->InnerViewportScrollLayer();
  DCHECK(scroll_layer);

  float min_page_scale = 0.5f;
  float max_page_scale = 4.f;
  host_impl_->sync_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                       max_page_scale);
  host_impl_->ActivateSyncTree();

  base::TimeTicks start_time = base::TimeTicks() +
                               base::TimeDelta::FromSeconds(1);
  base::TimeDelta duration = base::TimeDelta::FromMilliseconds(100);
  base::TimeTicks third_through_animation = start_time + duration / 3;
  base::TimeTicks halfway_through_animation = start_time + duration / 2;
  base::TimeTicks end_time = start_time + duration;
  float target_scale = 2.f;

  scroll_layer->SetScrollOffset(gfx::ScrollOffset(50, 50));

  // Make sure TakePageScaleAnimation works properly.

  host_impl_->sync_tree()->SetPendingPageScaleAnimation(
      scoped_ptr<PendingPageScaleAnimation>(new PendingPageScaleAnimation(
          gfx::Vector2d(),
          false,
          target_scale,
          duration)));
  scoped_ptr<PendingPageScaleAnimation> psa =
      host_impl_->sync_tree()->TakePendingPageScaleAnimation();
  EXPECT_EQ(target_scale, psa->scale);
  EXPECT_EQ(duration, psa->duration);
  EXPECT_EQ(nullptr, host_impl_->sync_tree()->TakePendingPageScaleAnimation());

  // Recreate the PSA. Nothing should happen here since the tree containing the
  // PSA hasn't been activated yet.
  did_request_redraw_ = false;
  did_request_animate_ = false;
  host_impl_->sync_tree()->SetPendingPageScaleAnimation(
      scoped_ptr<PendingPageScaleAnimation>(new PendingPageScaleAnimation(
          gfx::Vector2d(),
          false,
          target_scale,
          duration)));
  host_impl_->Animate(halfway_through_animation);
  EXPECT_FALSE(did_request_animate_);
  EXPECT_FALSE(did_request_redraw_);

  // Activate the sync tree. This should cause the animation to become enabled.
  // It should also clear the pointer on the sync tree.
  host_impl_->ActivateSyncTree();
  EXPECT_EQ(nullptr,
      host_impl_->sync_tree()->TakePendingPageScaleAnimation().get());
  EXPECT_FALSE(did_request_redraw_);
  EXPECT_TRUE(did_request_animate_);

  // From here on, make sure the animation runs as normal.
  did_request_redraw_ = false;
  did_request_animate_ = false;
  host_impl_->Animate(start_time);
  EXPECT_TRUE(did_request_redraw_);
  EXPECT_TRUE(did_request_animate_);

  did_request_redraw_ = false;
  did_request_animate_ = false;
  host_impl_->Animate(third_through_animation);
  EXPECT_TRUE(did_request_redraw_);
  EXPECT_TRUE(did_request_animate_);

  // Another activation shouldn't have any effect on the animation.
  host_impl_->ActivateSyncTree();

  did_request_redraw_ = false;
  did_request_animate_ = false;
  host_impl_->Animate(halfway_through_animation);
  EXPECT_TRUE(did_request_redraw_);
  EXPECT_TRUE(did_request_animate_);

  did_request_redraw_ = false;
  did_request_animate_ = false;
  did_request_commit_ = false;
  host_impl_->Animate(end_time);
  EXPECT_TRUE(did_request_commit_);
  EXPECT_FALSE(did_request_animate_);

  scoped_ptr<ScrollAndScaleSet> scroll_info =
      host_impl_->ProcessScrollDeltas();
  EXPECT_EQ(scroll_info->page_scale_delta, target_scale);
  ExpectContains(*scroll_info, scroll_layer->id(), gfx::Vector2d(-50, -50));
}

TEST_F(LayerTreeHostImplTest, PageScaleAnimationCompletedNotification) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  LayerImpl* scroll_layer = host_impl_->InnerViewportScrollLayer();
  DCHECK(scroll_layer);

  base::TimeTicks start_time =
      base::TimeTicks() + base::TimeDelta::FromSeconds(1);
  base::TimeDelta duration = base::TimeDelta::FromMilliseconds(100);
  base::TimeTicks halfway_through_animation = start_time + duration / 2;
  base::TimeTicks end_time = start_time + duration;

  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
  scroll_layer->SetScrollOffset(gfx::ScrollOffset(50, 50));

  did_complete_page_scale_animation_ = false;
  host_impl_->active_tree()->SetPendingPageScaleAnimation(
      scoped_ptr<PendingPageScaleAnimation>(new PendingPageScaleAnimation(
          gfx::Vector2d(), false, 2.f, duration)));
  host_impl_->ActivateSyncTree();
  host_impl_->Animate(start_time);
  EXPECT_FALSE(did_complete_page_scale_animation_);

  host_impl_->Animate(halfway_through_animation);
  EXPECT_FALSE(did_complete_page_scale_animation_);

  host_impl_->Animate(end_time);
  EXPECT_TRUE(did_complete_page_scale_animation_);
}

class LayerTreeHostImplOverridePhysicalTime : public LayerTreeHostImpl {
 public:
  LayerTreeHostImplOverridePhysicalTime(
      const LayerTreeSettings& settings,
      LayerTreeHostImplClient* client,
      Proxy* proxy,
      SharedBitmapManager* manager,
      RenderingStatsInstrumentation* rendering_stats_instrumentation)
      : LayerTreeHostImpl(settings,
                          client,
                          proxy,
                          rendering_stats_instrumentation,
                          manager,
                          NULL,
                          0) {}

  BeginFrameArgs CurrentBeginFrameArgs() const override {
    return CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE,
                                          fake_current_physical_time_);
  }

  void SetCurrentPhysicalTimeTicksForTest(base::TimeTicks fake_now) {
    fake_current_physical_time_ = fake_now;
  }

 private:
  base::TimeTicks fake_current_physical_time_;
};

#define SETUP_LAYERS_FOR_SCROLLBAR_ANIMATION_TEST()                            \
  gfx::Size viewport_size(10, 10);                                             \
  gfx::Size content_size(100, 100);                                            \
                                                                               \
  LayerTreeHostImplOverridePhysicalTime* host_impl_override_time =             \
      new LayerTreeHostImplOverridePhysicalTime(settings, this, &proxy_,       \
                                                shared_bitmap_manager_.get(),  \
                                                &stats_instrumentation_);      \
  host_impl_ = make_scoped_ptr(host_impl_override_time);                       \
  host_impl_->InitializeRenderer(CreateOutputSurface());                       \
  host_impl_->SetViewportSize(viewport_size);                                  \
                                                                               \
  scoped_ptr<LayerImpl> root =                                                 \
      LayerImpl::Create(host_impl_->active_tree(), 1);                         \
  root->SetBounds(viewport_size);                                              \
                                                                               \
  scoped_ptr<LayerImpl> scroll =                                               \
      LayerImpl::Create(host_impl_->active_tree(), 2);                         \
  scroll->SetScrollClipLayer(root->id());                                      \
  scroll->SetScrollOffset(gfx::ScrollOffset());                                \
  root->SetBounds(viewport_size);                                              \
  scroll->SetBounds(content_size);                                             \
  scroll->SetContentBounds(content_size);                                      \
  scroll->SetIsContainerForFixedPositionLayers(true);                          \
                                                                               \
  scoped_ptr<LayerImpl> contents =                                             \
      LayerImpl::Create(host_impl_->active_tree(), 3);                         \
  contents->SetDrawsContent(true);                                             \
  contents->SetBounds(content_size);                                           \
  contents->SetContentBounds(content_size);                                    \
                                                                               \
  scoped_ptr<SolidColorScrollbarLayerImpl> scrollbar =                         \
      SolidColorScrollbarLayerImpl::Create(host_impl_->active_tree(), 4,       \
                                           VERTICAL, 10, 0, false, true);      \
  EXPECT_FLOAT_EQ(0.f, scrollbar->opacity());                                  \
                                                                               \
  scroll->AddChild(contents.Pass());                                           \
  root->AddChild(scroll.Pass());                                               \
  root->SetHasRenderSurface(true);                                             \
  scrollbar->SetScrollLayerAndClipLayerByIds(2, 1);                            \
  root->AddChild(scrollbar.Pass());                                            \
                                                                               \
  host_impl_->active_tree()->SetRootLayer(root.Pass());                        \
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 2, \
                                                      Layer::INVALID_ID);      \
  host_impl_->active_tree()->DidBecomeActive();                                \
  DrawFrame();

TEST_F(LayerTreeHostImplTest, ScrollbarLinearFadeScheduling) {
  LayerTreeSettings settings;
  settings.scrollbar_animator = LayerTreeSettings::LinearFade;
  settings.scrollbar_fade_delay_ms = 20;
  settings.scrollbar_fade_duration_ms = 20;

  SETUP_LAYERS_FOR_SCROLLBAR_ANIMATION_TEST();

  base::TimeTicks fake_now = gfx::FrameTime::Now();

  EXPECT_EQ(base::TimeDelta(), requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_redraw_);

  // If no scroll happened during a scroll gesture, it should have no effect.
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel);
  host_impl_->ScrollEnd();
  EXPECT_EQ(base::TimeDelta(), requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_redraw_);
  EXPECT_TRUE(scrollbar_fade_start_.Equals(base::Closure()));

  // After a scroll, a fade animation should be scheduled about 20ms from now.
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel);
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0, 5));
  host_impl_->ScrollEnd();
  did_request_redraw_ = false;
  did_request_animate_ = false;
  EXPECT_LT(base::TimeDelta::FromMilliseconds(19),
            requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_redraw_);
  EXPECT_FALSE(did_request_animate_);
  requested_scrollbar_animation_delay_ = base::TimeDelta();
  scrollbar_fade_start_.Run();
  host_impl_->Animate(fake_now);

  // After the fade begins, we should start getting redraws instead of a
  // scheduled animation.
  fake_now += base::TimeDelta::FromMilliseconds(25);
  EXPECT_EQ(base::TimeDelta(), requested_scrollbar_animation_delay_);
  EXPECT_TRUE(did_request_animate_);
  did_request_animate_ = false;

  // Setting the scroll offset outside a scroll should also cause the scrollbar
  // to appear and to schedule a fade.
  host_impl_->InnerViewportScrollLayer()->SetScrollOffset(
      gfx::ScrollOffset(5, 5));
  EXPECT_LT(base::TimeDelta::FromMilliseconds(19),
            requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_redraw_);
  EXPECT_FALSE(did_request_animate_);
  requested_scrollbar_animation_delay_ = base::TimeDelta();

  // Unnecessarily Fade animation of solid color scrollbar is not triggered.
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel);
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(5, 0));
  host_impl_->ScrollEnd();
  EXPECT_EQ(base::TimeDelta(), requested_scrollbar_animation_delay_);
}

TEST_F(LayerTreeHostImplTest, ScrollbarFadePinchZoomScrollbars) {
  LayerTreeSettings settings;
  settings.scrollbar_animator = LayerTreeSettings::LinearFade;
  settings.scrollbar_fade_delay_ms = 20;
  settings.scrollbar_fade_duration_ms = 20;
  settings.use_pinch_zoom_scrollbars = true;

  SETUP_LAYERS_FOR_SCROLLBAR_ANIMATION_TEST();

  base::TimeTicks fake_now = gfx::FrameTime::Now();

  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 1.f, 4.f);

  EXPECT_EQ(base::TimeDelta(), requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_animate_);

  // If no scroll happened during a scroll gesture, it should have no effect.
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel);
  host_impl_->ScrollEnd();
  EXPECT_EQ(base::TimeDelta(), requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_animate_);
  EXPECT_TRUE(scrollbar_fade_start_.Equals(base::Closure()));

  // After a scroll, no fade animation should be scheduled.
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel);
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(5, 0));
  host_impl_->ScrollEnd();
  did_request_redraw_ = false;
  EXPECT_EQ(base::TimeDelta(), requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_animate_);
  requested_scrollbar_animation_delay_ = base::TimeDelta();

  // We should not see any draw requests.
  fake_now += base::TimeDelta::FromMilliseconds(25);
  EXPECT_EQ(base::TimeDelta(), requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_animate_);

  // Make page scale > min so that subsequent scrolls will trigger fades.
  host_impl_->SetPageScaleOnActiveTree(1.1f);

  // After a scroll, a fade animation should be scheduled about 20ms from now.
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel);
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(5, 0));
  host_impl_->ScrollEnd();
  did_request_redraw_ = false;
  EXPECT_LT(base::TimeDelta::FromMilliseconds(19),
            requested_scrollbar_animation_delay_);
  EXPECT_FALSE(did_request_animate_);
  requested_scrollbar_animation_delay_ = base::TimeDelta();
  scrollbar_fade_start_.Run();

  // After the fade begins, we should start getting redraws instead of a
  // scheduled animation.
  fake_now += base::TimeDelta::FromMilliseconds(25);
  host_impl_->Animate(fake_now);
  EXPECT_TRUE(did_request_animate_);
}

void LayerTreeHostImplTest::SetupMouseMoveAtWithDeviceScale(
    float device_scale_factor) {
  LayerTreeSettings settings;
  settings.scrollbar_fade_delay_ms = 500;
  settings.scrollbar_fade_duration_ms = 300;
  settings.scrollbar_animator = LayerTreeSettings::Thinning;

  gfx::Size viewport_size(300, 200);
  gfx::Size device_viewport_size = gfx::ToFlooredSize(
      gfx::ScaleSize(viewport_size, device_scale_factor));
  gfx::Size content_size(1000, 1000);

  CreateHostImpl(settings, CreateOutputSurface());
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  host_impl_->SetViewportSize(device_viewport_size);

  scoped_ptr<LayerImpl> root =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetBounds(viewport_size);
  root->SetHasRenderSurface(true);

  scoped_ptr<LayerImpl> scroll =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  scroll->SetScrollClipLayer(root->id());
  scroll->SetScrollOffset(gfx::ScrollOffset());
  scroll->SetBounds(content_size);
  scroll->SetContentBounds(content_size);
  scroll->SetIsContainerForFixedPositionLayers(true);

  scoped_ptr<LayerImpl> contents =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  contents->SetDrawsContent(true);
  contents->SetBounds(content_size);
  contents->SetContentBounds(content_size);

  // The scrollbar is on the right side.
  scoped_ptr<PaintedScrollbarLayerImpl> scrollbar =
      PaintedScrollbarLayerImpl::Create(host_impl_->active_tree(), 5, VERTICAL);
  scrollbar->SetDrawsContent(true);
  scrollbar->SetBounds(gfx::Size(15, viewport_size.height()));
  scrollbar->SetContentBounds(gfx::Size(15, viewport_size.height()));
  scrollbar->SetPosition(gfx::Point(285, 0));

  scroll->AddChild(contents.Pass());
  root->AddChild(scroll.Pass());
  scrollbar->SetScrollLayerAndClipLayerByIds(2, 1);
  root->AddChild(scrollbar.Pass());

  host_impl_->active_tree()->SetRootLayer(root.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 2,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  DrawFrame();

  LayerImpl* root_scroll =
      host_impl_->active_tree()->InnerViewportScrollLayer();
  ASSERT_TRUE(root_scroll->scrollbar_animation_controller());
  ScrollbarAnimationControllerThinning* scrollbar_animation_controller =
      static_cast<ScrollbarAnimationControllerThinning*>(
          root_scroll->scrollbar_animation_controller());
  scrollbar_animation_controller->set_mouse_move_distance_for_test(100.f);

  host_impl_->MouseMoveAt(gfx::Point(1, 1));
  EXPECT_FALSE(scrollbar_animation_controller->mouse_is_near_scrollbar());

  host_impl_->MouseMoveAt(gfx::Point(200, 50));
  EXPECT_TRUE(scrollbar_animation_controller->mouse_is_near_scrollbar());

  host_impl_->MouseMoveAt(gfx::Point(184, 100));
  EXPECT_FALSE(scrollbar_animation_controller->mouse_is_near_scrollbar());

  scrollbar_animation_controller->set_mouse_move_distance_for_test(102.f);
  host_impl_->MouseMoveAt(gfx::Point(184, 100));
  EXPECT_TRUE(scrollbar_animation_controller->mouse_is_near_scrollbar());

  did_request_redraw_ = false;
  EXPECT_EQ(0, host_impl_->scroll_layer_id_when_mouse_over_scrollbar());
  host_impl_->MouseMoveAt(gfx::Point(290, 100));
  EXPECT_EQ(2, host_impl_->scroll_layer_id_when_mouse_over_scrollbar());
  host_impl_->MouseMoveAt(gfx::Point(290, 120));
  EXPECT_EQ(2, host_impl_->scroll_layer_id_when_mouse_over_scrollbar());
  host_impl_->MouseMoveAt(gfx::Point(150, 120));
  EXPECT_EQ(0, host_impl_->scroll_layer_id_when_mouse_over_scrollbar());
}

TEST_F(LayerTreeHostImplTest, MouseMoveAtWithDeviceScaleOf1) {
  SetupMouseMoveAtWithDeviceScale(1.f);
}

TEST_F(LayerTreeHostImplTest, MouseMoveAtWithDeviceScaleOf2) {
  SetupMouseMoveAtWithDeviceScale(2.f);
}

TEST_F(LayerTreeHostImplTest, CompositorFrameMetadata) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
  DrawFrame();
  {
    CompositorFrameMetadata metadata =
        host_impl_->MakeCompositorFrameMetadata();
    EXPECT_EQ(gfx::Vector2dF(), metadata.root_scroll_offset);
    EXPECT_EQ(1.f, metadata.page_scale_factor);
    EXPECT_EQ(gfx::SizeF(50.f, 50.f), metadata.scrollable_viewport_size);
    EXPECT_EQ(gfx::SizeF(100.f, 100.f), metadata.root_layer_size);
    EXPECT_EQ(0.5f, metadata.min_page_scale_factor);
    EXPECT_EQ(4.f, metadata.max_page_scale_factor);
  }

  // Scrolling should update metadata immediately.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  {
    CompositorFrameMetadata metadata =
        host_impl_->MakeCompositorFrameMetadata();
    EXPECT_EQ(gfx::Vector2dF(0.f, 10.f), metadata.root_scroll_offset);
  }
  host_impl_->ScrollEnd();
  {
    CompositorFrameMetadata metadata =
        host_impl_->MakeCompositorFrameMetadata();
    EXPECT_EQ(gfx::Vector2dF(0.f, 10.f), metadata.root_scroll_offset);
  }

  // Page scale should update metadata correctly (shrinking only the viewport).
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
  host_impl_->PinchGestureBegin();
  host_impl_->PinchGestureUpdate(2.f, gfx::Point());
  host_impl_->PinchGestureEnd();
  host_impl_->ScrollEnd();
  {
    CompositorFrameMetadata metadata =
        host_impl_->MakeCompositorFrameMetadata();
    EXPECT_EQ(gfx::Vector2dF(0.f, 10.f), metadata.root_scroll_offset);
    EXPECT_EQ(2.f, metadata.page_scale_factor);
    EXPECT_EQ(gfx::SizeF(25.f, 25.f), metadata.scrollable_viewport_size);
    EXPECT_EQ(gfx::SizeF(100.f, 100.f), metadata.root_layer_size);
    EXPECT_EQ(0.5f, metadata.min_page_scale_factor);
    EXPECT_EQ(4.f, metadata.max_page_scale_factor);
  }

  // Likewise if set from the main thread.
  host_impl_->ProcessScrollDeltas();
  host_impl_->active_tree()->PushPageScaleFromMainThread(4.f, 0.5f, 4.f);
  host_impl_->SetPageScaleOnActiveTree(4.f);
  {
    CompositorFrameMetadata metadata =
        host_impl_->MakeCompositorFrameMetadata();
    EXPECT_EQ(gfx::Vector2dF(0.f, 10.f), metadata.root_scroll_offset);
    EXPECT_EQ(4.f, metadata.page_scale_factor);
    EXPECT_EQ(gfx::SizeF(12.5f, 12.5f), metadata.scrollable_viewport_size);
    EXPECT_EQ(gfx::SizeF(100.f, 100.f), metadata.root_layer_size);
    EXPECT_EQ(0.5f, metadata.min_page_scale_factor);
    EXPECT_EQ(4.f, metadata.max_page_scale_factor);
  }
}

class DidDrawCheckLayer : public LayerImpl {
 public:
  static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
    return make_scoped_ptr(new DidDrawCheckLayer(tree_impl, id));
  }

  bool WillDraw(DrawMode draw_mode, ResourceProvider* provider) override {
    will_draw_called_ = true;
    if (will_draw_returns_false_)
      return false;
    return LayerImpl::WillDraw(draw_mode, provider);
  }

  void AppendQuads(RenderPass* render_pass,
                   const Occlusion& occlusion_in_content_space,
                   AppendQuadsData* append_quads_data) override {
    append_quads_called_ = true;
    LayerImpl::AppendQuads(
        render_pass, occlusion_in_content_space, append_quads_data);
  }

  void DidDraw(ResourceProvider* provider) override {
    did_draw_called_ = true;
    LayerImpl::DidDraw(provider);
  }

  bool will_draw_called() const { return will_draw_called_; }
  bool append_quads_called() const { return append_quads_called_; }
  bool did_draw_called() const { return did_draw_called_; }

  void set_will_draw_returns_false() { will_draw_returns_false_ = true; }

  void ClearDidDrawCheck() {
    will_draw_called_ = false;
    append_quads_called_ = false;
    did_draw_called_ = false;
  }

 protected:
  DidDrawCheckLayer(LayerTreeImpl* tree_impl, int id)
      : LayerImpl(tree_impl, id),
        will_draw_returns_false_(false),
        will_draw_called_(false),
        append_quads_called_(false),
        did_draw_called_(false) {
    SetBounds(gfx::Size(10, 10));
    SetContentBounds(gfx::Size(10, 10));
    SetDrawsContent(true);
    draw_properties().visible_content_rect = gfx::Rect(0, 0, 10, 10);
  }

 private:
  bool will_draw_returns_false_;
  bool will_draw_called_;
  bool append_quads_called_;
  bool did_draw_called_;
};

TEST_F(LayerTreeHostImplTest, WillDrawReturningFalseDoesNotCall) {
  // The root layer is always drawn, so run this test on a child layer that
  // will be masked out by the root layer's bounds.
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
  DidDrawCheckLayer* root = static_cast<DidDrawCheckLayer*>(
      host_impl_->active_tree()->root_layer());

  root->AddChild(DidDrawCheckLayer::Create(host_impl_->active_tree(), 2));
  root->SetHasRenderSurface(true);
  DidDrawCheckLayer* layer =
      static_cast<DidDrawCheckLayer*>(root->children()[0]);

  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);

    EXPECT_TRUE(layer->will_draw_called());
    EXPECT_TRUE(layer->append_quads_called());
    EXPECT_TRUE(layer->did_draw_called());
  }

  host_impl_->SetViewportDamage(gfx::Rect(10, 10));

  {
    LayerTreeHostImpl::FrameData frame;

    layer->set_will_draw_returns_false();
    layer->ClearDidDrawCheck();

    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);

    EXPECT_TRUE(layer->will_draw_called());
    EXPECT_FALSE(layer->append_quads_called());
    EXPECT_FALSE(layer->did_draw_called());
  }
}

TEST_F(LayerTreeHostImplTest, DidDrawNotCalledOnHiddenLayer) {
  // The root layer is always drawn, so run this test on a child layer that
  // will be masked out by the root layer's bounds.
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
  DidDrawCheckLayer* root = static_cast<DidDrawCheckLayer*>(
      host_impl_->active_tree()->root_layer());
  root->SetMasksToBounds(true);
  root->SetHasRenderSurface(true);
  root->AddChild(DidDrawCheckLayer::Create(host_impl_->active_tree(), 2));
  DidDrawCheckLayer* layer =
      static_cast<DidDrawCheckLayer*>(root->children()[0]);
  // Ensure visible_content_rect for layer is empty.
  layer->SetPosition(gfx::PointF(100.f, 100.f));
  layer->SetBounds(gfx::Size(10, 10));
  layer->SetContentBounds(gfx::Size(10, 10));

  LayerTreeHostImpl::FrameData frame;

  EXPECT_FALSE(layer->will_draw_called());
  EXPECT_FALSE(layer->did_draw_called());

  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);

  EXPECT_FALSE(layer->will_draw_called());
  EXPECT_FALSE(layer->did_draw_called());

  EXPECT_TRUE(layer->visible_content_rect().IsEmpty());

  // Ensure visible_content_rect for layer is not empty
  layer->SetPosition(gfx::PointF());

  EXPECT_FALSE(layer->will_draw_called());
  EXPECT_FALSE(layer->did_draw_called());

  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);

  EXPECT_TRUE(layer->will_draw_called());
  EXPECT_TRUE(layer->did_draw_called());

  EXPECT_FALSE(layer->visible_content_rect().IsEmpty());
}

TEST_F(LayerTreeHostImplTest, WillDrawNotCalledOnOccludedLayer) {
  gfx::Size big_size(1000, 1000);
  host_impl_->SetViewportSize(big_size);

  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());

  root->AddChild(DidDrawCheckLayer::Create(host_impl_->active_tree(), 2));
  DidDrawCheckLayer* occluded_layer =
      static_cast<DidDrawCheckLayer*>(root->children()[0]);

  root->AddChild(DidDrawCheckLayer::Create(host_impl_->active_tree(), 3));
  root->SetHasRenderSurface(true);
  DidDrawCheckLayer* top_layer =
      static_cast<DidDrawCheckLayer*>(root->children()[1]);
  // This layer covers the occluded_layer above. Make this layer large so it can
  // occlude.
  top_layer->SetBounds(big_size);
  top_layer->SetContentBounds(big_size);
  top_layer->SetContentsOpaque(true);

  LayerTreeHostImpl::FrameData frame;

  EXPECT_FALSE(occluded_layer->will_draw_called());
  EXPECT_FALSE(occluded_layer->did_draw_called());
  EXPECT_FALSE(top_layer->will_draw_called());
  EXPECT_FALSE(top_layer->did_draw_called());

  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);

  EXPECT_FALSE(occluded_layer->will_draw_called());
  EXPECT_FALSE(occluded_layer->did_draw_called());
  EXPECT_TRUE(top_layer->will_draw_called());
  EXPECT_TRUE(top_layer->did_draw_called());
}

TEST_F(LayerTreeHostImplTest, DidDrawCalledOnAllLayers) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());

  root->AddChild(DidDrawCheckLayer::Create(host_impl_->active_tree(), 2));
  root->SetHasRenderSurface(true);
  DidDrawCheckLayer* layer1 =
      static_cast<DidDrawCheckLayer*>(root->children()[0]);

  layer1->AddChild(DidDrawCheckLayer::Create(host_impl_->active_tree(), 3));
  DidDrawCheckLayer* layer2 =
      static_cast<DidDrawCheckLayer*>(layer1->children()[0]);

  layer1->SetHasRenderSurface(true);
  layer1->SetShouldFlattenTransform(true);

  EXPECT_FALSE(root->did_draw_called());
  EXPECT_FALSE(layer1->did_draw_called());
  EXPECT_FALSE(layer2->did_draw_called());

  LayerTreeHostImpl::FrameData frame;
  FakeLayerTreeHostImpl::RecursiveUpdateNumChildren(
      host_impl_->active_tree()->root_layer());
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);

  EXPECT_TRUE(root->did_draw_called());
  EXPECT_TRUE(layer1->did_draw_called());
  EXPECT_TRUE(layer2->did_draw_called());

  EXPECT_NE(root->render_surface(), layer1->render_surface());
  EXPECT_TRUE(!!layer1->render_surface());
}

class MissingTextureAnimatingLayer : public DidDrawCheckLayer {
 public:
  static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl,
                                      int id,
                                      bool tile_missing,
                                      bool had_incomplete_tile,
                                      bool animating,
                                      ResourceProvider* resource_provider) {
    return make_scoped_ptr(new MissingTextureAnimatingLayer(tree_impl,
                                                            id,
                                                            tile_missing,
                                                            had_incomplete_tile,
                                                            animating,
                                                            resource_provider));
  }

  void AppendQuads(RenderPass* render_pass,
                   const Occlusion& occlusion_in_content_space,
                   AppendQuadsData* append_quads_data) override {
    LayerImpl::AppendQuads(
        render_pass, occlusion_in_content_space, append_quads_data);
    if (had_incomplete_tile_)
      append_quads_data->num_incomplete_tiles++;
    if (tile_missing_)
      append_quads_data->num_missing_tiles++;
  }

 private:
  MissingTextureAnimatingLayer(LayerTreeImpl* tree_impl,
                               int id,
                               bool tile_missing,
                               bool had_incomplete_tile,
                               bool animating,
                               ResourceProvider* resource_provider)
      : DidDrawCheckLayer(tree_impl, id),
        tile_missing_(tile_missing),
        had_incomplete_tile_(had_incomplete_tile) {
    if (animating)
      AddAnimatedTransformToLayer(this, 10.0, 3, 0);
  }

  bool tile_missing_;
  bool had_incomplete_tile_;
};

TEST_F(LayerTreeHostImplTest, PrepareToDrawSucceedsOnDefault) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);
  bool tile_missing = false;
  bool had_incomplete_tile = false;
  bool is_animating = false;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           2,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));

  LayerTreeHostImpl::FrameData frame;

  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
}

TEST_F(LayerTreeHostImplTest, PrepareToDrawSucceedsWithAnimatedLayer) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);
  bool tile_missing = false;
  bool had_incomplete_tile = false;
  bool is_animating = true;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           2,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));

  LayerTreeHostImpl::FrameData frame;

  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
}

TEST_F(LayerTreeHostImplTest, PrepareToDrawSucceedsWithMissingTiles) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 3));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  host_impl_->SwapBuffers(frame);

  bool tile_missing = true;
  bool had_incomplete_tile = false;
  bool is_animating = false;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           4,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));
  LayerTreeHostImpl::FrameData frame2;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame2));
  host_impl_->DrawLayers(&frame2, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame2);
}

TEST_F(LayerTreeHostImplTest, PrepareToDrawSucceedsWithIncompleteTile) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 3));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  host_impl_->SwapBuffers(frame);

  bool tile_missing = false;
  bool had_incomplete_tile = true;
  bool is_animating = false;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           4,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));
  LayerTreeHostImpl::FrameData frame2;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame2));
  host_impl_->DrawLayers(&frame2, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame2);
}

TEST_F(LayerTreeHostImplTest,
       PrepareToDrawFailsWithAnimationAndMissingTilesUsesCheckerboard) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 5));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  host_impl_->SwapBuffers(frame);

  bool tile_missing = true;
  bool had_incomplete_tile = false;
  bool is_animating = true;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           6,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));
  LayerTreeHostImpl::FrameData frame2;
  EXPECT_EQ(DRAW_ABORTED_CHECKERBOARD_ANIMATIONS,
            host_impl_->PrepareToDraw(&frame2));
  host_impl_->DrawLayers(&frame2, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame2);
}

TEST_F(LayerTreeHostImplTest,
       PrepareToDrawSucceedsWithAnimationAndIncompleteTiles) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 5));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  host_impl_->SwapBuffers(frame);

  bool tile_missing = false;
  bool had_incomplete_tile = true;
  bool is_animating = true;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           6,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));
  LayerTreeHostImpl::FrameData frame2;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame2));
  host_impl_->DrawLayers(&frame2, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame2);
}

TEST_F(LayerTreeHostImplTest, PrepareToDrawSucceedsWhenHighResRequired) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 7));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  host_impl_->SwapBuffers(frame);

  bool tile_missing = false;
  bool had_incomplete_tile = false;
  bool is_animating = false;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           8,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));
  host_impl_->SetRequiresHighResToDraw();
  LayerTreeHostImpl::FrameData frame2;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame2));
  host_impl_->DrawLayers(&frame2, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame2);
}

TEST_F(LayerTreeHostImplTest,
       PrepareToDrawFailsWhenHighResRequiredAndIncompleteTiles) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 7));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  host_impl_->SwapBuffers(frame);

  bool tile_missing = false;
  bool had_incomplete_tile = true;
  bool is_animating = false;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           8,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));
  host_impl_->SetRequiresHighResToDraw();
  LayerTreeHostImpl::FrameData frame2;
  EXPECT_EQ(DRAW_ABORTED_MISSING_HIGH_RES_CONTENT,
            host_impl_->PrepareToDraw(&frame2));
  host_impl_->DrawLayers(&frame2, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame2);
}

TEST_F(LayerTreeHostImplTest,
       PrepareToDrawFailsWhenHighResRequiredAndMissingTile) {
  host_impl_->active_tree()->SetRootLayer(
      DidDrawCheckLayer::Create(host_impl_->active_tree(), 7));
  DidDrawCheckLayer* root =
      static_cast<DidDrawCheckLayer*>(host_impl_->active_tree()->root_layer());
  root->SetHasRenderSurface(true);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  host_impl_->SwapBuffers(frame);

  bool tile_missing = true;
  bool had_incomplete_tile = false;
  bool is_animating = false;
  root->AddChild(
      MissingTextureAnimatingLayer::Create(host_impl_->active_tree(),
                                           8,
                                           tile_missing,
                                           had_incomplete_tile,
                                           is_animating,
                                           host_impl_->resource_provider()));
  host_impl_->SetRequiresHighResToDraw();
  LayerTreeHostImpl::FrameData frame2;
  EXPECT_EQ(DRAW_ABORTED_MISSING_HIGH_RES_CONTENT,
            host_impl_->PrepareToDraw(&frame2));
  host_impl_->DrawLayers(&frame2, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame2);
}

TEST_F(LayerTreeHostImplTest, ScrollRootIgnored) {
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetScrollClipLayer(Layer::INVALID_ID);
  root->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  DrawFrame();

  // Scroll event is ignored because layer is not scrollable.
  EXPECT_EQ(InputHandler::ScrollIgnored,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  EXPECT_FALSE(did_request_redraw_);
  EXPECT_FALSE(did_request_commit_);
}

// TODO(bokan): Convert these tests to create inner and outer viewports.
class LayerTreeHostImplTopControlsTest : public LayerTreeHostImplTest {
 public:
  LayerTreeHostImplTopControlsTest()
      // Make the clip size the same as the layer (content) size so the layer is
      // non-scrollable.
      : layer_size_(10, 10),
        clip_size_(layer_size_),
        top_controls_height_(50) {
    settings_.calculate_top_controls_position = true;
    settings_.use_pinch_virtual_viewport = true;

    viewport_size_ = gfx::Size(clip_size_.width(),
                               clip_size_.height() + top_controls_height_);
  }

  bool CreateHostImpl(const LayerTreeSettings& settings,
                      scoped_ptr<OutputSurface> output_surface) override {
    bool init =
        LayerTreeHostImplTest::CreateHostImpl(settings, output_surface.Pass());
    if (init && settings.calculate_top_controls_position) {
      host_impl_->active_tree()->set_top_controls_height(top_controls_height_);
      host_impl_->active_tree()->set_top_controls_delta(top_controls_height_);
      host_impl_->top_controls_manager()->SetTopControlsHeight(
          top_controls_height_);
      host_impl_->DidChangeTopControlsPosition();
    }
    return init;
  }

  void SetupTopControlsAndScrollLayer() {
    scoped_ptr<LayerImpl> root =
        LayerImpl::Create(host_impl_->active_tree(), 1);
    scoped_ptr<LayerImpl> root_clip =
        LayerImpl::Create(host_impl_->active_tree(), 2);
    root_clip->SetBounds(clip_size_);
    root->SetScrollClipLayer(root_clip->id());
    root->SetBounds(layer_size_);
    root->SetContentBounds(layer_size_);
    root->SetPosition(gfx::PointF());
    root->SetDrawsContent(false);
    root->SetIsContainerForFixedPositionLayers(true);
    int inner_viewport_scroll_layer_id = root->id();
    int page_scale_layer_id = root_clip->id();
    root_clip->SetHasRenderSurface(true);
    root_clip->AddChild(root.Pass());
    root_clip->SetHasRenderSurface(true);
    host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
    host_impl_->active_tree()->SetViewportLayersFromIds(
        Layer::INVALID_ID, page_scale_layer_id, inner_viewport_scroll_layer_id,
        Layer::INVALID_ID);
    // Set a viewport size that is large enough to contain both the top controls
    // and some content.
    host_impl_->SetViewportSize(viewport_size_);
    host_impl_->sync_tree()->set_top_controls_shrink_blink_size(true);

    host_impl_->DidChangeTopControlsPosition();

    host_impl_->CreatePendingTree();
    root =
        LayerImpl::Create(host_impl_->sync_tree(), 1);
    root_clip =
        LayerImpl::Create(host_impl_->sync_tree(), 2);
    root_clip->SetBounds(clip_size_);
    root->SetScrollClipLayer(root_clip->id());
    root->SetBounds(layer_size_);
    root->SetContentBounds(layer_size_);
    root->SetPosition(gfx::PointF());
    root->SetDrawsContent(false);
    root->SetIsContainerForFixedPositionLayers(true);
    inner_viewport_scroll_layer_id = root->id();
    page_scale_layer_id = root_clip->id();
    root_clip->AddChild(root.Pass());
    host_impl_->sync_tree()->SetRootLayer(root_clip.Pass());
    host_impl_->sync_tree()->SetViewportLayersFromIds(
        Layer::INVALID_ID, page_scale_layer_id, inner_viewport_scroll_layer_id,
        Layer::INVALID_ID);
    // Set a viewport size that is large enough to contain both the top controls
    // and some content.
    host_impl_->SetViewportSize(viewport_size_);
    host_impl_->sync_tree()->set_top_controls_shrink_blink_size(true);
    host_impl_->DidChangeTopControlsPosition();
  }

  void SetupTopControlsAndScrollLayerWithVirtualViewport(
      const gfx::Size& inner_viewport_size,
      const gfx::Size& outer_viewport_size,
      const gfx::Size& scroll_layer_size) {
    CreateHostImpl(settings_, CreateOutputSurface());
    host_impl_->sync_tree()->set_top_controls_shrink_blink_size(true);
    host_impl_->DidChangeTopControlsPosition();

    scoped_ptr<LayerImpl> root =
        LayerImpl::Create(host_impl_->active_tree(), 1);
    scoped_ptr<LayerImpl> root_clip =
        LayerImpl::Create(host_impl_->active_tree(), 2);
    scoped_ptr<LayerImpl> page_scale =
        LayerImpl::Create(host_impl_->active_tree(), 3);

    scoped_ptr<LayerImpl> outer_scroll =
        LayerImpl::Create(host_impl_->active_tree(), 4);
    scoped_ptr<LayerImpl> outer_clip =
        LayerImpl::Create(host_impl_->active_tree(), 5);

    root_clip->SetBounds(inner_viewport_size);
    root->SetScrollClipLayer(root_clip->id());
    root->SetBounds(outer_viewport_size);
    root->SetContentBounds(outer_viewport_size);
    root->SetPosition(gfx::PointF());
    root->SetDrawsContent(false);
    root->SetIsContainerForFixedPositionLayers(true);
    root_clip->SetHasRenderSurface(true);
    outer_clip->SetBounds(outer_viewport_size);
    outer_scroll->SetScrollClipLayer(outer_clip->id());
    outer_scroll->SetBounds(scroll_layer_size);
    outer_scroll->SetContentBounds(scroll_layer_size);
    outer_scroll->SetPosition(gfx::PointF());
    outer_scroll->SetDrawsContent(false);
    outer_scroll->SetIsContainerForFixedPositionLayers(true);

    int inner_viewport_scroll_layer_id = root->id();
    int outer_viewport_scroll_layer_id = outer_scroll->id();
    int page_scale_layer_id = page_scale->id();

    outer_clip->AddChild(outer_scroll.Pass());
    root->AddChild(outer_clip.Pass());
    page_scale->AddChild(root.Pass());
    root_clip->AddChild(page_scale.Pass());

    host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
    host_impl_->active_tree()->SetViewportLayersFromIds(
        Layer::INVALID_ID, page_scale_layer_id, inner_viewport_scroll_layer_id,
        outer_viewport_scroll_layer_id);

    host_impl_->SetViewportSize(inner_viewport_size);
    LayerImpl* root_clip_ptr = host_impl_->active_tree()->root_layer();
    EXPECT_EQ(inner_viewport_size, root_clip_ptr->bounds());
  }

 protected:
  gfx::Size layer_size_;
  gfx::Size clip_size_;
  gfx::Size viewport_size_;
  float top_controls_height_;

  LayerTreeSettings settings_;
};  // class LayerTreeHostImplTopControlsTest

TEST_F(LayerTreeHostImplTopControlsTest, ScrollTopControlsByFractionalAmount) {
  SetupTopControlsAndScrollLayerWithVirtualViewport(
      gfx::Size(10, 10), gfx::Size(10, 10), gfx::Size(10, 10));
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));

  // Make the test scroll delta a fractional amount, to verify that the
  // fixed container size delta is (1) non-zero, and (2) fractional, and
  // (3) matches the movement of the top controls.
  gfx::Vector2dF top_controls_scroll_delta(0.f, 5.25f);
  host_impl_->top_controls_manager()->ScrollBegin();
  host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
  host_impl_->top_controls_manager()->ScrollEnd();

  LayerImpl* inner_viewport_scroll_layer =
      host_impl_->active_tree()->InnerViewportScrollLayer();
  DCHECK(inner_viewport_scroll_layer);
  host_impl_->ScrollEnd();
  EXPECT_EQ(top_controls_scroll_delta,
            inner_viewport_scroll_layer->FixedContainerSizeDelta());
}

// In this test, the outer viewport is initially unscrollable. We test that a
// scroll initiated on the inner viewport, causing the top controls to show and
// thus making the outer viewport scrollable, still scrolls the outer viewport.
TEST_F(LayerTreeHostImplTopControlsTest,
    TopControlsOuterViewportBecomesScrollable) {
  SetupTopControlsAndScrollLayerWithVirtualViewport(
      gfx::Size(10, 50), gfx::Size(10, 50), gfx::Size(10, 100));
  DrawFrame();

  LayerImpl *inner_scroll =
      host_impl_->active_tree()->InnerViewportScrollLayer();
  LayerImpl *inner_container =
      host_impl_->active_tree()->InnerViewportContainerLayer();
  LayerImpl *outer_scroll =
      host_impl_->active_tree()->OuterViewportScrollLayer();
  LayerImpl *outer_container =
      host_impl_->active_tree()->OuterViewportContainerLayer();

  // Need SetDrawsContent so ScrollBegin's hit test finds an actual layer.
  outer_scroll->SetDrawsContent(true);
  host_impl_->active_tree()->PushPageScaleFromMainThread(2.f, 1.f, 2.f);

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, 50.f));

  // The entire scroll delta should have been used to hide the top controls.
  // The viewport layers should be resized back to their full sizes.
  EXPECT_EQ(0.f,
      host_impl_->active_tree()->total_top_controls_content_offset());
  EXPECT_EQ(0.f, inner_scroll->TotalScrollOffset().y());
  EXPECT_EQ(100.f, inner_container->BoundsForScrolling().height());
  EXPECT_EQ(100.f, outer_container->BoundsForScrolling().height());

  // The inner viewport should be scrollable by 50px * page_scale.
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, 100.f));
  EXPECT_EQ(50.f, inner_scroll->TotalScrollOffset().y());
  EXPECT_EQ(0.f, outer_scroll->TotalScrollOffset().y());
  EXPECT_EQ(gfx::ScrollOffset(), outer_scroll->MaxScrollOffset());

  host_impl_->ScrollEnd();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), inner_scroll);

  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, -50.f));

  // The entire scroll delta should have been used to show the top controls.
  // The outer viewport should be resized to accomodate and scrolled to the
  // bottom of the document to keep the viewport in place.
  EXPECT_EQ(50.f,
      host_impl_->active_tree()->total_top_controls_content_offset());
  EXPECT_EQ(50.f, outer_container->BoundsForScrolling().height());
  EXPECT_EQ(50.f, inner_container->BoundsForScrolling().height());
  EXPECT_EQ(25.f, outer_scroll->TotalScrollOffset().y());
  EXPECT_EQ(25.f, inner_scroll->TotalScrollOffset().y());

  // Now when we continue scrolling, make sure the outer viewport gets scrolled
  // since it wasn't scrollable when the scroll began.
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, -20.f));
  EXPECT_EQ(15.f, outer_scroll->TotalScrollOffset().y());
  EXPECT_EQ(25.f, inner_scroll->TotalScrollOffset().y());

  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, -30.f));
  EXPECT_EQ(0.f, outer_scroll->TotalScrollOffset().y());
  EXPECT_EQ(25.f, inner_scroll->TotalScrollOffset().y());

  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.f, -50.f));
  host_impl_->ScrollEnd();

  EXPECT_EQ(0.f, outer_scroll->TotalScrollOffset().y());
  EXPECT_EQ(0.f, inner_scroll->TotalScrollOffset().y());
}

// Test that the fixed position container delta is appropriately adjusted
// by the top controls showing/hiding and page scale doesn't affect it.
TEST_F(LayerTreeHostImplTopControlsTest, FixedContainerDelta) {
  SetupTopControlsAndScrollLayerWithVirtualViewport(
      gfx::Size(100, 100), gfx::Size(100, 100), gfx::Size(100, 100));
  DrawFrame();

  float page_scale = 1.5f;
  LayerImpl* outer_viewport_scroll_layer =
      host_impl_->active_tree()->OuterViewportScrollLayer();

  // Zoom in, since the fixed container is the outer viewport, the delta should
  // not be scaled.
  host_impl_->active_tree()->PushPageScaleFromMainThread(page_scale, 1.f, 2.f);

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));

  // Scroll down, the top controls hiding should expand the viewport size so
  // the delta should be equal to the scroll distance.
  gfx::Vector2dF top_controls_scroll_delta(0.f, 20.f);
  host_impl_->top_controls_manager()->ScrollBegin();
  host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
  EXPECT_EQ(top_controls_height_ - top_controls_scroll_delta.y(),
            host_impl_->top_controls_manager()->ContentTopOffset());
  EXPECT_VECTOR_EQ(top_controls_scroll_delta,
                   outer_viewport_scroll_layer->FixedContainerSizeDelta());
  host_impl_->ScrollEnd();

  // Scroll past the maximum extent. The delta shouldn't be greater than the
  // top controls height.
  host_impl_->top_controls_manager()->ScrollBegin();
  host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
  host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
  host_impl_->top_controls_manager()->ScrollBy(top_controls_scroll_delta);
  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(0, top_controls_height_),
                   outer_viewport_scroll_layer->FixedContainerSizeDelta());
  host_impl_->ScrollEnd();

  // Scroll in the direction to make the top controls show.
  host_impl_->top_controls_manager()->ScrollBegin();
  host_impl_->top_controls_manager()->ScrollBy(-top_controls_scroll_delta);
  EXPECT_EQ(top_controls_scroll_delta.y(),
            host_impl_->top_controls_manager()->ContentTopOffset());
  EXPECT_VECTOR_EQ(
      gfx::Vector2dF(0, top_controls_height_ - top_controls_scroll_delta.y()),
      outer_viewport_scroll_layer->FixedContainerSizeDelta());
  host_impl_->top_controls_manager()->ScrollEnd();
}

// Test that if a scrollable sublayer doesn't consume the scroll,
// top controls should hide when scrolling down.
TEST_F(LayerTreeHostImplTopControlsTest, TopControlsScrollableSublayer) {
  gfx::Size sub_content_size(100, 400);
  gfx::Size sub_content_layer_size(100, 300);
  SetupTopControlsAndScrollLayerWithVirtualViewport(
      gfx::Size(100, 50), gfx::Size(100, 100), gfx::Size(100, 100));
  DrawFrame();

  // Show top controls
  EXPECT_EQ(top_controls_height_,
            host_impl_->active_tree()->total_top_controls_content_offset());

  LayerImpl* outer_viewport_scroll_layer =
      host_impl_->active_tree()->OuterViewportScrollLayer();
  int id = outer_viewport_scroll_layer->id();

  scoped_ptr<LayerImpl> child =
      LayerImpl::Create(host_impl_->active_tree(), id + 2);
  scoped_ptr<LayerImpl> child_clip =
      LayerImpl::Create(host_impl_->active_tree(), id + 3);

  child_clip->SetBounds(sub_content_layer_size);
  child->SetScrollClipLayer(child_clip->id());
  child->SetBounds(sub_content_size);
  child->SetContentBounds(sub_content_size);
  child->SetPosition(gfx::PointF());
  child->SetDrawsContent(true);
  child->SetIsContainerForFixedPositionLayers(true);

  // scroll child to limit
  child->SetScrollDelta(gfx::Vector2dF(0, 100.f));
  child_clip->AddChild(child.Pass());
  outer_viewport_scroll_layer->AddChild(child_clip.Pass());

  // Scroll 25px to hide top controls
  gfx::Vector2dF scroll_delta(0.f, 25.f);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  host_impl_->ScrollEnd();

  // Top controls should be hidden
  EXPECT_EQ(scroll_delta.y(),
            top_controls_height_ -
                host_impl_->active_tree()->total_top_controls_content_offset());
}

// Ensure setting the top controls position explicitly using the setters on the
// TreeImpl correctly affects the top controls manager and viewport bounds.
TEST_F(LayerTreeHostImplTopControlsTest, PositionTopControlsExplicitly) {
  CreateHostImpl(settings_, CreateOutputSurface());
  SetupTopControlsAndScrollLayer();
  DrawFrame();

  host_impl_->active_tree()->set_top_controls_delta(0.f);
  host_impl_->active_tree()->set_top_controls_content_offset(30.f);
  EXPECT_EQ(30.f, host_impl_->top_controls_manager()->ContentTopOffset());
  EXPECT_EQ(-20.f, host_impl_->top_controls_manager()->ControlsTopOffset());

  host_impl_->active_tree()->set_top_controls_delta(-30.f);
  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
  EXPECT_EQ(-50.f, host_impl_->top_controls_manager()->ControlsTopOffset());

  host_impl_->DidChangeTopControlsPosition();

  // Now that top controls have moved, expect the clip to resize.
  LayerImpl* root_clip_ptr = host_impl_->active_tree()->root_layer();
  EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
}

// Test that the top_controls delta and sent delta are appropriately
// applied on sync tree activation. The total top controls offset shouldn't
// change after the activation.
TEST_F(LayerTreeHostImplTopControlsTest, ApplyDeltaOnTreeActivation) {
  CreateHostImpl(settings_, CreateOutputSurface());
  SetupTopControlsAndScrollLayer();
  DrawFrame();

  host_impl_->sync_tree()->set_top_controls_content_offset(15.f);

  host_impl_->active_tree()->set_top_controls_content_offset(20.f);
  host_impl_->active_tree()->set_top_controls_delta(-20.f);
  host_impl_->active_tree()->set_sent_top_controls_delta(-5.f);

  host_impl_->DidChangeTopControlsPosition();
  LayerImpl* root_clip_ptr = host_impl_->active_tree()->root_layer();
  EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
  EXPECT_EQ(0.f,
      host_impl_->active_tree()->total_top_controls_content_offset());

  host_impl_->ActivateSyncTree();

  root_clip_ptr = host_impl_->active_tree()->root_layer();
  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
  EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());

  EXPECT_EQ(0.f, host_impl_->active_tree()->sent_top_controls_delta());
  EXPECT_EQ(-15.f, host_impl_->active_tree()->top_controls_delta());
  EXPECT_EQ(15.f, host_impl_->active_tree()->top_controls_content_offset());
  EXPECT_EQ(0.f,
      host_impl_->active_tree()->total_top_controls_content_offset());
}

// Test that changing the top controls layout height is correctly applied to
// the inner viewport container bounds. That is, the top controls layout
// height is the amount that the inner viewport container was shrunk outside
// the compositor to accommodate the top controls.
TEST_F(LayerTreeHostImplTopControlsTest, TopControlsLayoutHeightChanged) {
  CreateHostImpl(settings_, CreateOutputSurface());
  SetupTopControlsAndScrollLayer();
  DrawFrame();

  host_impl_->sync_tree()->set_top_controls_content_offset(50.f);
  host_impl_->sync_tree()->set_top_controls_shrink_blink_size(true);

  host_impl_->active_tree()->set_top_controls_content_offset(50.f);
  host_impl_->active_tree()->set_top_controls_delta(-50.f);

  host_impl_->DidChangeTopControlsPosition();
  LayerImpl* root_clip_ptr = host_impl_->active_tree()->root_layer();
  EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());

  host_impl_->sync_tree()->root_layer()->SetBounds(
      gfx::Size(root_clip_ptr->bounds().width(),
                root_clip_ptr->bounds().height() - 50.f));

  host_impl_->ActivateSyncTree();

  root_clip_ptr = host_impl_->active_tree()->root_layer();
  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());

  // The total bounds should remain unchanged since the bounds delta should
  // account for the difference between the layout height and the current
  // top controls offset.
  EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(0.f, 50.f), root_clip_ptr->bounds_delta());

  host_impl_->active_tree()->set_top_controls_delta(0.f);
  host_impl_->DidChangeTopControlsPosition();

  EXPECT_EQ(50.f, host_impl_->top_controls_manager()->ContentTopOffset());
  EXPECT_VECTOR_EQ(gfx::Vector2dF(0.f, 0.f), root_clip_ptr->bounds_delta());
  EXPECT_EQ(gfx::Size(viewport_size_.width(), viewport_size_.height() - 50.f),
            root_clip_ptr->bounds());
}

// Test that showing/hiding the top controls when the viewport is fully scrolled
// doesn't incorrectly change the viewport offset due to clamping from changing
// viewport bounds.
TEST_F(LayerTreeHostImplTopControlsTest, TopControlsViewportOffsetClamping) {
  SetupTopControlsAndScrollLayerWithVirtualViewport(
      gfx::Size(100, 100), gfx::Size(200, 200), gfx::Size(200, 400));
  DrawFrame();

  EXPECT_EQ(top_controls_height_,
            host_impl_->active_tree()->total_top_controls_content_offset());

  LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
  LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();

  // Scroll the viewports to max scroll offset.
  outer_scroll->SetScrollDelta(gfx::Vector2dF(0, 200.f));
  inner_scroll->SetScrollDelta(gfx::Vector2dF(100, 100.f));

  gfx::ScrollOffset viewport_offset =
      host_impl_->active_tree()->TotalScrollOffset();
  EXPECT_EQ(host_impl_->active_tree()->TotalMaxScrollOffset(), viewport_offset);

  // Hide the top controls by 25px.
  gfx::Vector2dF scroll_delta(0.f, 25.f);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);

  // scrolling down at the max extents no longer hides the top controls
  EXPECT_EQ(0.f,
            top_controls_height_ -
                host_impl_->active_tree()->total_top_controls_content_offset());

  // forcefully hide the top controls by 25px
  host_impl_->top_controls_manager()->ScrollBy(scroll_delta);
  host_impl_->ScrollEnd();

  EXPECT_EQ(scroll_delta.y(),
            top_controls_height_ -
                host_impl_->active_tree()->total_top_controls_content_offset());

  inner_scroll->ClampScrollToMaxScrollOffset();
  outer_scroll->ClampScrollToMaxScrollOffset();

  // We should still be fully scrolled.
  EXPECT_EQ(host_impl_->active_tree()->TotalMaxScrollOffset(),
            host_impl_->active_tree()->TotalScrollOffset());

  viewport_offset = host_impl_->active_tree()->TotalScrollOffset();

  // Bring the top controls down by 25px.
  scroll_delta = gfx::Vector2dF(0.f, -25.f);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  host_impl_->ScrollEnd();

  // The viewport offset shouldn't have changed.
  EXPECT_EQ(viewport_offset,
            host_impl_->active_tree()->TotalScrollOffset());

  // Scroll the viewports to max scroll offset.
  outer_scroll->SetScrollDelta(gfx::Vector2dF(0, 200.f));
  inner_scroll->SetScrollDelta(gfx::Vector2dF(100, 100.f));
  EXPECT_EQ(host_impl_->active_tree()->TotalMaxScrollOffset(),
            host_impl_->active_tree()->TotalScrollOffset());
}

// Test that the top controls coming in and out maintains the same aspect ratio
// between the inner and outer viewports.
TEST_F(LayerTreeHostImplTopControlsTest, TopControlsAspectRatio) {
  SetupTopControlsAndScrollLayerWithVirtualViewport(
      gfx::Size(100, 100), gfx::Size(200, 200), gfx::Size(200, 400));
  DrawFrame();

  EXPECT_EQ(top_controls_height_,
            host_impl_->active_tree()->total_top_controls_content_offset());

  gfx::Vector2dF scroll_delta(0.f, 25.f);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  host_impl_->ScrollEnd();

  EXPECT_EQ(scroll_delta.y(),
            top_controls_height_ -
                host_impl_->active_tree()->total_top_controls_content_offset());

  // Top controls were hidden by 25px so the inner viewport should have expanded
  // by that much.
  LayerImpl* outer_container =
            host_impl_->active_tree()->OuterViewportContainerLayer();
  LayerImpl* inner_container =
            host_impl_->active_tree()->InnerViewportContainerLayer();
  EXPECT_EQ(gfx::Size(100, 100+25), inner_container->BoundsForScrolling());

  // Outer viewport should match inner's aspect ratio. The bounds are ceiled.
  float aspect_ratio = inner_container->BoundsForScrolling().width() /
                       inner_container->BoundsForScrolling().height();
  gfx::Size expected = gfx::ToCeiledSize(gfx::SizeF(200, 200 / aspect_ratio));
  EXPECT_EQ(expected, outer_container->BoundsForScrolling());
  EXPECT_EQ(expected,
            host_impl_->InnerViewportScrollLayer()->BoundsForScrolling());
}

// Test that scrolling the outer viewport affects the top controls.
TEST_F(LayerTreeHostImplTopControlsTest, TopControlsScrollOuterViewport) {
  SetupTopControlsAndScrollLayerWithVirtualViewport(
      gfx::Size(100, 100), gfx::Size(200, 200), gfx::Size(200, 400));
  DrawFrame();

  EXPECT_EQ(top_controls_height_,
            host_impl_->active_tree()->total_top_controls_content_offset());

  // Send a gesture scroll that will scroll the outer viewport, make sure the
  // top controls get scrolled.
  gfx::Vector2dF scroll_delta(0.f, 15.f);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  EXPECT_EQ(host_impl_->OuterViewportScrollLayer(),
            host_impl_->CurrentlyScrollingLayer());
  host_impl_->ScrollEnd();

  EXPECT_EQ(scroll_delta.y(),
            top_controls_height_ -
                host_impl_->active_tree()->total_top_controls_content_offset());

  scroll_delta = gfx::Vector2dF(0.f, 50.f);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);

  EXPECT_EQ(0, host_impl_->active_tree()->total_top_controls_content_offset());
  EXPECT_EQ(host_impl_->OuterViewportScrollLayer(),
            host_impl_->CurrentlyScrollingLayer());

  host_impl_->ScrollEnd();

  // Position the viewports such that the inner viewport will be scrolled.
  gfx::Vector2dF inner_viewport_offset(0.f, 25.f);
  host_impl_->OuterViewportScrollLayer()->SetScrollDelta(gfx::Vector2dF());
  host_impl_->InnerViewportScrollLayer()->SetScrollDelta(inner_viewport_offset);

  scroll_delta = gfx::Vector2dF(0.f, -65.f);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);

  EXPECT_EQ(top_controls_height_,
            host_impl_->active_tree()->total_top_controls_content_offset());
  EXPECT_EQ(
      inner_viewport_offset.y() + (scroll_delta.y() + top_controls_height_),
      host_impl_->InnerViewportScrollLayer()->ScrollDelta().y());

  host_impl_->ScrollEnd();
}

TEST_F(LayerTreeHostImplTopControlsTest,
       ScrollNonScrollableRootWithTopControls) {
  CreateHostImpl(settings_, CreateOutputSurface());
  SetupTopControlsAndScrollLayer();
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));

  host_impl_->top_controls_manager()->ScrollBegin();
  host_impl_->top_controls_manager()->ScrollBy(gfx::Vector2dF(0.f, 50.f));
  host_impl_->top_controls_manager()->ScrollEnd();
  EXPECT_EQ(0.f, host_impl_->top_controls_manager()->ContentTopOffset());
  // Now that top controls have moved, expect the clip to resize.
  LayerImpl* root_clip_ptr = host_impl_->active_tree()->root_layer();
  EXPECT_EQ(viewport_size_, root_clip_ptr->bounds());

  host_impl_->ScrollEnd();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));

  float scroll_increment_y = -25.f;
  host_impl_->top_controls_manager()->ScrollBegin();
  host_impl_->top_controls_manager()->ScrollBy(
      gfx::Vector2dF(0.f, scroll_increment_y));
  EXPECT_EQ(-scroll_increment_y,
            host_impl_->top_controls_manager()->ContentTopOffset());
  // Now that top controls have moved, expect the clip to resize.
  EXPECT_EQ(gfx::Size(viewport_size_.width(),
                      viewport_size_.height() + scroll_increment_y),
            root_clip_ptr->bounds());

  host_impl_->top_controls_manager()->ScrollBy(
      gfx::Vector2dF(0.f, scroll_increment_y));
  host_impl_->top_controls_manager()->ScrollEnd();
  EXPECT_EQ(-2 * scroll_increment_y,
            host_impl_->top_controls_manager()->ContentTopOffset());
  // Now that top controls have moved, expect the clip to resize.
  EXPECT_EQ(clip_size_, root_clip_ptr->bounds());

  host_impl_->ScrollEnd();

  // Verify the layer is once-again non-scrollable.
  EXPECT_EQ(
      gfx::ScrollOffset(),
      host_impl_->active_tree()->InnerViewportScrollLayer()->MaxScrollOffset());

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
}

TEST_F(LayerTreeHostImplTest, ScrollNonCompositedRoot) {
  // Test the configuration where a non-composited root layer is embedded in a
  // scrollable outer layer.
  gfx::Size surface_size(10, 10);
  gfx::Size contents_size(20, 20);

  scoped_ptr<LayerImpl> content_layer =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  content_layer->SetDrawsContent(true);
  content_layer->SetPosition(gfx::PointF());
  content_layer->SetBounds(contents_size);
  content_layer->SetContentBounds(contents_size);
  content_layer->SetContentsScale(2.f, 2.f);

  scoped_ptr<LayerImpl> scroll_clip_layer =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  scroll_clip_layer->SetBounds(surface_size);

  scoped_ptr<LayerImpl> scroll_layer =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  scroll_layer->SetScrollClipLayer(3);
  scroll_layer->SetBounds(contents_size);
  scroll_layer->SetContentBounds(contents_size);
  scroll_layer->SetPosition(gfx::PointF());
  scroll_layer->AddChild(content_layer.Pass());
  scroll_clip_layer->AddChild(scroll_layer.Pass());

  scroll_clip_layer->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(scroll_clip_layer.Pass());
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(5, 5),
                                    InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  host_impl_->ScrollEnd();
  EXPECT_TRUE(did_request_redraw_);
  EXPECT_TRUE(did_request_commit_);
}

TEST_F(LayerTreeHostImplTest, ScrollChildCallsCommitAndRedraw) {
  gfx::Size surface_size(10, 10);
  gfx::Size contents_size(20, 20);
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetBounds(surface_size);
  root->SetContentBounds(contents_size);
  root->AddChild(CreateScrollableLayer(2, contents_size, root.get()));
  root->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(5, 5),
                                    InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  host_impl_->ScrollEnd();
  EXPECT_TRUE(did_request_redraw_);
  EXPECT_TRUE(did_request_commit_);
}

TEST_F(LayerTreeHostImplTest, ScrollMissesChild) {
  gfx::Size surface_size(10, 10);
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  root->AddChild(CreateScrollableLayer(2, surface_size, root.get()));
  root->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();

  // Scroll event is ignored because the input coordinate is outside the layer
  // boundaries.
  EXPECT_EQ(InputHandler::ScrollIgnored,
            host_impl_->ScrollBegin(gfx::Point(15, 5),
                                    InputHandler::Wheel));
  EXPECT_FALSE(did_request_redraw_);
  EXPECT_FALSE(did_request_commit_);
}

TEST_F(LayerTreeHostImplTest, ScrollMissesBackfacingChild) {
  gfx::Size surface_size(10, 10);
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetHasRenderSurface(true);
  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, surface_size, root.get());
  host_impl_->SetViewportSize(surface_size);

  gfx::Transform matrix;
  matrix.RotateAboutXAxis(180.0);
  child->SetTransform(matrix);
  child->SetDoubleSided(false);

  root->AddChild(child.Pass());
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  DrawFrame();

  // Scroll event is ignored because the scrollable layer is not facing the
  // viewer and there is nothing scrollable behind it.
  EXPECT_EQ(InputHandler::ScrollIgnored,
            host_impl_->ScrollBegin(gfx::Point(5, 5),
                                    InputHandler::Wheel));
  EXPECT_FALSE(did_request_redraw_);
  EXPECT_FALSE(did_request_commit_);
}

TEST_F(LayerTreeHostImplTest, ScrollBlockedByContentLayer) {
  gfx::Size surface_size(10, 10);
  scoped_ptr<LayerImpl> clip_layer =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  scoped_ptr<LayerImpl> content_layer =
      CreateScrollableLayer(1, surface_size, clip_layer.get());
  content_layer->SetShouldScrollOnMainThread(true);
  content_layer->SetScrollClipLayer(Layer::INVALID_ID);

  // Note: we can use the same clip layer for both since both calls to
  // CreateScrollableLayer() use the same surface size.
  scoped_ptr<LayerImpl> scroll_layer =
      CreateScrollableLayer(2, surface_size, clip_layer.get());
  scroll_layer->AddChild(content_layer.Pass());
  clip_layer->AddChild(scroll_layer.Pass());
  clip_layer->SetHasRenderSurface(true);

  host_impl_->active_tree()->SetRootLayer(clip_layer.Pass());
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();

  // Scrolling fails because the content layer is asking to be scrolled on the
  // main thread.
  EXPECT_EQ(InputHandler::ScrollOnMainThread,
            host_impl_->ScrollBegin(gfx::Point(5, 5),
                                    InputHandler::Wheel));
}

TEST_F(LayerTreeHostImplTest, ScrollRootAndChangePageScaleOnMainThread) {
  gfx::Size surface_size(20, 20);
  gfx::Size viewport_size(10, 10);
  float page_scale = 2.f;
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  scoped_ptr<LayerImpl> root_scrolling =
      CreateScrollableLayer(3, surface_size, root_clip.get());
  EXPECT_EQ(viewport_size, root_clip->bounds());
  root_scrolling->SetIsContainerForFixedPositionLayers(true);
  root_clip->AddChild(root_scrolling.Pass());
  root->AddChild(root_clip.Pass());
  root->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  // The behaviour in this test assumes the page scale is applied at a layer
  // above the clip layer.
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 3,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  host_impl_->SetViewportSize(viewport_size);
  DrawFrame();

  LayerImpl* root_scroll =
      host_impl_->active_tree()->InnerViewportScrollLayer();
  EXPECT_EQ(viewport_size, root_scroll->scroll_clip_layer()->bounds());

  gfx::Vector2d scroll_delta(0, 10);
  gfx::Vector2d expected_scroll_delta = scroll_delta;
  gfx::ScrollOffset expected_max_scroll = root_scroll->MaxScrollOffset();
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(5, 5),
                                    InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  host_impl_->ScrollEnd();

  // Set new page scale from main thread.
  host_impl_->active_tree()->PushPageScaleFromMainThread(page_scale, page_scale,
                                                         page_scale);

  scoped_ptr<ScrollAndScaleSet> scroll_info = host_impl_->ProcessScrollDeltas();
  ExpectContains(*scroll_info.get(), root_scroll->id(), expected_scroll_delta);

  // The scroll range should also have been updated.
  EXPECT_EQ(expected_max_scroll, root_scroll->MaxScrollOffset());

  // The page scale delta remains constant because the impl thread did not
  // scale.
  EXPECT_EQ(1.f, host_impl_->active_tree()->page_scale_delta());
}

TEST_F(LayerTreeHostImplTest, ScrollRootAndChangePageScaleOnImplThread) {
  gfx::Size surface_size(20, 20);
  gfx::Size viewport_size(10, 10);
  float page_scale = 2.f;
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  scoped_ptr<LayerImpl> root_scrolling =
      CreateScrollableLayer(3, surface_size, root_clip.get());
  EXPECT_EQ(viewport_size, root_clip->bounds());
  root_scrolling->SetIsContainerForFixedPositionLayers(true);
  root_clip->AddChild(root_scrolling.Pass());
  root->AddChild(root_clip.Pass());
  root->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  // The behaviour in this test assumes the page scale is applied at a layer
  // above the clip layer.
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 3,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  host_impl_->SetViewportSize(viewport_size);
  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 1.f, page_scale);
  DrawFrame();

  LayerImpl* root_scroll =
      host_impl_->active_tree()->InnerViewportScrollLayer();
  EXPECT_EQ(viewport_size, root_scroll->scroll_clip_layer()->bounds());

  gfx::Vector2d scroll_delta(0, 10);
  gfx::Vector2d expected_scroll_delta = scroll_delta;
  gfx::ScrollOffset expected_max_scroll = root_scroll->MaxScrollOffset();
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(5, 5),
                                    InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  host_impl_->ScrollEnd();

  // Set new page scale on impl thread by pinching.
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
  host_impl_->PinchGestureBegin();
  host_impl_->PinchGestureUpdate(page_scale, gfx::Point());
  host_impl_->PinchGestureEnd();
  host_impl_->ScrollEnd();
  DrawOneFrame();

  // The scroll delta is not scaled because the main thread did not scale.
  scoped_ptr<ScrollAndScaleSet> scroll_info = host_impl_->ProcessScrollDeltas();
  ExpectContains(*scroll_info.get(), root_scroll->id(), expected_scroll_delta);

  // The scroll range should also have been updated.
  EXPECT_EQ(expected_max_scroll, root_scroll->MaxScrollOffset());

  // The page scale delta should match the new scale on the impl side.
  EXPECT_EQ(page_scale, host_impl_->active_tree()->current_page_scale_factor());
}

TEST_F(LayerTreeHostImplTest, PageScaleDeltaAppliedToRootScrollLayerOnly) {
  gfx::Size surface_size(10, 10);
  float default_page_scale = 1.f;
  gfx::Transform default_page_scale_matrix;
  default_page_scale_matrix.Scale(default_page_scale, default_page_scale);

  float new_page_scale = 2.f;
  gfx::Transform new_page_scale_matrix;
  new_page_scale_matrix.Scale(new_page_scale, new_page_scale);

  // Create a normal scrollable root layer and another scrollable child layer.
  LayerImpl* scroll = SetupScrollAndContentsLayers(surface_size);
  LayerImpl* root = host_impl_->active_tree()->root_layer();
  LayerImpl* child = scroll->children()[0];

  scoped_ptr<LayerImpl> scrollable_child_clip =
      LayerImpl::Create(host_impl_->active_tree(), 6);
  scoped_ptr<LayerImpl> scrollable_child =
      CreateScrollableLayer(7, surface_size, scrollable_child_clip.get());
  scrollable_child_clip->AddChild(scrollable_child.Pass());
  child->AddChild(scrollable_child_clip.Pass());
  LayerImpl* grand_child = child->children()[0];

  // Set new page scale on impl thread by pinching.
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
  host_impl_->PinchGestureBegin();
  host_impl_->PinchGestureUpdate(new_page_scale, gfx::Point());
  host_impl_->PinchGestureEnd();
  host_impl_->ScrollEnd();
  DrawOneFrame();

  EXPECT_EQ(1.f, root->contents_scale_x());
  EXPECT_EQ(1.f, root->contents_scale_y());
  EXPECT_EQ(1.f, scroll->contents_scale_x());
  EXPECT_EQ(1.f, scroll->contents_scale_y());
  EXPECT_EQ(1.f, child->contents_scale_x());
  EXPECT_EQ(1.f, child->contents_scale_y());
  EXPECT_EQ(1.f, grand_child->contents_scale_x());
  EXPECT_EQ(1.f, grand_child->contents_scale_y());

  // Make sure all the layers are drawn with the page scale delta applied, i.e.,
  // the page scale delta on the root layer is applied hierarchically.
  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);

  EXPECT_EQ(1.f, root->draw_transform().matrix().getDouble(0, 0));
  EXPECT_EQ(1.f, root->draw_transform().matrix().getDouble(1, 1));
  EXPECT_EQ(new_page_scale, scroll->draw_transform().matrix().getDouble(0, 0));
  EXPECT_EQ(new_page_scale, scroll->draw_transform().matrix().getDouble(1, 1));
  EXPECT_EQ(new_page_scale, child->draw_transform().matrix().getDouble(0, 0));
  EXPECT_EQ(new_page_scale, child->draw_transform().matrix().getDouble(1, 1));
  EXPECT_EQ(new_page_scale,
            grand_child->draw_transform().matrix().getDouble(0, 0));
  EXPECT_EQ(new_page_scale,
            grand_child->draw_transform().matrix().getDouble(1, 1));
}

TEST_F(LayerTreeHostImplTest, ScrollChildAndChangePageScaleOnMainThread) {
  gfx::Size surface_size(30, 30);
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetBounds(gfx::Size(5, 5));
  root->SetHasRenderSurface(true);
  scoped_ptr<LayerImpl> root_scrolling =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  root_scrolling->SetBounds(surface_size);
  root_scrolling->SetContentBounds(surface_size);
  root_scrolling->SetScrollClipLayer(root->id());
  root_scrolling->SetIsContainerForFixedPositionLayers(true);
  LayerImpl* root_scrolling_ptr = root_scrolling.get();
  root->AddChild(root_scrolling.Pass());
  int child_scroll_layer_id = 3;
  scoped_ptr<LayerImpl> child_scrolling = CreateScrollableLayer(
      child_scroll_layer_id, surface_size, root_scrolling_ptr);
  LayerImpl* child = child_scrolling.get();
  root_scrolling_ptr->AddChild(child_scrolling.Pass());
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 2,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();

  gfx::Vector2d scroll_delta(0, 10);
  gfx::Vector2d expected_scroll_delta(scroll_delta);
  gfx::ScrollOffset expected_max_scroll(child->MaxScrollOffset());
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(5, 5),
                                    InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  host_impl_->ScrollEnd();

  float page_scale = 2.f;
  host_impl_->active_tree()->PushPageScaleFromMainThread(page_scale, 1.f,
                                                         page_scale);

  DrawOneFrame();

  scoped_ptr<ScrollAndScaleSet> scroll_info = host_impl_->ProcessScrollDeltas();
  ExpectContains(
      *scroll_info.get(), child_scroll_layer_id, expected_scroll_delta);

  // The scroll range should not have changed.
  EXPECT_EQ(child->MaxScrollOffset(), expected_max_scroll);

  // The page scale delta remains constant because the impl thread did not
  // scale.
  EXPECT_EQ(1.f, host_impl_->active_tree()->page_scale_delta());
}

TEST_F(LayerTreeHostImplTest, ScrollChildBeyondLimit) {
  // Scroll a child layer beyond its maximum scroll range and make sure the
  // parent layer is scrolled on the axis on which the child was unable to
  // scroll.
  gfx::Size surface_size(10, 10);
  gfx::Size content_size(20, 20);
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetBounds(surface_size);
  root->SetHasRenderSurface(true);
  scoped_ptr<LayerImpl> grand_child =
      CreateScrollableLayer(3, content_size, root.get());

  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, content_size, root.get());
  LayerImpl* grand_child_layer = grand_child.get();
  child->AddChild(grand_child.Pass());

  LayerImpl* child_layer = child.get();
  root->AddChild(child.Pass());
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  host_impl_->active_tree()->DidBecomeActive();
  host_impl_->SetViewportSize(surface_size);
  grand_child_layer->SetScrollOffset(gfx::ScrollOffset(0, 5));
  child_layer->SetScrollOffset(gfx::ScrollOffset(3, 0));

  DrawFrame();
  {
    gfx::Vector2d scroll_delta(-8, -7);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(),
                                      InputHandler::Wheel));
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();

    // The grand child should have scrolled up to its limit.
    LayerImpl* child = host_impl_->active_tree()->root_layer()->children()[0];
    LayerImpl* grand_child = child->children()[0];
    ExpectContains(*scroll_info.get(), grand_child->id(), gfx::Vector2d(0, -5));

    // The child should have only scrolled on the other axis.
    ExpectContains(*scroll_info.get(), child->id(), gfx::Vector2d(-3, 0));
  }
}

TEST_F(LayerTreeHostImplTest, ScrollWithoutBubbling) {
  // Scroll a child layer beyond its maximum scroll range and make sure the
  // the scroll doesn't bubble up to the parent layer.
  gfx::Size surface_size(20, 20);
  gfx::Size viewport_size(10, 10);
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetHasRenderSurface(true);
  scoped_ptr<LayerImpl> root_scrolling =
      CreateScrollableLayer(2, surface_size, root.get());
  root_scrolling->SetIsContainerForFixedPositionLayers(true);

  scoped_ptr<LayerImpl> grand_child =
      CreateScrollableLayer(4, surface_size, root.get());

  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(3, surface_size, root.get());
  LayerImpl* grand_child_layer = grand_child.get();
  child->AddChild(grand_child.Pass());

  LayerImpl* child_layer = child.get();
  root_scrolling->AddChild(child.Pass());
  root->AddChild(root_scrolling.Pass());
  EXPECT_EQ(viewport_size, root->bounds());
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 2,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  host_impl_->SetViewportSize(viewport_size);

  grand_child_layer->SetScrollOffset(gfx::ScrollOffset(0, 2));
  child_layer->SetScrollOffset(gfx::ScrollOffset(0, 3));

  DrawFrame();
  {
    gfx::Vector2d scroll_delta(0, -10);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(),
                                      InputHandler::NonBubblingGesture));
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();

    // The grand child should have scrolled up to its limit.
    LayerImpl* child =
        host_impl_->active_tree()->root_layer()->children()[0]->children()[0];
    LayerImpl* grand_child = child->children()[0];
    ExpectContains(*scroll_info.get(), grand_child->id(), gfx::Vector2d(0, -2));

    // The child should not have scrolled.
    ExpectNone(*scroll_info.get(), child->id());

    // The next time we scroll we should only scroll the parent.
    scroll_delta = gfx::Vector2d(0, -3);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(5, 5),
                                      InputHandler::NonBubblingGesture));
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), grand_child);
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), child);
    host_impl_->ScrollEnd();

    scroll_info = host_impl_->ProcessScrollDeltas();

    // The child should have scrolled up to its limit.
    ExpectContains(*scroll_info.get(), child->id(), gfx::Vector2d(0, -3));

    // The grand child should not have scrolled.
    ExpectContains(*scroll_info.get(), grand_child->id(), gfx::Vector2d(0, -2));

    // After scrolling the parent, another scroll on the opposite direction
    // should still scroll the child.
    scroll_delta = gfx::Vector2d(0, 7);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(5, 5),
                                      InputHandler::NonBubblingGesture));
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), grand_child);
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), grand_child);
    host_impl_->ScrollEnd();

    scroll_info = host_impl_->ProcessScrollDeltas();

    // The grand child should have scrolled.
    ExpectContains(*scroll_info.get(), grand_child->id(), gfx::Vector2d(0, 5));

    // The child should not have scrolled.
    ExpectContains(*scroll_info.get(), child->id(), gfx::Vector2d(0, -3));


    // Scrolling should be adjusted from viewport space.
    host_impl_->active_tree()->PushPageScaleFromMainThread(2.f, 2.f, 2.f);
    host_impl_->SetPageScaleOnActiveTree(2.f);

    scroll_delta = gfx::Vector2d(0, -2);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(1, 1),
                                      InputHandler::NonBubblingGesture));
    EXPECT_EQ(grand_child, host_impl_->CurrentlyScrollingLayer());
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    host_impl_->ScrollEnd();

    scroll_info = host_impl_->ProcessScrollDeltas();

    // Should have scrolled by half the amount in layer space (5 - 2/2)
    ExpectContains(*scroll_info.get(), grand_child->id(), gfx::Vector2d(0, 4));
  }
}
TEST_F(LayerTreeHostImplTest, ScrollEventBubbling) {
  // When we try to scroll a non-scrollable child layer, the scroll delta
  // should be applied to one of its ancestors if possible.
  gfx::Size surface_size(10, 10);
  gfx::Size content_size(20, 20);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  root_clip->SetHasRenderSurface(true);
  scoped_ptr<LayerImpl> root =
      CreateScrollableLayer(1, content_size, root_clip.get());
  // Make 'root' the clip layer for child: since they have the same sizes the
  // child will have zero max_scroll_offset and scrolls will bubble.
  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, content_size, root.get());
  child->SetIsContainerForFixedPositionLayers(true);
  root->SetBounds(content_size);

  int root_scroll_id = root->id();
  root->AddChild(child.Pass());
  root_clip->AddChild(root.Pass());

  host_impl_->SetViewportSize(surface_size);
  host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 3, 2,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  DrawFrame();
  {
    gfx::Vector2d scroll_delta(0, 4);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(5, 5),
                                      InputHandler::Wheel));
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();

    // Only the root scroll should have scrolled.
    ASSERT_EQ(scroll_info->scrolls.size(), 1u);
    ExpectContains(*scroll_info.get(), root_scroll_id, scroll_delta);
  }
}

TEST_F(LayerTreeHostImplTest, ScrollBeforeRedraw) {
  gfx::Size surface_size(10, 10);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  scoped_ptr<LayerImpl> root_scroll =
      CreateScrollableLayer(2, surface_size, root_clip.get());
  root_scroll->SetIsContainerForFixedPositionLayers(true);
  root_clip->SetHasRenderSurface(true);
  root_clip->AddChild(root_scroll.Pass());
  host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 2,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  host_impl_->SetViewportSize(surface_size);

  // Draw one frame and then immediately rebuild the layer tree to mimic a tree
  // synchronization.
  DrawFrame();
  host_impl_->active_tree()->DetachLayerTree();
  scoped_ptr<LayerImpl> root_clip2 =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  scoped_ptr<LayerImpl> root_scroll2 =
      CreateScrollableLayer(4, surface_size, root_clip2.get());
  root_scroll2->SetIsContainerForFixedPositionLayers(true);
  root_clip2->AddChild(root_scroll2.Pass());
  root_clip2->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(root_clip2.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 3, 4,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();

  // Scrolling should still work even though we did not draw yet.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(5, 5),
                                    InputHandler::Wheel));
}

TEST_F(LayerTreeHostImplTest, ScrollAxisAlignedRotatedLayer) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));

  // Rotate the root layer 90 degrees counter-clockwise about its center.
  gfx::Transform rotate_transform;
  rotate_transform.Rotate(-90.0);
  host_impl_->active_tree()->root_layer()->SetTransform(rotate_transform);

  gfx::Size surface_size(50, 50);
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();

  // Scroll to the right in screen coordinates with a gesture.
  gfx::Vector2d gesture_scroll_delta(10, 0);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(),
                                    InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), gesture_scroll_delta);
  host_impl_->ScrollEnd();

  // The layer should have scrolled down in its local coordinates.
  scoped_ptr<ScrollAndScaleSet> scroll_info = host_impl_->ProcessScrollDeltas();
  ExpectContains(*scroll_info.get(),
                 scroll_layer->id(),
                 gfx::Vector2d(0, gesture_scroll_delta.x()));

  // Reset and scroll down with the wheel.
  scroll_layer->SetScrollDelta(gfx::Vector2dF());
  gfx::Vector2d wheel_scroll_delta(0, 10);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(),
                                    InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), wheel_scroll_delta);
  host_impl_->ScrollEnd();

  // The layer should have scrolled down in its local coordinates.
  scroll_info = host_impl_->ProcessScrollDeltas();
  ExpectContains(*scroll_info.get(),
                 scroll_layer->id(),
                 wheel_scroll_delta);
}

TEST_F(LayerTreeHostImplTest, ScrollNonAxisAlignedRotatedLayer) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
  int child_clip_layer_id = 6;
  int child_layer_id = 7;
  float child_layer_angle = -20.f;

  // Create a child layer that is rotated to a non-axis-aligned angle.
  scoped_ptr<LayerImpl> clip_layer =
      LayerImpl::Create(host_impl_->active_tree(), child_clip_layer_id);
  scoped_ptr<LayerImpl> child = CreateScrollableLayer(
      child_layer_id, scroll_layer->content_bounds(), clip_layer.get());
  gfx::Transform rotate_transform;
  rotate_transform.Translate(-50.0, -50.0);
  rotate_transform.Rotate(child_layer_angle);
  rotate_transform.Translate(50.0, 50.0);
  clip_layer->SetTransform(rotate_transform);

  // Only allow vertical scrolling.
  clip_layer->SetBounds(
      gfx::Size(child->bounds().width(), child->bounds().height() / 2));
  // The rotation depends on the layer's transform origin, and the child layer
  // is a different size than the clip, so make sure the clip layer's origin
  // lines up over the child.
  clip_layer->SetTransformOrigin(gfx::Point3F(
      clip_layer->bounds().width() * 0.5f, clip_layer->bounds().height(), 0.f));
  LayerImpl* child_ptr = child.get();
  clip_layer->AddChild(child.Pass());
  scroll_layer->AddChild(clip_layer.Pass());

  gfx::Size surface_size(50, 50);
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();
  {
    // Scroll down in screen coordinates with a gesture.
    gfx::Vector2d gesture_scroll_delta(0, 10);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(1, 1),
                                      InputHandler::Gesture));
    host_impl_->ScrollBy(gfx::Point(), gesture_scroll_delta);
    host_impl_->ScrollEnd();

    // The child layer should have scrolled down in its local coordinates an
    // amount proportional to the angle between it and the input scroll delta.
    gfx::Vector2d expected_scroll_delta(
        0,
        gesture_scroll_delta.y() *
            std::cos(MathUtil::Deg2Rad(child_layer_angle)));
    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    ExpectContains(*scroll_info.get(), child_layer_id, expected_scroll_delta);

    // The root scroll layer should not have scrolled, because the input delta
    // was close to the layer's axis of movement.
    EXPECT_EQ(scroll_info->scrolls.size(), 1u);
  }
  {
    // Now reset and scroll the same amount horizontally.
    child_ptr->SetScrollDelta(gfx::Vector2dF());
    gfx::Vector2d gesture_scroll_delta(10, 0);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(1, 1),
                                      InputHandler::Gesture));
    host_impl_->ScrollBy(gfx::Point(), gesture_scroll_delta);
    host_impl_->ScrollEnd();

    // The child layer should have scrolled down in its local coordinates an
    // amount proportional to the angle between it and the input scroll delta.
    gfx::Vector2d expected_scroll_delta(
        0,
        -gesture_scroll_delta.x() *
            std::sin(MathUtil::Deg2Rad(child_layer_angle)));
    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();
    ExpectContains(*scroll_info.get(), child_layer_id, expected_scroll_delta);

    // The root scroll layer should have scrolled more, since the input scroll
    // delta was mostly orthogonal to the child layer's vertical scroll axis.
    gfx::Vector2d expected_root_scroll_delta(
        gesture_scroll_delta.x() *
            std::pow(std::cos(MathUtil::Deg2Rad(child_layer_angle)), 2),
        0);
    ExpectContains(*scroll_info.get(),
                   scroll_layer->id(),
                   expected_root_scroll_delta);
  }
}

TEST_F(LayerTreeHostImplTest, ScrollScaledLayer) {
  LayerImpl* scroll_layer =
      SetupScrollAndContentsLayers(gfx::Size(100, 100));

  // Scale the layer to twice its normal size.
  int scale = 2;
  gfx::Transform scale_transform;
  scale_transform.Scale(scale, scale);
  scroll_layer->SetTransform(scale_transform);

  gfx::Size surface_size(50, 50);
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();

  // Scroll down in screen coordinates with a gesture.
  gfx::Vector2d scroll_delta(0, 10);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  host_impl_->ScrollEnd();

  // The layer should have scrolled down in its local coordinates, but half the
  // amount.
  scoped_ptr<ScrollAndScaleSet> scroll_info = host_impl_->ProcessScrollDeltas();
  ExpectContains(*scroll_info.get(),
                 scroll_layer->id(),
                 gfx::Vector2d(0, scroll_delta.y() / scale));

  // Reset and scroll down with the wheel.
  scroll_layer->SetScrollDelta(gfx::Vector2dF());
  gfx::Vector2d wheel_scroll_delta(0, 10);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), wheel_scroll_delta);
  host_impl_->ScrollEnd();

  // It should apply the scale factor to the scroll delta for the wheel event.
  scroll_info = host_impl_->ProcessScrollDeltas();
  ExpectContains(*scroll_info.get(),
                 scroll_layer->id(),
                 wheel_scroll_delta);
}

TEST_F(LayerTreeHostImplTest, ScrollViewportRounding) {
  int width = 332;
  int height = 20;
  int scale = 3;
  SetupScrollAndContentsLayers(gfx::Size(width, height));
  host_impl_->active_tree()->InnerViewportContainerLayer()->SetBounds(
      gfx::Size(width * scale - 1, height * scale));
  host_impl_->SetDeviceScaleFactor(scale);
  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);

  LayerImpl* inner_viewport_scroll_layer =
      host_impl_->active_tree()->InnerViewportScrollLayer();
  EXPECT_EQ(gfx::ScrollOffset(0, 0),
            inner_viewport_scroll_layer->MaxScrollOffset());
}

class TestScrollOffsetDelegate : public LayerScrollOffsetDelegate {
 public:
  TestScrollOffsetDelegate()
      : page_scale_factor_(0.f),
        min_page_scale_factor_(-1.f),
        max_page_scale_factor_(-1.f) {}

  ~TestScrollOffsetDelegate() override {}

  gfx::ScrollOffset GetTotalScrollOffset() override {
    return getter_return_value_;
  }

  bool IsExternalFlingActive() const override { return false; }

  void UpdateRootLayerState(const gfx::ScrollOffset& total_scroll_offset,
                            const gfx::ScrollOffset& max_scroll_offset,
                            const gfx::SizeF& scrollable_size,
                            float page_scale_factor,
                            float min_page_scale_factor,
                            float max_page_scale_factor) override {
    DCHECK(total_scroll_offset.x() <= max_scroll_offset.x());
    DCHECK(total_scroll_offset.y() <= max_scroll_offset.y());
    last_set_scroll_offset_ = total_scroll_offset;
    max_scroll_offset_ = max_scroll_offset;
    scrollable_size_ = scrollable_size;
    page_scale_factor_ = page_scale_factor;
    min_page_scale_factor_ = min_page_scale_factor;
    max_page_scale_factor_ = max_page_scale_factor;
  }

  gfx::ScrollOffset last_set_scroll_offset() {
    return last_set_scroll_offset_;
  }

  void set_getter_return_value(const gfx::ScrollOffset& value) {
    getter_return_value_ = value;
  }

  gfx::ScrollOffset max_scroll_offset() const {
    return max_scroll_offset_;
  }

  gfx::SizeF scrollable_size() const {
    return scrollable_size_;
  }

  float page_scale_factor() const {
    return page_scale_factor_;
  }

  float min_page_scale_factor() const {
    return min_page_scale_factor_;
  }

  float max_page_scale_factor() const {
    return max_page_scale_factor_;
  }

 private:
  gfx::ScrollOffset last_set_scroll_offset_;
  gfx::ScrollOffset getter_return_value_;
  gfx::ScrollOffset max_scroll_offset_;
  gfx::SizeF scrollable_size_;
  float page_scale_factor_;
  float min_page_scale_factor_;
  float max_page_scale_factor_;
};

TEST_F(LayerTreeHostImplTest, RootLayerScrollOffsetDelegation) {
  TestScrollOffsetDelegate scroll_delegate;
  host_impl_->SetViewportSize(gfx::Size(10, 20));
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
  LayerImpl* clip_layer = scroll_layer->parent()->parent();
  clip_layer->SetBounds(gfx::Size(10, 20));

  // Setting the delegate results in the current scroll offset being set.
  gfx::Vector2dF initial_scroll_delta(10.f, 10.f);
  scroll_layer->SetScrollOffset(gfx::ScrollOffset());
  scroll_layer->SetScrollDelta(initial_scroll_delta);
  host_impl_->SetRootLayerScrollOffsetDelegate(&scroll_delegate);
  EXPECT_EQ(initial_scroll_delta.ToString(),
            scroll_delegate.last_set_scroll_offset().ToString());

  // Setting the delegate results in the scrollable_size, max_scroll_offset,
  // page_scale_factor and {min|max}_page_scale_factor being set.
  EXPECT_EQ(gfx::SizeF(100, 100), scroll_delegate.scrollable_size());
  EXPECT_EQ(gfx::ScrollOffset(90, 80), scroll_delegate.max_scroll_offset());
  EXPECT_EQ(1.f, scroll_delegate.page_scale_factor());
  EXPECT_EQ(0.f, scroll_delegate.min_page_scale_factor());
  EXPECT_EQ(0.f, scroll_delegate.max_page_scale_factor());

  // Updating page scale immediately updates the delegate.
  host_impl_->active_tree()->PushPageScaleFromMainThread(2.f, 0.5f, 4.f);
  EXPECT_EQ(2.f, scroll_delegate.page_scale_factor());
  EXPECT_EQ(0.5f, scroll_delegate.min_page_scale_factor());
  EXPECT_EQ(4.f, scroll_delegate.max_page_scale_factor());
  host_impl_->SetPageScaleOnActiveTree(2.f * 1.5f);
  EXPECT_EQ(3.f, scroll_delegate.page_scale_factor());
  EXPECT_EQ(0.5f, scroll_delegate.min_page_scale_factor());
  EXPECT_EQ(4.f, scroll_delegate.max_page_scale_factor());
  host_impl_->SetPageScaleOnActiveTree(2.f);
  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
  EXPECT_EQ(1.f, scroll_delegate.page_scale_factor());
  EXPECT_EQ(0.5f, scroll_delegate.min_page_scale_factor());
  EXPECT_EQ(4.f, scroll_delegate.max_page_scale_factor());

  // The pinch gesture doesn't put the delegate into a state where the scroll
  // offset is outside of the scroll range.  (this is verified by DCHECKs in the
  // delegate).
  host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
  host_impl_->PinchGestureBegin();
  host_impl_->PinchGestureUpdate(2.f, gfx::Point());
  host_impl_->PinchGestureUpdate(.5f, gfx::Point());
  host_impl_->PinchGestureEnd();
  host_impl_->ScrollEnd();

  // Scrolling should be relative to the offset as returned by the delegate.
  gfx::Vector2dF scroll_delta(0.f, 10.f);
  gfx::ScrollOffset current_offset(7.f, 8.f);

  scroll_delegate.set_getter_return_value(current_offset);
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));

  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  EXPECT_EQ(ScrollOffsetWithDelta(current_offset, scroll_delta),
            scroll_delegate.last_set_scroll_offset());

  current_offset = gfx::ScrollOffset(42.f, 41.f);
  scroll_delegate.set_getter_return_value(current_offset);
  host_impl_->ScrollBy(gfx::Point(), scroll_delta);
  EXPECT_EQ(current_offset + gfx::ScrollOffset(scroll_delta),
            scroll_delegate.last_set_scroll_offset());
  host_impl_->ScrollEnd();
  scroll_delegate.set_getter_return_value(gfx::ScrollOffset());

  // Forces a full tree synchronization and ensures that the scroll delegate
  // sees the correct size of the new tree.
  gfx::Size new_size(42, 24);
  host_impl_->CreatePendingTree();
  CreateScrollAndContentsLayers(host_impl_->pending_tree(), new_size);
  host_impl_->ActivateSyncTree();
  EXPECT_EQ(new_size, scroll_delegate.scrollable_size());

  // Un-setting the delegate should propagate the delegate's current offset to
  // the root scrollable layer.
  current_offset = gfx::ScrollOffset(13.f, 12.f);
  scroll_delegate.set_getter_return_value(current_offset);
  host_impl_->SetRootLayerScrollOffsetDelegate(NULL);

  EXPECT_EQ(current_offset.ToString(),
            scroll_layer->TotalScrollOffset().ToString());
}

void CheckLayerScrollDelta(LayerImpl* layer, gfx::Vector2dF scroll_delta) {
  const gfx::Transform target_space_transform =
      layer->draw_properties().target_space_transform;
  EXPECT_TRUE(target_space_transform.IsScaleOrTranslation());
  gfx::Point translated_point;
  target_space_transform.TransformPoint(&translated_point);
  gfx::Point expected_point = gfx::Point() - ToRoundedVector2d(scroll_delta);
  EXPECT_EQ(expected_point.ToString(), translated_point.ToString());
}

TEST_F(LayerTreeHostImplTest,
       ExternalRootLayerScrollOffsetDelegationReflectedInNextDraw) {
  TestScrollOffsetDelegate scroll_delegate;
  host_impl_->SetViewportSize(gfx::Size(10, 20));
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
  LayerImpl* clip_layer = scroll_layer->parent()->parent();
  clip_layer->SetBounds(gfx::Size(10, 20));
  host_impl_->SetRootLayerScrollOffsetDelegate(&scroll_delegate);

  // Draw first frame to clear any pending draws and check scroll.
  DrawFrame();
  CheckLayerScrollDelta(scroll_layer, gfx::Vector2dF(0.f, 0.f));
  EXPECT_FALSE(host_impl_->active_tree()->needs_update_draw_properties());

  // Set external scroll delta on delegate and notify LayerTreeHost.
  gfx::ScrollOffset scroll_offset(10.f, 10.f);
  scroll_delegate.set_getter_return_value(scroll_offset);
  host_impl_->OnRootLayerDelegatedScrollOffsetChanged();

  // Check scroll delta reflected in layer.
  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  EXPECT_FALSE(frame.has_no_damage);
  CheckLayerScrollDelta(scroll_layer, ScrollOffsetToVector2dF(scroll_offset));

  host_impl_->SetRootLayerScrollOffsetDelegate(NULL);
}

TEST_F(LayerTreeHostImplTest, OverscrollRoot) {
  InputHandlerScrollResult scroll_result;
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
  DrawFrame();
  EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());

  // In-bounds scrolling does not affect overscroll.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_FALSE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());

  // Overscroll events are reflected immediately.
  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 50));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_TRUE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, 10), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, 10), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  // In-bounds scrolling resets accumulated overscroll for the scrolled axes.
  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -50));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_FALSE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, 0), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -10));
  EXPECT_FALSE(scroll_result.did_scroll);
  EXPECT_TRUE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, -10), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, -10), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(10, 0));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_FALSE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, 0), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, -10), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(-15, 0));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_TRUE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(-5, 0), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(-5, -10), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 60));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_TRUE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, 10), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(-5, 10), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(10, -60));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_TRUE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, -10), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, -10), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  // Overscroll accumulates within the scope of ScrollBegin/ScrollEnd as long
  // as no scroll occurs.
  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -20));
  EXPECT_FALSE(scroll_result.did_scroll);
  EXPECT_TRUE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, -20), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, -30), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -20));
  EXPECT_FALSE(scroll_result.did_scroll);
  EXPECT_TRUE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, -20), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, -50), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  // Overscroll resets on valid scroll.
  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_FALSE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, 0), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, 0), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  scroll_result = host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -20));
  EXPECT_TRUE(scroll_result.did_scroll);
  EXPECT_TRUE(scroll_result.did_overscroll_root);
  EXPECT_EQ(gfx::Vector2dF(0, -10), scroll_result.unused_scroll_delta);
  EXPECT_EQ(gfx::Vector2dF(0, -10), host_impl_->accumulated_root_overscroll());
  EXPECT_EQ(scroll_result.accumulated_root_overscroll,
            host_impl_->accumulated_root_overscroll());

  host_impl_->ScrollEnd();
}


TEST_F(LayerTreeHostImplTest, OverscrollChildWithoutBubbling) {
  // Scroll child layers beyond their maximum scroll range and make sure root
  // overscroll does not accumulate.
  gfx::Size surface_size(10, 10);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 4);
  root_clip->SetHasRenderSurface(true);

  scoped_ptr<LayerImpl> root =
      CreateScrollableLayer(1, surface_size, root_clip.get());

  scoped_ptr<LayerImpl> grand_child =
      CreateScrollableLayer(3, surface_size, root_clip.get());

  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, surface_size, root_clip.get());
  LayerImpl* grand_child_layer = grand_child.get();
  child->AddChild(grand_child.Pass());

  LayerImpl* child_layer = child.get();
  root->AddChild(child.Pass());
  root_clip->AddChild(root.Pass());
  child_layer->SetScrollOffset(gfx::ScrollOffset(0, 3));
  grand_child_layer->SetScrollOffset(gfx::ScrollOffset(0, 2));
  host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  host_impl_->active_tree()->DidBecomeActive();
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();
  {
    gfx::Vector2d scroll_delta(0, -10);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(),
                                      InputHandler::NonBubblingGesture));
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());
    host_impl_->ScrollEnd();

    // The next time we scroll we should only scroll the parent, but overscroll
    // should still not reach the root layer.
    scroll_delta = gfx::Vector2d(0, -30);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(5, 5),
                                      InputHandler::NonBubblingGesture));
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), grand_child_layer);
    EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), child_layer);
    EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());
    host_impl_->ScrollEnd();

    // After scrolling the parent, another scroll on the opposite direction
    // should scroll the child.
    scroll_delta = gfx::Vector2d(0, 70);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(5, 5),
                                      InputHandler::NonBubblingGesture));
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), grand_child_layer);
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), grand_child_layer);
    EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());
    host_impl_->ScrollEnd();
  }
}

TEST_F(LayerTreeHostImplTest, OverscrollChildEventBubbling) {
  // When we try to scroll a non-scrollable child layer, the scroll delta
  // should be applied to one of its ancestors if possible. Overscroll should
  // be reflected only when it has bubbled up to the root scrolling layer.
  gfx::Size surface_size(10, 10);
  gfx::Size content_size(20, 20);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  root_clip->SetHasRenderSurface(true);

  scoped_ptr<LayerImpl> root =
      CreateScrollableLayer(1, content_size, root_clip.get());
  root->SetIsContainerForFixedPositionLayers(true);
  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, content_size, root_clip.get());

  child->SetScrollClipLayer(Layer::INVALID_ID);
  root->AddChild(child.Pass());
  root_clip->AddChild(root.Pass());

  host_impl_->SetViewportSize(surface_size);
  host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 3, 1,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  DrawFrame();
  {
    gfx::Vector2d scroll_delta(0, 8);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(5, 5),
                                      InputHandler::Wheel));
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    EXPECT_EQ(gfx::Vector2dF(0, 6), host_impl_->accumulated_root_overscroll());
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    EXPECT_EQ(gfx::Vector2dF(0, 14), host_impl_->accumulated_root_overscroll());
    host_impl_->ScrollEnd();
  }
}

TEST_F(LayerTreeHostImplTest, OverscrollAlways) {
  LayerTreeSettings settings;
  CreateHostImpl(settings, CreateOutputSurface());

  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(50, 50));
  LayerImpl* clip_layer = scroll_layer->parent()->parent();
  clip_layer->SetBounds(gfx::Size(50, 50));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
  DrawFrame();
  EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());

  // Even though the layer can't scroll the overscroll still happens.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
  host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10));
  EXPECT_EQ(gfx::Vector2dF(0, 10), host_impl_->accumulated_root_overscroll());
}

TEST_F(LayerTreeHostImplTest, NoOverscrollOnFractionalDeviceScale) {
  gfx::Size surface_size(980, 1439);
  gfx::Size content_size(980, 1438);
  float device_scale_factor = 1.5f;
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  root_clip->SetHasRenderSurface(true);

  scoped_ptr<LayerImpl> root =
      CreateScrollableLayer(1, content_size, root_clip.get());
  root->SetIsContainerForFixedPositionLayers(true);
  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, content_size, root_clip.get());
  root->scroll_clip_layer()->SetBounds(gfx::Size(320, 469));
  host_impl_->active_tree()->PushPageScaleFromMainThread(0.326531f, 0.326531f,
                                                         5.f);
  host_impl_->SetPageScaleOnActiveTree(0.326531f);
  child->SetScrollClipLayer(Layer::INVALID_ID);
  root->AddChild(child.Pass());
  root_clip->AddChild(root.Pass());

  host_impl_->SetViewportSize(surface_size);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 3, 1,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  DrawFrame();
  {
    // Horizontal & Vertical GlowEffect should not be applied when
    // content size is less then view port size. For Example Horizontal &
    // vertical GlowEffect should not be applied in about:blank page.
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(0, 0), InputHandler::Wheel));
    host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0, -1));
    EXPECT_EQ(gfx::Vector2dF().ToString(),
              host_impl_->accumulated_root_overscroll().ToString());

    host_impl_->ScrollEnd();
  }
}

TEST_F(LayerTreeHostImplTest, NoOverscrollWhenNotAtEdge) {
  gfx::Size surface_size(100, 100);
  gfx::Size content_size(200, 200);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  root_clip->SetHasRenderSurface(true);

  scoped_ptr<LayerImpl> root =
      CreateScrollableLayer(1, content_size, root_clip.get());
  root->SetIsContainerForFixedPositionLayers(true);
  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, content_size, root_clip.get());

  child->SetScrollClipLayer(Layer::INVALID_ID);
  root->AddChild(child.Pass());
  root_clip->AddChild(root.Pass());

  host_impl_->SetViewportSize(surface_size);
  host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 3, 1,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  DrawFrame();
  {
    // Edge glow effect should be applicable only upon reaching Edges
    // of the content. unnecessary glow effect calls shouldn't be
    // called while scrolling up without reaching the edge of the content.
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(0, 0), InputHandler::Wheel));
    host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0, 100));
    EXPECT_EQ(gfx::Vector2dF().ToString(),
              host_impl_->accumulated_root_overscroll().ToString());
    host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0, -2.30f));
    EXPECT_EQ(gfx::Vector2dF().ToString(),
              host_impl_->accumulated_root_overscroll().ToString());
    host_impl_->ScrollEnd();
    // unusedrootDelta should be subtracted from applied delta so that
    // unwanted glow effect calls are not called.
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(0, 0),
                                      InputHandler::NonBubblingGesture));
    EXPECT_EQ(InputHandler::ScrollStarted, host_impl_->FlingScrollBegin());
    host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0, 20));
    EXPECT_EQ(gfx::Vector2dF(0.000000f, 17.699997f).ToString(),
              host_impl_->accumulated_root_overscroll().ToString());

    host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(0.02f, -0.01f));
    EXPECT_EQ(gfx::Vector2dF(0.000000f, 17.699997f).ToString(),
              host_impl_->accumulated_root_overscroll().ToString());
    host_impl_->ScrollEnd();
    // TestCase to check  kEpsilon, which prevents minute values to trigger
    // gloweffect without reaching edge.
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(0, 0), InputHandler::Wheel));
    host_impl_->ScrollBy(gfx::Point(), gfx::Vector2dF(-0.12f, 0.1f));
    EXPECT_EQ(gfx::Vector2dF().ToString(),
              host_impl_->accumulated_root_overscroll().ToString());
    host_impl_->ScrollEnd();
  }
}

class BlendStateCheckLayer : public LayerImpl {
 public:
  static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl,
                                      int id,
                                      ResourceProvider* resource_provider) {
    return make_scoped_ptr(
        new BlendStateCheckLayer(tree_impl, id, resource_provider));
  }

  void AppendQuads(RenderPass* render_pass,
                   const Occlusion& occlusion_in_content_space,
                   AppendQuadsData* append_quads_data) override {
    quads_appended_ = true;

    gfx::Rect opaque_rect;
    if (contents_opaque())
      opaque_rect = quad_rect_;
    else
      opaque_rect = opaque_content_rect_;
    gfx::Rect visible_quad_rect = quad_rect_;

    SharedQuadState* shared_quad_state =
        render_pass->CreateAndAppendSharedQuadState();
    PopulateSharedQuadState(shared_quad_state);

    TileDrawQuad* test_blending_draw_quad =
        render_pass->CreateAndAppendDrawQuad<TileDrawQuad>();
    test_blending_draw_quad->SetNew(shared_quad_state,
                                    quad_rect_,
                                    opaque_rect,
                                    visible_quad_rect,
                                    resource_id_,
                                    gfx::RectF(0.f, 0.f, 1.f, 1.f),
                                    gfx::Size(1, 1),
                                    false,
                                    false);
    test_blending_draw_quad->visible_rect = quad_visible_rect_;
    EXPECT_EQ(blend_, test_blending_draw_quad->ShouldDrawWithBlending());
    EXPECT_EQ(has_render_surface_, !!render_surface());
  }

  void SetExpectation(bool blend, bool has_render_surface) {
    blend_ = blend;
    has_render_surface_ = has_render_surface;
    quads_appended_ = false;
  }

  bool quads_appended() const { return quads_appended_; }

  void SetQuadRect(const gfx::Rect& rect) { quad_rect_ = rect; }
  void SetQuadVisibleRect(const gfx::Rect& rect) { quad_visible_rect_ = rect; }
  void SetOpaqueContentRect(const gfx::Rect& rect) {
    opaque_content_rect_ = rect;
  }

 private:
  BlendStateCheckLayer(LayerTreeImpl* tree_impl,
                       int id,
                       ResourceProvider* resource_provider)
      : LayerImpl(tree_impl, id),
        blend_(false),
        has_render_surface_(false),
        quads_appended_(false),
        quad_rect_(5, 5, 5, 5),
        quad_visible_rect_(5, 5, 5, 5),
        resource_id_(resource_provider->CreateResource(
            gfx::Size(1, 1),
            GL_CLAMP_TO_EDGE,
            ResourceProvider::TextureHintImmutable,
            RGBA_8888)) {
    resource_provider->AllocateForTesting(resource_id_);
    SetBounds(gfx::Size(10, 10));
    SetContentBounds(gfx::Size(10, 10));
    SetDrawsContent(true);
  }

  bool blend_;
  bool has_render_surface_;
  bool quads_appended_;
  gfx::Rect quad_rect_;
  gfx::Rect opaque_content_rect_;
  gfx::Rect quad_visible_rect_;
  ResourceProvider::ResourceId resource_id_;
};

TEST_F(LayerTreeHostImplTest, BlendingOffWhenDrawingOpaqueLayers) {
  {
    scoped_ptr<LayerImpl> root =
        LayerImpl::Create(host_impl_->active_tree(), 1);
    root->SetBounds(gfx::Size(10, 10));
    root->SetContentBounds(root->bounds());
    root->SetDrawsContent(false);
    root->SetHasRenderSurface(true);
    host_impl_->active_tree()->SetRootLayer(root.Pass());
  }
  LayerImpl* root = host_impl_->active_tree()->root_layer();

  root->AddChild(
      BlendStateCheckLayer::Create(host_impl_->active_tree(),
                                   2,
                                   host_impl_->resource_provider()));
  BlendStateCheckLayer* layer1 =
      static_cast<BlendStateCheckLayer*>(root->children()[0]);
  layer1->SetPosition(gfx::PointF(2.f, 2.f));

  LayerTreeHostImpl::FrameData frame;

  // Opaque layer, drawn without blending.
  layer1->SetContentsOpaque(true);
  layer1->SetExpectation(false, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Layer with translucent content and painting, so drawn with blending.
  layer1->SetContentsOpaque(false);
  layer1->SetExpectation(true, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Layer with translucent opacity, drawn with blending.
  layer1->SetContentsOpaque(true);
  layer1->SetOpacity(0.5f);
  layer1->SetExpectation(true, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Layer with translucent opacity and painting, drawn with blending.
  layer1->SetContentsOpaque(true);
  layer1->SetOpacity(0.5f);
  layer1->SetExpectation(true, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  layer1->AddChild(
      BlendStateCheckLayer::Create(host_impl_->active_tree(),
                                   3,
                                   host_impl_->resource_provider()));
  BlendStateCheckLayer* layer2 =
      static_cast<BlendStateCheckLayer*>(layer1->children()[0]);
  layer2->SetPosition(gfx::PointF(4.f, 4.f));

  // 2 opaque layers, drawn without blending.
  layer1->SetContentsOpaque(true);
  layer1->SetOpacity(1.f);
  layer1->SetExpectation(false, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  layer2->SetContentsOpaque(true);
  layer2->SetOpacity(1.f);
  layer2->SetExpectation(false, false);
  layer2->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  EXPECT_TRUE(layer2->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Parent layer with translucent content, drawn with blending.
  // Child layer with opaque content, drawn without blending.
  layer1->SetContentsOpaque(false);
  layer1->SetExpectation(true, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  layer2->SetExpectation(false, false);
  layer2->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  EXPECT_TRUE(layer2->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Parent layer with translucent content but opaque painting, drawn without
  // blending.
  // Child layer with opaque content, drawn without blending.
  layer1->SetContentsOpaque(true);
  layer1->SetExpectation(false, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  layer2->SetExpectation(false, false);
  layer2->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  EXPECT_TRUE(layer2->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Parent layer with translucent opacity and opaque content. Since it has a
  // drawing child, it's drawn to a render surface which carries the opacity,
  // so it's itself drawn without blending.
  // Child layer with opaque content, drawn without blending (parent surface
  // carries the inherited opacity).
  layer1->SetContentsOpaque(true);
  layer1->SetOpacity(0.5f);
  layer1->SetHasRenderSurface(true);
  layer1->SetExpectation(false, true);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  layer2->SetExpectation(false, false);
  layer2->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  FakeLayerTreeHostImpl::RecursiveUpdateNumChildren(
      host_impl_->active_tree()->root_layer());
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  EXPECT_TRUE(layer2->quads_appended());
  host_impl_->DidDrawAllLayers(frame);
  layer1->SetHasRenderSurface(false);

  // Draw again, but with child non-opaque, to make sure
  // layer1 not culled.
  layer1->SetContentsOpaque(true);
  layer1->SetOpacity(1.f);
  layer1->SetExpectation(false, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  layer2->SetContentsOpaque(true);
  layer2->SetOpacity(0.5f);
  layer2->SetExpectation(true, false);
  layer2->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  EXPECT_TRUE(layer2->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // A second way of making the child non-opaque.
  layer1->SetContentsOpaque(true);
  layer1->SetOpacity(1.f);
  layer1->SetExpectation(false, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  layer2->SetContentsOpaque(false);
  layer2->SetOpacity(1.f);
  layer2->SetExpectation(true, false);
  layer2->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  EXPECT_TRUE(layer2->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // And when the layer says its not opaque but is painted opaque, it is not
  // blended.
  layer1->SetContentsOpaque(true);
  layer1->SetOpacity(1.f);
  layer1->SetExpectation(false, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  layer2->SetContentsOpaque(true);
  layer2->SetOpacity(1.f);
  layer2->SetExpectation(false, false);
  layer2->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  EXPECT_TRUE(layer2->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Layer with partially opaque contents, drawn with blending.
  layer1->SetContentsOpaque(false);
  layer1->SetQuadRect(gfx::Rect(5, 5, 5, 5));
  layer1->SetQuadVisibleRect(gfx::Rect(5, 5, 5, 5));
  layer1->SetOpaqueContentRect(gfx::Rect(5, 5, 2, 5));
  layer1->SetExpectation(true, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Layer with partially opaque contents partially culled, drawn with blending.
  layer1->SetContentsOpaque(false);
  layer1->SetQuadRect(gfx::Rect(5, 5, 5, 5));
  layer1->SetQuadVisibleRect(gfx::Rect(5, 5, 5, 2));
  layer1->SetOpaqueContentRect(gfx::Rect(5, 5, 2, 5));
  layer1->SetExpectation(true, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Layer with partially opaque contents culled, drawn with blending.
  layer1->SetContentsOpaque(false);
  layer1->SetQuadRect(gfx::Rect(5, 5, 5, 5));
  layer1->SetQuadVisibleRect(gfx::Rect(7, 5, 3, 5));
  layer1->SetOpaqueContentRect(gfx::Rect(5, 5, 2, 5));
  layer1->SetExpectation(true, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  host_impl_->DidDrawAllLayers(frame);

  // Layer with partially opaque contents and translucent contents culled, drawn
  // without blending.
  layer1->SetContentsOpaque(false);
  layer1->SetQuadRect(gfx::Rect(5, 5, 5, 5));
  layer1->SetQuadVisibleRect(gfx::Rect(5, 5, 2, 5));
  layer1->SetOpaqueContentRect(gfx::Rect(5, 5, 2, 5));
  layer1->SetExpectation(false, false);
  layer1->SetUpdateRect(gfx::Rect(layer1->content_bounds()));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(layer1->quads_appended());
  host_impl_->DidDrawAllLayers(frame);
}

class LayerTreeHostImplViewportCoveredTest : public LayerTreeHostImplTest {
 protected:
  LayerTreeHostImplViewportCoveredTest() :
      gutter_quad_material_(DrawQuad::SOLID_COLOR),
      child_(NULL),
      did_activate_pending_tree_(false) {}

  scoped_ptr<OutputSurface> CreateFakeOutputSurface(bool always_draw) {
    if (always_draw) {
      return FakeOutputSurface::CreateAlwaysDrawAndSwap3d();
    }
    return FakeOutputSurface::Create3d();
  }

  void SetupActiveTreeLayers() {
    host_impl_->active_tree()->set_background_color(SK_ColorGRAY);
    host_impl_->active_tree()->SetRootLayer(
        LayerImpl::Create(host_impl_->active_tree(), 1));
    host_impl_->active_tree()->root_layer()->SetHasRenderSurface(true);
    host_impl_->active_tree()->root_layer()->AddChild(
        BlendStateCheckLayer::Create(host_impl_->active_tree(),
                                     2,
                                     host_impl_->resource_provider()));
    child_ = static_cast<BlendStateCheckLayer*>(
        host_impl_->active_tree()->root_layer()->children()[0]);
    child_->SetExpectation(false, false);
    child_->SetContentsOpaque(true);
  }

  // Expect no gutter rects.
  void TestLayerCoversFullViewport() {
    gfx::Rect layer_rect(viewport_size_);
    child_->SetPosition(layer_rect.origin());
    child_->SetBounds(layer_rect.size());
    child_->SetContentBounds(layer_rect.size());
    child_->SetQuadRect(gfx::Rect(layer_rect.size()));
    child_->SetQuadVisibleRect(gfx::Rect(layer_rect.size()));

    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    ASSERT_EQ(1u, frame.render_passes.size());

    EXPECT_EQ(0u, CountGutterQuads(frame.render_passes[0]->quad_list));
    EXPECT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ValidateTextureDrawQuads(frame.render_passes[0]->quad_list);

    VerifyQuadsExactlyCoverViewport(frame.render_passes[0]->quad_list);
    host_impl_->DidDrawAllLayers(frame);
  }

  // Expect fullscreen gutter rect.
  void TestEmptyLayer() {
    gfx::Rect layer_rect(0, 0, 0, 0);
    child_->SetPosition(layer_rect.origin());
    child_->SetBounds(layer_rect.size());
    child_->SetContentBounds(layer_rect.size());
    child_->SetQuadRect(gfx::Rect(layer_rect.size()));
    child_->SetQuadVisibleRect(gfx::Rect(layer_rect.size()));

    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    ASSERT_EQ(1u, frame.render_passes.size());

    EXPECT_EQ(1u, CountGutterQuads(frame.render_passes[0]->quad_list));
    EXPECT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ValidateTextureDrawQuads(frame.render_passes[0]->quad_list);

    VerifyQuadsExactlyCoverViewport(frame.render_passes[0]->quad_list);
    host_impl_->DidDrawAllLayers(frame);
  }

  // Expect four surrounding gutter rects.
  void TestLayerInMiddleOfViewport() {
    gfx::Rect layer_rect(500, 500, 200, 200);
    child_->SetPosition(layer_rect.origin());
    child_->SetBounds(layer_rect.size());
    child_->SetContentBounds(layer_rect.size());
    child_->SetQuadRect(gfx::Rect(layer_rect.size()));
    child_->SetQuadVisibleRect(gfx::Rect(layer_rect.size()));

    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    ASSERT_EQ(1u, frame.render_passes.size());

    EXPECT_EQ(4u, CountGutterQuads(frame.render_passes[0]->quad_list));
    EXPECT_EQ(5u, frame.render_passes[0]->quad_list.size());
    ValidateTextureDrawQuads(frame.render_passes[0]->quad_list);

    VerifyQuadsExactlyCoverViewport(frame.render_passes[0]->quad_list);
    host_impl_->DidDrawAllLayers(frame);
  }

  // Expect no gutter rects.
  void TestLayerIsLargerThanViewport() {
    gfx::Rect layer_rect(viewport_size_.width() + 10,
                         viewport_size_.height() + 10);
    child_->SetPosition(layer_rect.origin());
    child_->SetBounds(layer_rect.size());
    child_->SetContentBounds(layer_rect.size());
    child_->SetQuadRect(gfx::Rect(layer_rect.size()));
    child_->SetQuadVisibleRect(gfx::Rect(layer_rect.size()));

    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    ASSERT_EQ(1u, frame.render_passes.size());

    EXPECT_EQ(0u, CountGutterQuads(frame.render_passes[0]->quad_list));
    EXPECT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ValidateTextureDrawQuads(frame.render_passes[0]->quad_list);

    host_impl_->DidDrawAllLayers(frame);
  }

  void DidActivateSyncTree() override { did_activate_pending_tree_ = true; }

  void set_gutter_quad_material(DrawQuad::Material material) {
    gutter_quad_material_ = material;
  }
  void set_gutter_texture_size(const gfx::Size& gutter_texture_size) {
    gutter_texture_size_ = gutter_texture_size;
  }

 protected:
  size_t CountGutterQuads(const QuadList& quad_list) {
    size_t num_gutter_quads = 0;
    for (const auto& quad : quad_list) {
      num_gutter_quads += (quad->material == gutter_quad_material_) ? 1 : 0;
    }
    return num_gutter_quads;
  }

  void VerifyQuadsExactlyCoverViewport(const QuadList& quad_list) {
    LayerTestCommon::VerifyQuadsExactlyCoverRect(
        quad_list, gfx::Rect(DipSizeToPixelSize(viewport_size_)));
  }

  // Make sure that the texture coordinates match their expectations.
  void ValidateTextureDrawQuads(const QuadList& quad_list) {
    for (const auto& quad : quad_list) {
      if (quad->material != DrawQuad::TEXTURE_CONTENT)
        continue;
      const TextureDrawQuad* texture_quad = TextureDrawQuad::MaterialCast(quad);
      gfx::SizeF gutter_texture_size_pixels = gfx::ScaleSize(
          gutter_texture_size_, host_impl_->device_scale_factor());
      EXPECT_EQ(texture_quad->uv_top_left.x(),
                texture_quad->rect.x() / gutter_texture_size_pixels.width());
      EXPECT_EQ(texture_quad->uv_top_left.y(),
                texture_quad->rect.y() / gutter_texture_size_pixels.height());
      EXPECT_EQ(
          texture_quad->uv_bottom_right.x(),
          texture_quad->rect.right() / gutter_texture_size_pixels.width());
      EXPECT_EQ(
          texture_quad->uv_bottom_right.y(),
          texture_quad->rect.bottom() / gutter_texture_size_pixels.height());
    }
  }

  gfx::Size DipSizeToPixelSize(const gfx::Size& size) {
    return gfx::ToRoundedSize(
        gfx::ScaleSize(size, host_impl_->device_scale_factor()));
  }

  DrawQuad::Material gutter_quad_material_;
  gfx::Size gutter_texture_size_;
  gfx::Size viewport_size_;
  BlendStateCheckLayer* child_;
  bool did_activate_pending_tree_;
};

TEST_F(LayerTreeHostImplViewportCoveredTest, ViewportCovered) {
  viewport_size_ = gfx::Size(1000, 1000);

  bool always_draw = false;
  CreateHostImpl(DefaultSettings(), CreateFakeOutputSurface(always_draw));

  host_impl_->SetViewportSize(DipSizeToPixelSize(viewport_size_));
  SetupActiveTreeLayers();
  TestLayerCoversFullViewport();
  TestEmptyLayer();
  TestLayerInMiddleOfViewport();
  TestLayerIsLargerThanViewport();
}

TEST_F(LayerTreeHostImplViewportCoveredTest, ViewportCoveredScaled) {
  viewport_size_ = gfx::Size(1000, 1000);

  bool always_draw = false;
  CreateHostImpl(DefaultSettings(), CreateFakeOutputSurface(always_draw));

  host_impl_->SetDeviceScaleFactor(2.f);
  host_impl_->SetViewportSize(DipSizeToPixelSize(viewport_size_));
  SetupActiveTreeLayers();
  TestLayerCoversFullViewport();
  TestEmptyLayer();
  TestLayerInMiddleOfViewport();
  TestLayerIsLargerThanViewport();
}

TEST_F(LayerTreeHostImplViewportCoveredTest, ActiveTreeGrowViewportInvalid) {
  viewport_size_ = gfx::Size(1000, 1000);

  bool always_draw = true;
  CreateHostImpl(DefaultSettings(), CreateFakeOutputSurface(always_draw));

  // Pending tree to force active_tree size invalid. Not used otherwise.
  host_impl_->CreatePendingTree();
  host_impl_->SetViewportSize(DipSizeToPixelSize(viewport_size_));
  EXPECT_TRUE(host_impl_->active_tree()->ViewportSizeInvalid());

  SetupActiveTreeLayers();
  TestEmptyLayer();
  TestLayerInMiddleOfViewport();
  TestLayerIsLargerThanViewport();
}

TEST_F(LayerTreeHostImplViewportCoveredTest, ActiveTreeShrinkViewportInvalid) {
  viewport_size_ = gfx::Size(1000, 1000);

  bool always_draw = true;
  CreateHostImpl(DefaultSettings(), CreateFakeOutputSurface(always_draw));

  // Set larger viewport and activate it to active tree.
  host_impl_->CreatePendingTree();
  gfx::Size larger_viewport(viewport_size_.width() + 100,
                            viewport_size_.height() + 100);
  host_impl_->SetViewportSize(DipSizeToPixelSize(larger_viewport));
  EXPECT_TRUE(host_impl_->active_tree()->ViewportSizeInvalid());
  host_impl_->ActivateSyncTree();
  EXPECT_TRUE(did_activate_pending_tree_);
  EXPECT_FALSE(host_impl_->active_tree()->ViewportSizeInvalid());

  // Shrink pending tree viewport without activating.
  host_impl_->CreatePendingTree();
  host_impl_->SetViewportSize(DipSizeToPixelSize(viewport_size_));
  EXPECT_TRUE(host_impl_->active_tree()->ViewportSizeInvalid());

  SetupActiveTreeLayers();
  TestEmptyLayer();
  TestLayerInMiddleOfViewport();
  TestLayerIsLargerThanViewport();
}

class FakeDrawableLayerImpl: public LayerImpl {
 public:
  static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
    return make_scoped_ptr(new FakeDrawableLayerImpl(tree_impl, id));
  }
 protected:
  FakeDrawableLayerImpl(LayerTreeImpl* tree_impl, int id)
      : LayerImpl(tree_impl, id) {}
};

// Only reshape when we know we are going to draw. Otherwise, the reshape
// can leave the window at the wrong size if we never draw and the proper
// viewport size is never set.
TEST_F(LayerTreeHostImplTest, ReshapeNotCalledUntilDraw) {
  scoped_refptr<TestContextProvider> provider(TestContextProvider::Create());
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(provider));
  CreateHostImpl(DefaultSettings(), output_surface.Pass());

  scoped_ptr<LayerImpl> root =
      FakeDrawableLayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetBounds(gfx::Size(10, 10));
  root->SetContentBounds(gfx::Size(10, 10));
  root->SetDrawsContent(true);
  root->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  EXPECT_FALSE(provider->TestContext3d()->reshape_called());
  provider->TestContext3d()->clear_reshape_called();

  LayerTreeHostImpl::FrameData frame;
  host_impl_->SetViewportSize(gfx::Size(10, 10));
  host_impl_->SetDeviceScaleFactor(1.f);
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(provider->TestContext3d()->reshape_called());
  EXPECT_EQ(provider->TestContext3d()->width(), 10);
  EXPECT_EQ(provider->TestContext3d()->height(), 10);
  EXPECT_EQ(provider->TestContext3d()->scale_factor(), 1.f);
  host_impl_->DidDrawAllLayers(frame);
  provider->TestContext3d()->clear_reshape_called();

  host_impl_->SetViewportSize(gfx::Size(20, 30));
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(provider->TestContext3d()->reshape_called());
  EXPECT_EQ(provider->TestContext3d()->width(), 20);
  EXPECT_EQ(provider->TestContext3d()->height(), 30);
  EXPECT_EQ(provider->TestContext3d()->scale_factor(), 1.f);
  host_impl_->DidDrawAllLayers(frame);
  provider->TestContext3d()->clear_reshape_called();

  host_impl_->SetDeviceScaleFactor(2.f);
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  EXPECT_TRUE(provider->TestContext3d()->reshape_called());
  EXPECT_EQ(provider->TestContext3d()->width(), 20);
  EXPECT_EQ(provider->TestContext3d()->height(), 30);
  EXPECT_EQ(provider->TestContext3d()->scale_factor(), 2.f);
  host_impl_->DidDrawAllLayers(frame);
  provider->TestContext3d()->clear_reshape_called();
}

// Make sure damage tracking propagates all the way to the graphics context,
// where it should request to swap only the sub-buffer that is damaged.
TEST_F(LayerTreeHostImplTest, PartialSwapReceivesDamageRect) {
  scoped_refptr<TestContextProvider> context_provider(
      TestContextProvider::Create());
  context_provider->BindToCurrentThread();
  context_provider->TestContext3d()->set_have_post_sub_buffer(true);

  scoped_ptr<FakeOutputSurface> output_surface(
      FakeOutputSurface::Create3d(context_provider));
  FakeOutputSurface* fake_output_surface = output_surface.get();

  // This test creates its own LayerTreeHostImpl, so
  // that we can force partial swap enabled.
  LayerTreeSettings settings;
  settings.renderer_settings.partial_swap_enabled = true;
  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<LayerTreeHostImpl> layer_tree_host_impl =
      LayerTreeHostImpl::Create(settings,
                                this,
                                &proxy_,
                                &stats_instrumentation_,
                                shared_bitmap_manager.get(),
                                NULL,
                                0);
  layer_tree_host_impl->InitializeRenderer(output_surface.Pass());
  layer_tree_host_impl->SetViewportSize(gfx::Size(500, 500));

  scoped_ptr<LayerImpl> root =
      FakeDrawableLayerImpl::Create(layer_tree_host_impl->active_tree(), 1);
  root->SetHasRenderSurface(true);
  scoped_ptr<LayerImpl> child =
      FakeDrawableLayerImpl::Create(layer_tree_host_impl->active_tree(), 2);
  child->SetPosition(gfx::PointF(12.f, 13.f));
  child->SetBounds(gfx::Size(14, 15));
  child->SetContentBounds(gfx::Size(14, 15));
  child->SetDrawsContent(true);
  root->SetBounds(gfx::Size(500, 500));
  root->SetContentBounds(gfx::Size(500, 500));
  root->SetDrawsContent(true);
  root->AddChild(child.Pass());
  layer_tree_host_impl->active_tree()->SetRootLayer(root.Pass());

  LayerTreeHostImpl::FrameData frame;

  // First frame, the entire screen should get swapped.
  EXPECT_EQ(DRAW_SUCCESS, layer_tree_host_impl->PrepareToDraw(&frame));
  layer_tree_host_impl->DrawLayers(&frame, gfx::FrameTime::Now());
  layer_tree_host_impl->DidDrawAllLayers(frame);
  layer_tree_host_impl->SwapBuffers(frame);
  gfx::Rect expected_swap_rect(0, 0, 500, 500);
  EXPECT_EQ(expected_swap_rect.ToString(),
            fake_output_surface->last_swap_rect().ToString());

  // Second frame, only the damaged area should get swapped. Damage should be
  // the union of old and new child rects.
  // expected damage rect: gfx::Rect(26, 28);
  // expected swap rect: vertically flipped, with origin at bottom left corner.
  layer_tree_host_impl->active_tree()->root_layer()->children()[0]->SetPosition(
      gfx::PointF());
  EXPECT_EQ(DRAW_SUCCESS, layer_tree_host_impl->PrepareToDraw(&frame));
  layer_tree_host_impl->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  layer_tree_host_impl->SwapBuffers(frame);

  // Make sure that partial swap is constrained to the viewport dimensions
  // expected damage rect: gfx::Rect(500, 500);
  // expected swap rect: flipped damage rect, but also clamped to viewport
  expected_swap_rect = gfx::Rect(0, 500-28, 26, 28);
  EXPECT_EQ(expected_swap_rect.ToString(),
            fake_output_surface->last_swap_rect().ToString());

  layer_tree_host_impl->SetViewportSize(gfx::Size(10, 10));
  // This will damage everything.
  layer_tree_host_impl->active_tree()->root_layer()->SetBackgroundColor(
      SK_ColorBLACK);
  EXPECT_EQ(DRAW_SUCCESS, layer_tree_host_impl->PrepareToDraw(&frame));
  layer_tree_host_impl->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  layer_tree_host_impl->SwapBuffers(frame);

  expected_swap_rect = gfx::Rect(0, 0, 10, 10);
  EXPECT_EQ(expected_swap_rect.ToString(),
            fake_output_surface->last_swap_rect().ToString());
}

TEST_F(LayerTreeHostImplTest, RootLayerDoesntCreateExtraSurface) {
  scoped_ptr<LayerImpl> root =
      FakeDrawableLayerImpl::Create(host_impl_->active_tree(), 1);
  scoped_ptr<LayerImpl> child =
      FakeDrawableLayerImpl::Create(host_impl_->active_tree(), 2);
  child->SetBounds(gfx::Size(10, 10));
  child->SetContentBounds(gfx::Size(10, 10));
  child->SetDrawsContent(true);
  root->SetBounds(gfx::Size(10, 10));
  root->SetContentBounds(gfx::Size(10, 10));
  root->SetDrawsContent(true);
  root->SetHasRenderSurface(true);
  root->AddChild(child.Pass());

  host_impl_->active_tree()->SetRootLayer(root.Pass());

  LayerTreeHostImpl::FrameData frame;

  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  EXPECT_EQ(1u, frame.render_surface_layer_list->size());
  EXPECT_EQ(1u, frame.render_passes.size());
  host_impl_->DidDrawAllLayers(frame);
}

class FakeLayerWithQuads : public LayerImpl {
 public:
  static scoped_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
    return make_scoped_ptr(new FakeLayerWithQuads(tree_impl, id));
  }

  void AppendQuads(RenderPass* render_pass,
                   const Occlusion& occlusion_in_content_space,
                   AppendQuadsData* append_quads_data) override {
    SharedQuadState* shared_quad_state =
        render_pass->CreateAndAppendSharedQuadState();
    PopulateSharedQuadState(shared_quad_state);

    SkColor gray = SkColorSetRGB(100, 100, 100);
    gfx::Rect quad_rect(content_bounds());
    gfx::Rect visible_quad_rect(quad_rect);
    SolidColorDrawQuad* my_quad =
        render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
    my_quad->SetNew(
        shared_quad_state, quad_rect, visible_quad_rect, gray, false);
  }

 private:
  FakeLayerWithQuads(LayerTreeImpl* tree_impl, int id)
      : LayerImpl(tree_impl, id) {}
};

class MockContext : public TestWebGraphicsContext3D {
 public:
  MOCK_METHOD1(useProgram, void(GLuint program));
  MOCK_METHOD5(uniform4f, void(GLint location,
                               GLfloat x,
                               GLfloat y,
                               GLfloat z,
                               GLfloat w));
  MOCK_METHOD4(uniformMatrix4fv, void(GLint location,
                                      GLsizei count,
                                      GLboolean transpose,
                                      const GLfloat* value));
  MOCK_METHOD4(drawElements, void(GLenum mode,
                                  GLsizei count,
                                  GLenum type,
                                  GLintptr offset));
  MOCK_METHOD1(enable, void(GLenum cap));
  MOCK_METHOD1(disable, void(GLenum cap));
  MOCK_METHOD4(scissor, void(GLint x,
                             GLint y,
                             GLsizei width,
                             GLsizei height));
};

class MockContextHarness {
 private:
  MockContext* context_;

 public:
  explicit MockContextHarness(MockContext* context)
      : context_(context) {
    context_->set_have_post_sub_buffer(true);

    // Catch "uninteresting" calls
    EXPECT_CALL(*context_, useProgram(_))
        .Times(0);

    EXPECT_CALL(*context_, drawElements(_, _, _, _))
        .Times(0);

    // These are not asserted
    EXPECT_CALL(*context_, uniformMatrix4fv(_, _, _, _))
        .WillRepeatedly(Return());

    EXPECT_CALL(*context_, uniform4f(_, _, _, _, _))
        .WillRepeatedly(Return());

    // Any un-sanctioned calls to enable() are OK
    EXPECT_CALL(*context_, enable(_))
        .WillRepeatedly(Return());

    // Any un-sanctioned calls to disable() are OK
    EXPECT_CALL(*context_, disable(_))
        .WillRepeatedly(Return());
  }

  void MustDrawSolidQuad() {
    EXPECT_CALL(*context_, drawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0))
        .WillOnce(Return())
        .RetiresOnSaturation();

    EXPECT_CALL(*context_, useProgram(_))
        .WillOnce(Return())
        .RetiresOnSaturation();
  }

  void MustSetScissor(int x, int y, int width, int height) {
    EXPECT_CALL(*context_, enable(GL_SCISSOR_TEST))
        .WillRepeatedly(Return());

    EXPECT_CALL(*context_, scissor(x, y, width, height))
        .Times(AtLeast(1))
        .WillRepeatedly(Return());
  }

  void MustSetNoScissor() {
    EXPECT_CALL(*context_, disable(GL_SCISSOR_TEST))
        .WillRepeatedly(Return());

    EXPECT_CALL(*context_, enable(GL_SCISSOR_TEST))
        .Times(0);

    EXPECT_CALL(*context_, scissor(_, _, _, _))
        .Times(0);
  }
};

TEST_F(LayerTreeHostImplTest, NoPartialSwap) {
  scoped_ptr<MockContext> mock_context_owned(new MockContext);
  MockContext* mock_context = mock_context_owned.get();
  MockContextHarness harness(mock_context);

  // Run test case
  LayerTreeSettings settings = DefaultSettings();
  settings.renderer_settings.partial_swap_enabled = false;
  CreateHostImpl(settings,
                 FakeOutputSurface::Create3d(mock_context_owned.Pass()));
  SetupRootLayerImpl(FakeLayerWithQuads::Create(host_impl_->active_tree(), 1));

  // Without partial swap, and no clipping, no scissor is set.
  harness.MustDrawSolidQuad();
  harness.MustSetNoScissor();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
  Mock::VerifyAndClearExpectations(&mock_context);

  // Without partial swap, but a layer does clip its subtree, one scissor is
  // set.
  host_impl_->active_tree()->root_layer()->SetMasksToBounds(true);
  harness.MustDrawSolidQuad();
  harness.MustSetScissor(0, 0, 10, 10);
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
  Mock::VerifyAndClearExpectations(&mock_context);
}

TEST_F(LayerTreeHostImplTest, PartialSwap) {
  scoped_ptr<MockContext> context_owned(new MockContext);
  MockContext* mock_context = context_owned.get();
  MockContextHarness harness(mock_context);

  LayerTreeSettings settings = DefaultSettings();
  settings.renderer_settings.partial_swap_enabled = true;
  CreateHostImpl(settings, FakeOutputSurface::Create3d(context_owned.Pass()));
  SetupRootLayerImpl(FakeLayerWithQuads::Create(host_impl_->active_tree(), 1));

  // The first frame is not a partially-swapped one.
  harness.MustSetScissor(0, 0, 10, 10);
  harness.MustDrawSolidQuad();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
  Mock::VerifyAndClearExpectations(&mock_context);

  // Damage a portion of the frame.
  host_impl_->active_tree()->root_layer()->SetUpdateRect(
      gfx::Rect(0, 0, 2, 3));

  // The second frame will be partially-swapped (the y coordinates are flipped).
  harness.MustSetScissor(0, 7, 2, 3);
  harness.MustDrawSolidQuad();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
  Mock::VerifyAndClearExpectations(&mock_context);
}

static scoped_ptr<LayerTreeHostImpl> SetupLayersForOpacity(
    bool partial_swap,
    LayerTreeHostImplClient* client,
    Proxy* proxy,
    SharedBitmapManager* manager,
    RenderingStatsInstrumentation* stats_instrumentation) {
  scoped_refptr<TestContextProvider> provider(TestContextProvider::Create());
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(provider));
  provider->BindToCurrentThread();
  provider->TestContext3d()->set_have_post_sub_buffer(true);

  LayerTreeSettings settings;
  settings.renderer_settings.partial_swap_enabled = partial_swap;
  scoped_ptr<LayerTreeHostImpl> my_host_impl = LayerTreeHostImpl::Create(
      settings, client, proxy, stats_instrumentation, manager, NULL, 0);
  my_host_impl->InitializeRenderer(output_surface.Pass());
  my_host_impl->SetViewportSize(gfx::Size(100, 100));

  /*
    Layers are created as follows:

    +--------------------+
    |                  1 |
    |  +-----------+     |
    |  |         2 |     |
    |  | +-------------------+
    |  | |   3               |
    |  | +-------------------+
    |  |           |     |
    |  +-----------+     |
    |                    |
    |                    |
    +--------------------+

    Layers 1, 2 have render surfaces
  */
  scoped_ptr<LayerImpl> root =
      LayerImpl::Create(my_host_impl->active_tree(), 1);
  scoped_ptr<LayerImpl> child =
      LayerImpl::Create(my_host_impl->active_tree(), 2);
  scoped_ptr<LayerImpl> grand_child =
      FakeLayerWithQuads::Create(my_host_impl->active_tree(), 3);

  gfx::Rect root_rect(0, 0, 100, 100);
  gfx::Rect child_rect(10, 10, 50, 50);
  gfx::Rect grand_child_rect(5, 5, 150, 150);

  root->SetHasRenderSurface(true);
  root->SetPosition(root_rect.origin());
  root->SetBounds(root_rect.size());
  root->SetContentBounds(root->bounds());
  root->draw_properties().visible_content_rect = root_rect;
  root->SetDrawsContent(false);
  root->render_surface()->SetContentRect(gfx::Rect(root_rect.size()));

  child->SetPosition(gfx::PointF(child_rect.x(), child_rect.y()));
  child->SetOpacity(0.5f);
  child->SetBounds(gfx::Size(child_rect.width(), child_rect.height()));
  child->SetContentBounds(child->bounds());
  child->draw_properties().visible_content_rect = child_rect;
  child->SetDrawsContent(false);
  child->SetHasRenderSurface(true);

  grand_child->SetPosition(grand_child_rect.origin());
  grand_child->SetBounds(grand_child_rect.size());
  grand_child->SetContentBounds(grand_child->bounds());
  grand_child->draw_properties().visible_content_rect = grand_child_rect;
  grand_child->SetDrawsContent(true);

  child->AddChild(grand_child.Pass());
  root->AddChild(child.Pass());

  my_host_impl->active_tree()->SetRootLayer(root.Pass());
  return my_host_impl.Pass();
}

TEST_F(LayerTreeHostImplTest, ContributingLayerEmptyScissorPartialSwap) {
  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<LayerTreeHostImpl> my_host_impl =
      SetupLayersForOpacity(true,
                            this,
                            &proxy_,
                            shared_bitmap_manager.get(),
                            &stats_instrumentation_);
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, my_host_impl->PrepareToDraw(&frame));

    // Verify all quads have been computed
    ASSERT_EQ(2U, frame.render_passes.size());
    ASSERT_EQ(1U, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(1U, frame.render_passes[1]->quad_list.size());
    EXPECT_EQ(DrawQuad::SOLID_COLOR,
              frame.render_passes[0]->quad_list.front()->material);
    EXPECT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[1]->quad_list.front()->material);

    my_host_impl->DrawLayers(&frame, gfx::FrameTime::Now());
    my_host_impl->DidDrawAllLayers(frame);
  }
}

TEST_F(LayerTreeHostImplTest, ContributingLayerEmptyScissorNoPartialSwap) {
  scoped_ptr<SharedBitmapManager> shared_bitmap_manager(
      new TestSharedBitmapManager());
  scoped_ptr<LayerTreeHostImpl> my_host_impl =
      SetupLayersForOpacity(false,
                            this,
                            &proxy_,
                            shared_bitmap_manager.get(),
                            &stats_instrumentation_);
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, my_host_impl->PrepareToDraw(&frame));

    // Verify all quads have been computed
    ASSERT_EQ(2U, frame.render_passes.size());
    ASSERT_EQ(1U, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(1U, frame.render_passes[1]->quad_list.size());
    EXPECT_EQ(DrawQuad::SOLID_COLOR,
              frame.render_passes[0]->quad_list.front()->material);
    EXPECT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[1]->quad_list.front()->material);

    my_host_impl->DrawLayers(&frame, gfx::FrameTime::Now());
    my_host_impl->DidDrawAllLayers(frame);
  }
}

TEST_F(LayerTreeHostImplTest, LayersFreeTextures) {
  scoped_ptr<TestWebGraphicsContext3D> context =
      TestWebGraphicsContext3D::Create();
  TestWebGraphicsContext3D* context3d = context.get();
  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(context.Pass()));
  CreateHostImpl(DefaultSettings(), output_surface.Pass());

  scoped_ptr<LayerImpl> root_layer =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  root_layer->SetBounds(gfx::Size(10, 10));
  root_layer->SetHasRenderSurface(true);

  scoped_ptr<IOSurfaceLayerImpl> io_surface_layer =
      IOSurfaceLayerImpl::Create(host_impl_->active_tree(), 5);
  io_surface_layer->SetBounds(gfx::Size(10, 10));
  io_surface_layer->SetContentBounds(gfx::Size(10, 10));
  io_surface_layer->SetDrawsContent(true);
  io_surface_layer->SetIOSurfaceProperties(1, gfx::Size(10, 10));
  root_layer->AddChild(io_surface_layer.Pass());

  host_impl_->active_tree()->SetRootLayer(root_layer.Pass());

  EXPECT_EQ(0u, context3d->NumTextures());

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  host_impl_->SwapBuffers(frame);

  EXPECT_GT(context3d->NumTextures(), 0u);

  // Kill the layer tree.
  host_impl_->active_tree()->SetRootLayer(
      LayerImpl::Create(host_impl_->active_tree(), 100));
  // There should be no textures left in use after.
  EXPECT_EQ(0u, context3d->NumTextures());
}

class MockDrawQuadsToFillScreenContext : public TestWebGraphicsContext3D {
 public:
  MOCK_METHOD1(useProgram, void(GLuint program));
  MOCK_METHOD4(drawElements, void(GLenum mode,
                                  GLsizei count,
                                  GLenum type,
                                  GLintptr offset));
};

TEST_F(LayerTreeHostImplTest, HasTransparentBackground) {
  scoped_ptr<MockDrawQuadsToFillScreenContext> mock_context_owned(
      new MockDrawQuadsToFillScreenContext);
  MockDrawQuadsToFillScreenContext* mock_context = mock_context_owned.get();

  // Run test case
  LayerTreeSettings settings = DefaultSettings();
  settings.renderer_settings.partial_swap_enabled = false;
  CreateHostImpl(settings,
                 FakeOutputSurface::Create3d(mock_context_owned.Pass()));
  SetupRootLayerImpl(LayerImpl::Create(host_impl_->active_tree(), 1));
  host_impl_->active_tree()->set_background_color(SK_ColorWHITE);

  // Verify one quad is drawn when transparent background set is not set.
  host_impl_->active_tree()->set_has_transparent_background(false);
  EXPECT_CALL(*mock_context, useProgram(_))
      .Times(1);
  EXPECT_CALL(*mock_context, drawElements(_, _, _, _))
      .Times(1);
  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  Mock::VerifyAndClearExpectations(&mock_context);

  // Verify no quads are drawn when transparent background is set.
  host_impl_->active_tree()->set_has_transparent_background(true);
  host_impl_->SetFullRootLayerDamage();
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  Mock::VerifyAndClearExpectations(&mock_context);
}

TEST_F(LayerTreeHostImplTest, ReleaseContentsTextureShouldTriggerCommit) {
  set_reduce_memory_result(false);

  // If changing the memory limit wouldn't result in changing what was
  // committed, then no commit should be requested.
  set_reduce_memory_result(false);
  host_impl_->set_max_memory_needed_bytes(
      host_impl_->memory_allocation_limit_bytes() - 1);
  host_impl_->SetMemoryPolicy(ManagedMemoryPolicy(
      host_impl_->memory_allocation_limit_bytes() - 1));
  EXPECT_FALSE(did_request_commit_);
  did_request_commit_ = false;

  // If changing the memory limit would result in changing what was
  // committed, then a commit should be requested, even though nothing was
  // evicted.
  set_reduce_memory_result(false);
  host_impl_->set_max_memory_needed_bytes(
      host_impl_->memory_allocation_limit_bytes());
  host_impl_->SetMemoryPolicy(ManagedMemoryPolicy(
      host_impl_->memory_allocation_limit_bytes() - 1));
  EXPECT_TRUE(did_request_commit_);
  did_request_commit_ = false;

  // Especially if changing the memory limit caused evictions, we need
  // to re-commit.
  set_reduce_memory_result(true);
  host_impl_->set_max_memory_needed_bytes(1);
  host_impl_->SetMemoryPolicy(ManagedMemoryPolicy(
      host_impl_->memory_allocation_limit_bytes() - 1));
  EXPECT_TRUE(did_request_commit_);
  did_request_commit_ = false;

  // But if we set it to the same value that it was before, we shouldn't
  // re-commit.
  host_impl_->SetMemoryPolicy(ManagedMemoryPolicy(
      host_impl_->memory_allocation_limit_bytes()));
  EXPECT_FALSE(did_request_commit_);
}

class LayerTreeHostImplTestWithDelegatingRenderer
    : public LayerTreeHostImplTest {
 protected:
  scoped_ptr<OutputSurface> CreateOutputSurface() override {
    return FakeOutputSurface::CreateDelegating3d();
  }

  void DrawFrameAndTestDamage(const gfx::RectF& expected_damage) {
    bool expect_to_draw = !expected_damage.IsEmpty();

    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    if (!expect_to_draw) {
      // With no damage, we don't draw, and no quads are created.
      ASSERT_EQ(0u, frame.render_passes.size());
    } else {
      ASSERT_EQ(1u, frame.render_passes.size());

      // Verify the damage rect for the root render pass.
      const RenderPass* root_render_pass = frame.render_passes.back();
      EXPECT_EQ(expected_damage, root_render_pass->damage_rect);

      // Verify the root and child layers' quads are generated and not being
      // culled.
      ASSERT_EQ(2u, root_render_pass->quad_list.size());

      LayerImpl* child = host_impl_->active_tree()->root_layer()->children()[0];
      gfx::RectF expected_child_visible_rect(child->content_bounds());
      EXPECT_EQ(expected_child_visible_rect,
                root_render_pass->quad_list.front()->visible_rect);

      LayerImpl* root = host_impl_->active_tree()->root_layer();
      gfx::RectF expected_root_visible_rect(root->content_bounds());
      EXPECT_EQ(expected_root_visible_rect,
                root_render_pass->quad_list.ElementAt(1)->visible_rect);
    }

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
    EXPECT_EQ(expect_to_draw, host_impl_->SwapBuffers(frame));
  }
};

TEST_F(LayerTreeHostImplTestWithDelegatingRenderer, FrameIncludesDamageRect) {
  scoped_ptr<SolidColorLayerImpl> root =
      SolidColorLayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetPosition(gfx::PointF());
  root->SetBounds(gfx::Size(10, 10));
  root->SetContentBounds(gfx::Size(10, 10));
  root->SetDrawsContent(true);
  root->SetHasRenderSurface(true);

  // Child layer is in the bottom right corner.
  scoped_ptr<SolidColorLayerImpl> child =
      SolidColorLayerImpl::Create(host_impl_->active_tree(), 2);
  child->SetPosition(gfx::PointF(9.f, 9.f));
  child->SetBounds(gfx::Size(1, 1));
  child->SetContentBounds(gfx::Size(1, 1));
  child->SetDrawsContent(true);
  root->AddChild(child.Pass());

  host_impl_->active_tree()->SetRootLayer(root.Pass());

  // Draw a frame. In the first frame, the entire viewport should be damaged.
  gfx::Rect full_frame_damage(host_impl_->DrawViewportSize());
  DrawFrameAndTestDamage(full_frame_damage);

  // The second frame has damage that doesn't touch the child layer. Its quads
  // should still be generated.
  gfx::Rect small_damage = gfx::Rect(0, 0, 1, 1);
  host_impl_->active_tree()->root_layer()->SetUpdateRect(small_damage);
  DrawFrameAndTestDamage(small_damage);

  // The third frame should have no damage, so no quads should be generated.
  gfx::Rect no_damage;
  DrawFrameAndTestDamage(no_damage);
}

// TODO(reveman): Remove this test and the ability to prevent on demand raster
// when delegating renderer supports PictureDrawQuads. crbug.com/342121
TEST_F(LayerTreeHostImplTestWithDelegatingRenderer, PreventRasterizeOnDemand) {
  LayerTreeSettings settings;
  CreateHostImpl(settings, CreateOutputSurface());
  EXPECT_FALSE(host_impl_->GetRendererCapabilities().allow_rasterize_on_demand);
}

class FakeMaskLayerImpl : public LayerImpl {
 public:
  static scoped_ptr<FakeMaskLayerImpl> Create(LayerTreeImpl* tree_impl,
                                              int id) {
    return make_scoped_ptr(new FakeMaskLayerImpl(tree_impl, id));
  }

  void GetContentsResourceId(ResourceProvider::ResourceId* resource_id,
                             gfx::Size* resource_size) const override {
    *resource_id = 0;
  }

 private:
  FakeMaskLayerImpl(LayerTreeImpl* tree_impl, int id)
      : LayerImpl(tree_impl, id) {}
};

TEST_F(LayerTreeHostImplTest, MaskLayerWithScaling) {
  LayerTreeSettings settings;
  settings.layer_transforms_should_scale_layer_contents = true;
  CreateHostImpl(settings, CreateOutputSurface());

  // Root
  //  |
  //  +-- Scaling Layer (adds a 2x scale)
  //       |
  //       +-- Content Layer
  //             +--Mask
  scoped_ptr<LayerImpl> scoped_root =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  LayerImpl* root = scoped_root.get();
  root->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(scoped_root.Pass());

  scoped_ptr<LayerImpl> scoped_scaling_layer =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  LayerImpl* scaling_layer = scoped_scaling_layer.get();
  root->AddChild(scoped_scaling_layer.Pass());

  scoped_ptr<LayerImpl> scoped_content_layer =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  LayerImpl* content_layer = scoped_content_layer.get();
  scaling_layer->AddChild(scoped_content_layer.Pass());

  scoped_ptr<FakeMaskLayerImpl> scoped_mask_layer =
      FakeMaskLayerImpl::Create(host_impl_->active_tree(), 4);
  FakeMaskLayerImpl* mask_layer = scoped_mask_layer.get();
  content_layer->SetHasRenderSurface(true);
  content_layer->SetMaskLayer(scoped_mask_layer.Pass());

  gfx::Size root_size(100, 100);
  root->SetBounds(root_size);
  root->SetContentBounds(root_size);
  root->SetPosition(gfx::PointF());

  gfx::Size scaling_layer_size(50, 50);
  scaling_layer->SetBounds(scaling_layer_size);
  scaling_layer->SetContentBounds(scaling_layer_size);
  scaling_layer->SetPosition(gfx::PointF());
  gfx::Transform scale;
  scale.Scale(2.f, 2.f);
  scaling_layer->SetTransform(scale);

  content_layer->SetBounds(scaling_layer_size);
  content_layer->SetContentBounds(scaling_layer_size);
  content_layer->SetPosition(gfx::PointF());
  content_layer->SetDrawsContent(true);

  mask_layer->SetBounds(scaling_layer_size);
  mask_layer->SetContentBounds(scaling_layer_size);
  mask_layer->SetPosition(gfx::PointF());
  mask_layer->SetDrawsContent(true);


  // Check that the tree scaling is correctly taken into account for the mask,
  // that should fully map onto the quad.
  float device_scale_factor = 1.f;
  host_impl_->SetViewportSize(root_size);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(0, 0, 100, 100).ToString(),
              render_pass_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              render_pass_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              render_pass_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }


  // Applying a DSF should change the render surface size, but won't affect
  // which part of the mask is used.
  device_scale_factor = 2.f;
  gfx::Size device_viewport =
      gfx::ToFlooredSize(gfx::ScaleSize(root_size, device_scale_factor));
  host_impl_->SetViewportSize(device_viewport);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  host_impl_->active_tree()->set_needs_update_draw_properties();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(0, 0, 200, 200).ToString(),
              render_pass_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              render_pass_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              render_pass_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }


  // Applying an equivalent content scale on the content layer and the mask
  // should still result in the same part of the mask being used.
  gfx::Size content_bounds =
      gfx::ToRoundedSize(gfx::ScaleSize(scaling_layer_size,
                                        device_scale_factor));
  content_layer->SetContentBounds(content_bounds);
  content_layer->SetContentsScale(device_scale_factor, device_scale_factor);
  mask_layer->SetContentBounds(content_bounds);
  mask_layer->SetContentsScale(device_scale_factor, device_scale_factor);
  host_impl_->active_tree()->set_needs_update_draw_properties();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(0, 0, 200, 200).ToString(),
              render_pass_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              render_pass_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              render_pass_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
}

TEST_F(LayerTreeHostImplTest, MaskLayerWithDifferentBounds) {
  // The mask layer has bounds 100x100 but is attached to a layer with bounds
  // 50x50.

  scoped_ptr<LayerImpl> scoped_root =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  LayerImpl* root = scoped_root.get();
  root->SetHasRenderSurface(true);

  host_impl_->active_tree()->SetRootLayer(scoped_root.Pass());

  scoped_ptr<LayerImpl> scoped_content_layer =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  LayerImpl* content_layer = scoped_content_layer.get();
  root->AddChild(scoped_content_layer.Pass());

  scoped_ptr<FakeMaskLayerImpl> scoped_mask_layer =
      FakeMaskLayerImpl::Create(host_impl_->active_tree(), 4);
  FakeMaskLayerImpl* mask_layer = scoped_mask_layer.get();
  content_layer->SetMaskLayer(scoped_mask_layer.Pass());
  content_layer->SetHasRenderSurface(true);

  gfx::Size root_size(100, 100);
  root->SetBounds(root_size);
  root->SetContentBounds(root_size);
  root->SetPosition(gfx::PointF());

  gfx::Size layer_size(50, 50);
  content_layer->SetBounds(layer_size);
  content_layer->SetContentBounds(layer_size);
  content_layer->SetPosition(gfx::PointF());
  content_layer->SetDrawsContent(true);

  gfx::Size mask_size(100, 100);
  mask_layer->SetBounds(mask_size);
  mask_layer->SetContentBounds(mask_size);
  mask_layer->SetPosition(gfx::PointF());
  mask_layer->SetDrawsContent(true);

  // Check that the mask fills the surface.
  float device_scale_factor = 1.f;
  host_impl_->SetViewportSize(root_size);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(0, 0, 50, 50).ToString(),
              render_pass_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              render_pass_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              render_pass_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }

  // Applying a DSF should change the render surface size, but won't affect
  // which part of the mask is used.
  device_scale_factor = 2.f;
  gfx::Size device_viewport =
      gfx::ToFlooredSize(gfx::ScaleSize(root_size, device_scale_factor));
  host_impl_->SetViewportSize(device_viewport);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  host_impl_->active_tree()->set_needs_update_draw_properties();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(0, 0, 100, 100).ToString(),
              render_pass_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              render_pass_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              render_pass_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }

  // Applying an equivalent content scale on the content layer and the mask
  // should still result in the same part of the mask being used.
  gfx::Size layer_size_large =
      gfx::ToRoundedSize(gfx::ScaleSize(layer_size, device_scale_factor));
  content_layer->SetContentBounds(layer_size_large);
  content_layer->SetContentsScale(device_scale_factor, device_scale_factor);
  gfx::Size mask_size_large =
      gfx::ToRoundedSize(gfx::ScaleSize(mask_size, device_scale_factor));
  mask_layer->SetContentBounds(mask_size_large);
  mask_layer->SetContentsScale(device_scale_factor, device_scale_factor);
  host_impl_->active_tree()->set_needs_update_draw_properties();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(0, 0, 100, 100).ToString(),
              render_pass_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              render_pass_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              render_pass_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }

  // Applying a different contents scale to the mask layer means it will have
  // a larger texture, but it should use the same tex coords to cover the
  // layer it masks.
  mask_layer->SetContentBounds(mask_size);
  mask_layer->SetContentsScale(1.f, 1.f);
  host_impl_->active_tree()->set_needs_update_draw_properties();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(1u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(0, 0, 100, 100).ToString(),
              render_pass_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              render_pass_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              render_pass_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
}

TEST_F(LayerTreeHostImplTest, ReflectionMaskLayerWithDifferentBounds) {
  // The replica's mask layer has bounds 100x100 but the replica is of a
  // layer with bounds 50x50.

  scoped_ptr<LayerImpl> scoped_root =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  LayerImpl* root = scoped_root.get();
  root->SetHasRenderSurface(true);

  host_impl_->active_tree()->SetRootLayer(scoped_root.Pass());

  scoped_ptr<LayerImpl> scoped_content_layer =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  LayerImpl* content_layer = scoped_content_layer.get();
  root->AddChild(scoped_content_layer.Pass());

  scoped_ptr<LayerImpl> scoped_replica_layer =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  LayerImpl* replica_layer = scoped_replica_layer.get();
  content_layer->SetReplicaLayer(scoped_replica_layer.Pass());
  content_layer->SetHasRenderSurface(true);

  scoped_ptr<FakeMaskLayerImpl> scoped_mask_layer =
      FakeMaskLayerImpl::Create(host_impl_->active_tree(), 4);
  FakeMaskLayerImpl* mask_layer = scoped_mask_layer.get();
  replica_layer->SetMaskLayer(scoped_mask_layer.Pass());
  replica_layer->SetHasRenderSurface(true);

  gfx::Size root_size(100, 100);
  root->SetBounds(root_size);
  root->SetContentBounds(root_size);
  root->SetPosition(gfx::PointF());

  gfx::Size layer_size(50, 50);
  content_layer->SetBounds(layer_size);
  content_layer->SetContentBounds(layer_size);
  content_layer->SetPosition(gfx::PointF());
  content_layer->SetDrawsContent(true);

  gfx::Size mask_size(100, 100);
  mask_layer->SetBounds(mask_size);
  mask_layer->SetContentBounds(mask_size);
  mask_layer->SetPosition(gfx::PointF());
  mask_layer->SetDrawsContent(true);

  // Check that the mask fills the surface.
  float device_scale_factor = 1.f;
  host_impl_->SetViewportSize(root_size);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(2u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.ElementAt(1)->material);
    const RenderPassDrawQuad* replica_quad = RenderPassDrawQuad::MaterialCast(
        frame.render_passes[0]->quad_list.ElementAt(1));
    EXPECT_EQ(gfx::Rect(0, 0, 50, 50).ToString(),
              replica_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              replica_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              replica_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }

  // Applying a DSF should change the render surface size, but won't affect
  // which part of the mask is used.
  device_scale_factor = 2.f;
  gfx::Size device_viewport =
      gfx::ToFlooredSize(gfx::ScaleSize(root_size, device_scale_factor));
  host_impl_->SetViewportSize(device_viewport);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  host_impl_->active_tree()->set_needs_update_draw_properties();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(2u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.ElementAt(1)->material);
    const RenderPassDrawQuad* replica_quad = RenderPassDrawQuad::MaterialCast(
        frame.render_passes[0]->quad_list.ElementAt(1));
    EXPECT_EQ(gfx::Rect(0, 0, 100, 100).ToString(),
              replica_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              replica_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              replica_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }

  // Applying an equivalent content scale on the content layer and the mask
  // should still result in the same part of the mask being used.
  gfx::Size layer_size_large =
      gfx::ToRoundedSize(gfx::ScaleSize(layer_size, device_scale_factor));
  content_layer->SetContentBounds(layer_size_large);
  content_layer->SetContentsScale(device_scale_factor, device_scale_factor);
  gfx::Size mask_size_large =
      gfx::ToRoundedSize(gfx::ScaleSize(mask_size, device_scale_factor));
  mask_layer->SetContentBounds(mask_size_large);
  mask_layer->SetContentsScale(device_scale_factor, device_scale_factor);
  host_impl_->active_tree()->set_needs_update_draw_properties();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(2u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.ElementAt(1)->material);
    const RenderPassDrawQuad* replica_quad = RenderPassDrawQuad::MaterialCast(
        frame.render_passes[0]->quad_list.ElementAt(1));
    EXPECT_EQ(gfx::Rect(0, 0, 100, 100).ToString(),
              replica_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              replica_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              replica_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }

  // Applying a different contents scale to the mask layer means it will have
  // a larger texture, but it should use the same tex coords to cover the
  // layer it masks.
  mask_layer->SetContentBounds(mask_size);
  mask_layer->SetContentsScale(1.f, 1.f);
  host_impl_->active_tree()->set_needs_update_draw_properties();
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(2u, frame.render_passes[0]->quad_list.size());
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.ElementAt(1)->material);
    const RenderPassDrawQuad* replica_quad = RenderPassDrawQuad::MaterialCast(
        frame.render_passes[0]->quad_list.ElementAt(1));
    EXPECT_EQ(gfx::Rect(0, 0, 100, 100).ToString(),
              replica_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 1.f, 1.f).ToString(),
              replica_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(1.f, 1.f).ToString(),
              replica_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
}

TEST_F(LayerTreeHostImplTest, ReflectionMaskLayerForSurfaceWithUnclippedChild) {
  // The replica is of a layer with bounds 50x50, but it has a child that causes
  // the surface bounds to be larger.

  scoped_ptr<LayerImpl> scoped_root =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  LayerImpl* root = scoped_root.get();
  root->SetHasRenderSurface(true);
  host_impl_->active_tree()->SetRootLayer(scoped_root.Pass());

  scoped_ptr<LayerImpl> scoped_content_layer =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  LayerImpl* content_layer = scoped_content_layer.get();
  root->AddChild(scoped_content_layer.Pass());

  scoped_ptr<LayerImpl> scoped_content_child_layer =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  LayerImpl* content_child_layer = scoped_content_child_layer.get();
  content_layer->AddChild(scoped_content_child_layer.Pass());

  scoped_ptr<LayerImpl> scoped_replica_layer =
      LayerImpl::Create(host_impl_->active_tree(), 4);
  LayerImpl* replica_layer = scoped_replica_layer.get();
  content_layer->SetReplicaLayer(scoped_replica_layer.Pass());
  content_layer->SetHasRenderSurface(true);

  scoped_ptr<FakeMaskLayerImpl> scoped_mask_layer =
      FakeMaskLayerImpl::Create(host_impl_->active_tree(), 5);
  FakeMaskLayerImpl* mask_layer = scoped_mask_layer.get();
  replica_layer->SetMaskLayer(scoped_mask_layer.Pass());
  replica_layer->SetHasRenderSurface(true);

  gfx::Size root_size(100, 100);
  root->SetBounds(root_size);
  root->SetContentBounds(root_size);
  root->SetPosition(gfx::PointF());

  gfx::Size layer_size(50, 50);
  content_layer->SetBounds(layer_size);
  content_layer->SetContentBounds(layer_size);
  content_layer->SetPosition(gfx::PointF());
  content_layer->SetDrawsContent(true);

  gfx::Size child_size(50, 50);
  content_child_layer->SetBounds(child_size);
  content_child_layer->SetContentBounds(child_size);
  content_child_layer->SetPosition(gfx::Point(50, 0));
  content_child_layer->SetDrawsContent(true);

  gfx::Size mask_size(50, 50);
  mask_layer->SetBounds(mask_size);
  mask_layer->SetContentBounds(mask_size);
  mask_layer->SetPosition(gfx::PointF());
  mask_layer->SetDrawsContent(true);

  float device_scale_factor = 1.f;
  host_impl_->SetViewportSize(root_size);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(2u, frame.render_passes[0]->quad_list.size());

    // The surface is 100x50.
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(0, 0, 100, 50).ToString(),
              render_pass_quad->rect.ToString());

    // The mask covers the owning layer only.
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.ElementAt(1)->material);
    const RenderPassDrawQuad* replica_quad = RenderPassDrawQuad::MaterialCast(
        frame.render_passes[0]->quad_list.ElementAt(1));
    EXPECT_EQ(gfx::Rect(0, 0, 100, 50).ToString(),
              replica_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(0.f, 0.f, 2.f, 1.f).ToString(),
              replica_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(2.f, 1.f).ToString(),
              replica_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }

  // Move the child to (-50, 0) instead. Now the mask should be moved to still
  // cover the layer being replicated.
  content_child_layer->SetPosition(gfx::Point(-50, 0));
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(2u, frame.render_passes[0]->quad_list.size());

    // The surface is 100x50 with its origin at (-50, 0).
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(-50, 0, 100, 50).ToString(),
              render_pass_quad->rect.ToString());

    // The mask covers the owning layer only.
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.ElementAt(1)->material);
    const RenderPassDrawQuad* replica_quad = RenderPassDrawQuad::MaterialCast(
        frame.render_passes[0]->quad_list.ElementAt(1));
    EXPECT_EQ(gfx::Rect(-50, 0, 100, 50).ToString(),
              replica_quad->rect.ToString());
    EXPECT_EQ(gfx::RectF(-1.f, 0.f, 2.f, 1.f).ToString(),
              replica_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(2.f, 1.f).ToString(),
              replica_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
}

TEST_F(LayerTreeHostImplTest, MaskLayerForSurfaceWithClippedLayer) {
  // The masked layer has bounds 50x50, but it has a child that causes
  // the surface bounds to be larger. It also has a parent that clips the
  // masked layer and its surface.

  scoped_ptr<LayerImpl> scoped_root =
      LayerImpl::Create(host_impl_->active_tree(), 1);
  LayerImpl* root = scoped_root.get();
  root->SetHasRenderSurface(true);

  host_impl_->active_tree()->SetRootLayer(scoped_root.Pass());

  scoped_ptr<LayerImpl> scoped_clipping_layer =
      LayerImpl::Create(host_impl_->active_tree(), 2);
  LayerImpl* clipping_layer = scoped_clipping_layer.get();
  root->AddChild(scoped_clipping_layer.Pass());

  scoped_ptr<LayerImpl> scoped_content_layer =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  LayerImpl* content_layer = scoped_content_layer.get();
  clipping_layer->AddChild(scoped_content_layer.Pass());

  scoped_ptr<LayerImpl> scoped_content_child_layer =
      LayerImpl::Create(host_impl_->active_tree(), 4);
  LayerImpl* content_child_layer = scoped_content_child_layer.get();
  content_layer->AddChild(scoped_content_child_layer.Pass());

  scoped_ptr<FakeMaskLayerImpl> scoped_mask_layer =
      FakeMaskLayerImpl::Create(host_impl_->active_tree(), 6);
  FakeMaskLayerImpl* mask_layer = scoped_mask_layer.get();
  content_layer->SetMaskLayer(scoped_mask_layer.Pass());
  content_layer->SetHasRenderSurface(true);

  gfx::Size root_size(100, 100);
  root->SetBounds(root_size);
  root->SetContentBounds(root_size);
  root->SetPosition(gfx::PointF());

  gfx::Rect clipping_rect(20, 10, 10, 20);
  clipping_layer->SetBounds(clipping_rect.size());
  clipping_layer->SetContentBounds(clipping_rect.size());
  clipping_layer->SetPosition(clipping_rect.origin());
  clipping_layer->SetMasksToBounds(true);

  gfx::Size layer_size(50, 50);
  content_layer->SetBounds(layer_size);
  content_layer->SetContentBounds(layer_size);
  content_layer->SetPosition(gfx::Point() - clipping_rect.OffsetFromOrigin());
  content_layer->SetDrawsContent(true);

  gfx::Size child_size(50, 50);
  content_child_layer->SetBounds(child_size);
  content_child_layer->SetContentBounds(child_size);
  content_child_layer->SetPosition(gfx::Point(50, 0));
  content_child_layer->SetDrawsContent(true);

  gfx::Size mask_size(100, 100);
  mask_layer->SetBounds(mask_size);
  mask_layer->SetContentBounds(mask_size);
  mask_layer->SetPosition(gfx::PointF());
  mask_layer->SetDrawsContent(true);

  float device_scale_factor = 1.f;
  host_impl_->SetViewportSize(root_size);
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

    ASSERT_EQ(1u, frame.render_passes.size());
    ASSERT_EQ(1u, frame.render_passes[0]->quad_list.size());

    // The surface is clipped to 10x20.
    ASSERT_EQ(DrawQuad::RENDER_PASS,
              frame.render_passes[0]->quad_list.front()->material);
    const RenderPassDrawQuad* render_pass_quad =
        RenderPassDrawQuad::MaterialCast(
            frame.render_passes[0]->quad_list.front());
    EXPECT_EQ(gfx::Rect(20, 10, 10, 20).ToString(),
              render_pass_quad->rect.ToString());
    // The masked layer is 50x50, but the surface size is 10x20. So the texture
    // coords in the mask are scaled by 10/50 and 20/50.
    // The surface is clipped to (20,10) so the mask texture coords are offset
    // by 20/50 and 10/50
    EXPECT_EQ(gfx::ScaleRect(gfx::RectF(20.f, 10.f, 10.f, 20.f), 1.f / 50.f)
                  .ToString(),
              render_pass_quad->MaskUVRect().ToString());
    EXPECT_EQ(gfx::Vector2dF(10.f / 50.f, 20.f / 50.f).ToString(),
              render_pass_quad->mask_uv_scale.ToString());

    host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
    host_impl_->DidDrawAllLayers(frame);
  }
}

class GLRendererWithSetupQuadForAntialiasing : public GLRenderer {
 public:
  using GLRenderer::ShouldAntialiasQuad;
};

TEST_F(LayerTreeHostImplTest, FarAwayQuadsDontNeedAA) {
  // Due to precision issues (especially on Android), sometimes far
  // away quads can end up thinking they need AA.
  float device_scale_factor = 4.f / 3.f;
  host_impl_->SetDeviceScaleFactor(device_scale_factor);
  gfx::Size root_size(2000, 1000);
  gfx::Size device_viewport_size =
      gfx::ToCeiledSize(gfx::ScaleSize(root_size, device_scale_factor));
  host_impl_->SetViewportSize(device_viewport_size);

  host_impl_->CreatePendingTree();
  host_impl_->pending_tree()->PushPageScaleFromMainThread(1.f, 1.f / 16.f,
                                                          16.f);

  scoped_ptr<LayerImpl> scoped_root =
      LayerImpl::Create(host_impl_->pending_tree(), 1);
  LayerImpl* root = scoped_root.get();
  root->SetHasRenderSurface(true);

  host_impl_->pending_tree()->SetRootLayer(scoped_root.Pass());

  scoped_ptr<LayerImpl> scoped_scrolling_layer =
      LayerImpl::Create(host_impl_->pending_tree(), 2);
  LayerImpl* scrolling_layer = scoped_scrolling_layer.get();
  root->AddChild(scoped_scrolling_layer.Pass());

  gfx::Size content_layer_bounds(100000, 100);
  gfx::Size pile_tile_size(3000, 3000);
  scoped_refptr<FakePicturePileImpl> pile(FakePicturePileImpl::CreateFilledPile(
      pile_tile_size, content_layer_bounds));

  scoped_ptr<FakePictureLayerImpl> scoped_content_layer =
      FakePictureLayerImpl::CreateWithRasterSource(host_impl_->pending_tree(),
                                                   3, pile);
  LayerImpl* content_layer = scoped_content_layer.get();
  scrolling_layer->AddChild(scoped_content_layer.Pass());
  content_layer->SetBounds(content_layer_bounds);
  content_layer->SetDrawsContent(true);

  root->SetBounds(root_size);

  gfx::ScrollOffset scroll_offset(100000, 0);
  scrolling_layer->SetScrollClipLayer(root->id());
  scrolling_layer->SetScrollOffset(scroll_offset);

  host_impl_->ActivateSyncTree();

  host_impl_->active_tree()->UpdateDrawProperties();
  ASSERT_EQ(1u, host_impl_->active_tree()->RenderSurfaceLayerList().size());

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));

  ASSERT_EQ(1u, frame.render_passes.size());
  ASSERT_LE(1u, frame.render_passes[0]->quad_list.size());
  const DrawQuad* quad = frame.render_passes[0]->quad_list.front();

  bool antialiased =
      GLRendererWithSetupQuadForAntialiasing::ShouldAntialiasQuad(
          quad->quadTransform(), quad, false);
  EXPECT_FALSE(antialiased);

  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
}


class CompositorFrameMetadataTest : public LayerTreeHostImplTest {
 public:
  CompositorFrameMetadataTest()
      : swap_buffers_complete_(0) {}

  void DidSwapBuffersCompleteOnImplThread() override {
    swap_buffers_complete_++;
  }

  int swap_buffers_complete_;
};

TEST_F(CompositorFrameMetadataTest, CompositorFrameAckCountsAsSwapComplete) {
  SetupRootLayerImpl(FakeLayerWithQuads::Create(host_impl_->active_tree(), 1));
  {
    LayerTreeHostImpl::FrameData frame;
    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
    host_impl_->DrawLayers(&frame, base::TimeTicks());
    host_impl_->DidDrawAllLayers(frame);
  }
  CompositorFrameAck ack;
  host_impl_->ReclaimResources(&ack);
  host_impl_->DidSwapBuffersComplete();
  EXPECT_EQ(swap_buffers_complete_, 1);
}

class CountingSoftwareDevice : public SoftwareOutputDevice {
 public:
  CountingSoftwareDevice() : frames_began_(0), frames_ended_(0) {}

  SkCanvas* BeginPaint(const gfx::Rect& damage_rect) override {
    ++frames_began_;
    return SoftwareOutputDevice::BeginPaint(damage_rect);
  }
  void EndPaint(SoftwareFrameData* frame_data) override {
    ++frames_ended_;
    SoftwareOutputDevice::EndPaint(frame_data);
  }

  int frames_began_, frames_ended_;
};

TEST_F(LayerTreeHostImplTest, ForcedDrawToSoftwareDeviceBasicRender) {
  // No main thread evictions in resourceless software mode.
  set_reduce_memory_result(false);
  CountingSoftwareDevice* software_device = new CountingSoftwareDevice();
  bool delegated_rendering = false;
  FakeOutputSurface* output_surface =
      FakeOutputSurface::CreateDeferredGL(
          scoped_ptr<SoftwareOutputDevice>(software_device),
          delegated_rendering).release();
  EXPECT_TRUE(CreateHostImpl(DefaultSettings(),
                             scoped_ptr<OutputSurface>(output_surface)));
  host_impl_->SetViewportSize(gfx::Size(50, 50));

  SetupScrollAndContentsLayers(gfx::Size(100, 100));

  const gfx::Transform external_transform;
  const gfx::Rect external_viewport;
  const gfx::Rect external_clip;
  const bool resourceless_software_draw = true;
  host_impl_->SetExternalDrawConstraints(external_transform,
                                         external_viewport,
                                         external_clip,
                                         external_viewport,
                                         external_transform,
                                         resourceless_software_draw);

  EXPECT_EQ(0, software_device->frames_began_);
  EXPECT_EQ(0, software_device->frames_ended_);

  DrawFrame();

  EXPECT_EQ(1, software_device->frames_began_);
  EXPECT_EQ(1, software_device->frames_ended_);

  // Call other API methods that are likely to hit NULL pointer in this mode.
  EXPECT_TRUE(host_impl_->AsValue().get());
  EXPECT_TRUE(host_impl_->ActivationStateAsValue().get());
}

TEST_F(LayerTreeHostImplTest,
       ForcedDrawToSoftwareDeviceSkipsUnsupportedLayers) {
  set_reduce_memory_result(false);
  bool delegated_rendering = false;
  FakeOutputSurface* output_surface =
      FakeOutputSurface::CreateDeferredGL(
          scoped_ptr<SoftwareOutputDevice>(new CountingSoftwareDevice()),
          delegated_rendering).release();
  EXPECT_TRUE(CreateHostImpl(DefaultSettings(),
                             scoped_ptr<OutputSurface>(output_surface)));

  const gfx::Transform external_transform;
  const gfx::Rect external_viewport;
  const gfx::Rect external_clip;
  const bool resourceless_software_draw = true;
  host_impl_->SetExternalDrawConstraints(external_transform,
                                         external_viewport,
                                         external_clip,
                                         external_viewport,
                                         external_transform,
                                         resourceless_software_draw);

  // SolidColorLayerImpl will be drawn.
  scoped_ptr<SolidColorLayerImpl> root_layer =
      SolidColorLayerImpl::Create(host_impl_->active_tree(), 1);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);

  EXPECT_EQ(1u, frame.will_draw_layers.size());
  EXPECT_EQ(host_impl_->active_tree()->root_layer(), frame.will_draw_layers[0]);
}

class LayerTreeHostImplTestDeferredInitialize : public LayerTreeHostImplTest {
 protected:
  void SetUp() override {
    LayerTreeHostImplTest::SetUp();

    set_reduce_memory_result(false);

    bool delegated_rendering = false;
    scoped_ptr<FakeOutputSurface> output_surface(
        FakeOutputSurface::CreateDeferredGL(
            scoped_ptr<SoftwareOutputDevice>(new CountingSoftwareDevice()),
            delegated_rendering));
    output_surface_ = output_surface.get();

    EXPECT_TRUE(CreateHostImpl(DefaultSettings(), output_surface.Pass()));

    scoped_ptr<SolidColorLayerImpl> root_layer =
        SolidColorLayerImpl::Create(host_impl_->active_tree(), 1);
    SetupRootLayerImpl(root_layer.Pass());

    onscreen_context_provider_ = TestContextProvider::Create();
  }

  void UpdateRendererCapabilitiesOnImplThread() override {
    did_update_renderer_capabilities_ = true;
  }

  FakeOutputSurface* output_surface_;
  scoped_refptr<TestContextProvider> onscreen_context_provider_;
  bool did_update_renderer_capabilities_;
};


TEST_F(LayerTreeHostImplTestDeferredInitialize, Success) {
  // Software draw.
  DrawFrame();

  EXPECT_FALSE(host_impl_->output_surface()->context_provider());

  // DeferredInitialize and hardware draw.
  did_update_renderer_capabilities_ = false;
  EXPECT_TRUE(
      output_surface_->InitializeAndSetContext3d(onscreen_context_provider_));
  EXPECT_EQ(onscreen_context_provider_.get(),
            host_impl_->output_surface()->context_provider());
  EXPECT_TRUE(did_update_renderer_capabilities_);

  // Defer intialized GL draw.
  DrawFrame();

  // Revert back to software.
  did_update_renderer_capabilities_ = false;
  output_surface_->ReleaseGL();
  EXPECT_FALSE(host_impl_->output_surface()->context_provider());
  EXPECT_TRUE(did_update_renderer_capabilities_);

  // Software draw again.
  DrawFrame();
}

TEST_F(LayerTreeHostImplTestDeferredInitialize, Fails) {
  // Software draw.
  DrawFrame();

  // Fail initialization of the onscreen context before the OutputSurface binds
  // it to the thread.
  onscreen_context_provider_->UnboundTestContext3d()->set_context_lost(true);

  EXPECT_FALSE(host_impl_->output_surface()->context_provider());

  // DeferredInitialize fails.
  did_update_renderer_capabilities_ = false;
  EXPECT_FALSE(
      output_surface_->InitializeAndSetContext3d(onscreen_context_provider_));
  EXPECT_FALSE(host_impl_->output_surface()->context_provider());
  EXPECT_FALSE(did_update_renderer_capabilities_);

  // Software draw again.
  DrawFrame();
}

// Checks that we have a non-0 default allocation if we pass a context that
// doesn't support memory management extensions.
TEST_F(LayerTreeHostImplTest, DefaultMemoryAllocation) {
  LayerTreeSettings settings;
  host_impl_ = LayerTreeHostImpl::Create(settings,
                                         this,
                                         &proxy_,
                                         &stats_instrumentation_,
                                         shared_bitmap_manager_.get(),
                                         gpu_memory_buffer_manager_.get(),
                                         0);

  scoped_ptr<OutputSurface> output_surface(
      FakeOutputSurface::Create3d(TestWebGraphicsContext3D::Create()));
  host_impl_->InitializeRenderer(output_surface.Pass());
  EXPECT_LT(0ul, host_impl_->memory_allocation_limit_bytes());
}

TEST_F(LayerTreeHostImplTest, MemoryPolicy) {
  ManagedMemoryPolicy policy1(
      456, gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING, 1000);
  int everything_cutoff_value = ManagedMemoryPolicy::PriorityCutoffToValue(
      gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING);
  int allow_nice_to_have_cutoff_value =
      ManagedMemoryPolicy::PriorityCutoffToValue(
          gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE);
  int nothing_cutoff_value = ManagedMemoryPolicy::PriorityCutoffToValue(
      gpu::MemoryAllocation::CUTOFF_ALLOW_NOTHING);

  // GPU rasterization should be disabled by default on the tree(s)
  EXPECT_FALSE(host_impl_->active_tree()->use_gpu_rasterization());
  EXPECT_TRUE(host_impl_->pending_tree() == NULL);

  host_impl_->SetVisible(true);
  host_impl_->SetMemoryPolicy(policy1);
  EXPECT_EQ(policy1.bytes_limit_when_visible, current_limit_bytes_);
  EXPECT_EQ(everything_cutoff_value, current_priority_cutoff_value_);

  host_impl_->SetVisible(false);
  EXPECT_EQ(0u, current_limit_bytes_);
  EXPECT_EQ(nothing_cutoff_value, current_priority_cutoff_value_);

  host_impl_->SetVisible(true);
  EXPECT_EQ(policy1.bytes_limit_when_visible, current_limit_bytes_);
  EXPECT_EQ(everything_cutoff_value, current_priority_cutoff_value_);

  // Now enable GPU rasterization and test if we get nice to have cutoff,
  // when visible.
  LayerTreeSettings settings;
  settings.gpu_rasterization_enabled = true;
  host_impl_ = LayerTreeHostImpl::Create(
      settings, this, &proxy_, &stats_instrumentation_, NULL, NULL, 0);
  host_impl_->SetUseGpuRasterization(true);
  host_impl_->SetVisible(true);
  host_impl_->SetMemoryPolicy(policy1);
  EXPECT_EQ(policy1.bytes_limit_when_visible, current_limit_bytes_);
  EXPECT_EQ(allow_nice_to_have_cutoff_value, current_priority_cutoff_value_);

  host_impl_->SetVisible(false);
  EXPECT_EQ(0u, current_limit_bytes_);
  EXPECT_EQ(nothing_cutoff_value, current_priority_cutoff_value_);
}

TEST_F(LayerTreeHostImplTest, RequireHighResWhenVisible) {
  ASSERT_TRUE(host_impl_->active_tree());

  // RequiresHighResToDraw is set when new output surface is used.
  EXPECT_TRUE(host_impl_->RequiresHighResToDraw());

  host_impl_->ResetRequiresHighResToDraw();

  host_impl_->SetVisible(false);
  EXPECT_FALSE(host_impl_->RequiresHighResToDraw());
  host_impl_->SetVisible(true);
  EXPECT_TRUE(host_impl_->RequiresHighResToDraw());
  host_impl_->SetVisible(false);
  EXPECT_TRUE(host_impl_->RequiresHighResToDraw());

  host_impl_->ResetRequiresHighResToDraw();

  EXPECT_FALSE(host_impl_->RequiresHighResToDraw());
  host_impl_->SetVisible(true);
  EXPECT_TRUE(host_impl_->RequiresHighResToDraw());
}

TEST_F(LayerTreeHostImplTest, RequireHighResAfterGpuRasterizationToggles) {
  ASSERT_TRUE(host_impl_->active_tree());
  EXPECT_FALSE(host_impl_->use_gpu_rasterization());

  // RequiresHighResToDraw is set when new output surface is used.
  EXPECT_TRUE(host_impl_->RequiresHighResToDraw());

  host_impl_->ResetRequiresHighResToDraw();

  host_impl_->SetUseGpuRasterization(false);
  EXPECT_FALSE(host_impl_->RequiresHighResToDraw());
  host_impl_->SetUseGpuRasterization(true);
  EXPECT_TRUE(host_impl_->RequiresHighResToDraw());
  host_impl_->SetUseGpuRasterization(false);
  EXPECT_TRUE(host_impl_->RequiresHighResToDraw());

  host_impl_->ResetRequiresHighResToDraw();

  EXPECT_FALSE(host_impl_->RequiresHighResToDraw());
  host_impl_->SetUseGpuRasterization(true);
  EXPECT_TRUE(host_impl_->RequiresHighResToDraw());
}

class LayerTreeHostImplTestPrepareTiles : public LayerTreeHostImplTest {
 public:
  void SetUp() override {
    LayerTreeSettings settings;
    settings.impl_side_painting = true;

    fake_host_impl_ = new FakeLayerTreeHostImpl(
        settings, &proxy_, shared_bitmap_manager_.get());
    host_impl_.reset(fake_host_impl_);
    host_impl_->InitializeRenderer(CreateOutputSurface());
    host_impl_->SetViewportSize(gfx::Size(10, 10));
  }

  FakeLayerTreeHostImpl* fake_host_impl_;
};

TEST_F(LayerTreeHostImplTestPrepareTiles, PrepareTilesWhenInvisible) {
  fake_host_impl_->DidModifyTilePriorities();
  EXPECT_TRUE(fake_host_impl_->prepare_tiles_needed());
  fake_host_impl_->SetVisible(false);
  EXPECT_FALSE(fake_host_impl_->prepare_tiles_needed());
}

TEST_F(LayerTreeHostImplTest, UIResourceManagement) {
  scoped_ptr<TestWebGraphicsContext3D> context =
      TestWebGraphicsContext3D::Create();
  TestWebGraphicsContext3D* context3d = context.get();
  scoped_ptr<FakeOutputSurface> output_surface = FakeOutputSurface::Create3d();
  CreateHostImpl(DefaultSettings(), output_surface.Pass());

  EXPECT_EQ(0u, context3d->NumTextures());

  UIResourceId ui_resource_id = 1;
  bool is_opaque = false;
  UIResourceBitmap bitmap(gfx::Size(1, 1), is_opaque);
  host_impl_->CreateUIResource(ui_resource_id, bitmap);
  EXPECT_EQ(1u, context3d->NumTextures());
  ResourceProvider::ResourceId id1 =
      host_impl_->ResourceIdForUIResource(ui_resource_id);
  EXPECT_NE(0u, id1);

  // Multiple requests with the same id is allowed.  The previous texture is
  // deleted.
  host_impl_->CreateUIResource(ui_resource_id, bitmap);
  EXPECT_EQ(1u, context3d->NumTextures());
  ResourceProvider::ResourceId id2 =
      host_impl_->ResourceIdForUIResource(ui_resource_id);
  EXPECT_NE(0u, id2);
  EXPECT_NE(id1, id2);

  // Deleting invalid UIResourceId is allowed and does not change state.
  host_impl_->DeleteUIResource(-1);
  EXPECT_EQ(1u, context3d->NumTextures());

  // Should return zero for invalid UIResourceId.  Number of textures should
  // not change.
  EXPECT_EQ(0u, host_impl_->ResourceIdForUIResource(-1));
  EXPECT_EQ(1u, context3d->NumTextures());

  host_impl_->DeleteUIResource(ui_resource_id);
  EXPECT_EQ(0u, host_impl_->ResourceIdForUIResource(ui_resource_id));
  EXPECT_EQ(0u, context3d->NumTextures());

  // Should not change state for multiple deletion on one UIResourceId
  host_impl_->DeleteUIResource(ui_resource_id);
  EXPECT_EQ(0u, context3d->NumTextures());
}

TEST_F(LayerTreeHostImplTest, CreateETC1UIResource) {
  scoped_ptr<TestWebGraphicsContext3D> context =
      TestWebGraphicsContext3D::Create();
  TestWebGraphicsContext3D* context3d = context.get();
  CreateHostImpl(DefaultSettings(), FakeOutputSurface::Create3d());

  EXPECT_EQ(0u, context3d->NumTextures());

  gfx::Size size(4, 4);
  // SkImageInfo has no support for ETC1.  The |info| below contains the right
  // total pixel size for the bitmap but not the right height and width.  The
  // correct width/height are passed directly to UIResourceBitmap.
  SkImageInfo info =
      SkImageInfo::Make(4, 2, kAlpha_8_SkColorType, kPremul_SkAlphaType);
  skia::RefPtr<SkPixelRef> pixel_ref =
      skia::AdoptRef(SkMallocPixelRef::NewAllocate(info, 0, 0));
  pixel_ref->setImmutable();
  UIResourceBitmap bitmap(pixel_ref, size);
  UIResourceId ui_resource_id = 1;
  host_impl_->CreateUIResource(ui_resource_id, bitmap);
  EXPECT_EQ(1u, context3d->NumTextures());
  ResourceProvider::ResourceId id1 =
      host_impl_->ResourceIdForUIResource(ui_resource_id);
  EXPECT_NE(0u, id1);
}

void ShutdownReleasesContext_Callback(scoped_ptr<CopyOutputResult> result) {
}

TEST_F(LayerTreeHostImplTest, ShutdownReleasesContext) {
  scoped_refptr<TestContextProvider> context_provider =
      TestContextProvider::Create();

  CreateHostImpl(DefaultSettings(),
                 FakeOutputSurface::Create3d(context_provider));

  SetupRootLayerImpl(LayerImpl::Create(host_impl_->active_tree(), 1));

  ScopedPtrVector<CopyOutputRequest> requests;
  requests.push_back(CopyOutputRequest::CreateRequest(
      base::Bind(&ShutdownReleasesContext_Callback)));

  host_impl_->active_tree()->root_layer()->PassCopyRequests(&requests);

  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);

  // The CopyOutputResult's callback has a ref on the ContextProvider and a
  // texture in a texture mailbox.
  EXPECT_FALSE(context_provider->HasOneRef());
  EXPECT_EQ(1u, context_provider->TestContext3d()->NumTextures());

  host_impl_ = nullptr;

  // The CopyOutputResult's callback was cancelled, the CopyOutputResult
  // released, and the texture deleted.
  EXPECT_TRUE(context_provider->HasOneRef());
  EXPECT_EQ(0u, context_provider->TestContext3d()->NumTextures());
}

TEST_F(LayerTreeHostImplTest, TouchFlingShouldNotBubble) {
  // When flinging via touch, only the child should scroll (we should not
  // bubble).
  gfx::Size surface_size(10, 10);
  gfx::Size content_size(20, 20);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  root_clip->SetHasRenderSurface(true);

  scoped_ptr<LayerImpl> root =
      CreateScrollableLayer(1, content_size, root_clip.get());
  root->SetIsContainerForFixedPositionLayers(true);
  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, content_size, root_clip.get());

  root->AddChild(child.Pass());
  int root_id = root->id();
  root_clip->AddChild(root.Pass());

  host_impl_->SetViewportSize(surface_size);
  host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 3, 1,
                                                      Layer::INVALID_ID);
  host_impl_->active_tree()->DidBecomeActive();
  DrawFrame();
  {
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(),
                                      InputHandler::Gesture));

    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->FlingScrollBegin());

    gfx::Vector2d scroll_delta(0, 100);
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);

    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();

    // Only the child should have scrolled.
    ASSERT_EQ(1u, scroll_info->scrolls.size());
    ExpectNone(*scroll_info.get(), root_id);
  }
}

TEST_F(LayerTreeHostImplTest, TouchFlingShouldLockToFirstScrolledLayer) {
  // Scroll a child layer beyond its maximum scroll range and make sure the
  // the scroll doesn't bubble up to the parent layer.
  gfx::Size surface_size(10, 10);
  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetHasRenderSurface(true);
  scoped_ptr<LayerImpl> root_scrolling =
      CreateScrollableLayer(2, surface_size, root.get());

  scoped_ptr<LayerImpl> grand_child =
      CreateScrollableLayer(4, surface_size, root.get());
  grand_child->SetScrollOffset(gfx::ScrollOffset(0, 2));

  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(3, surface_size, root.get());
  child->SetScrollOffset(gfx::ScrollOffset(0, 4));
  child->AddChild(grand_child.Pass());

  root_scrolling->AddChild(child.Pass());
  root->AddChild(root_scrolling.Pass());
  host_impl_->active_tree()->SetRootLayer(root.Pass());
  host_impl_->active_tree()->DidBecomeActive();
  host_impl_->SetViewportSize(surface_size);
  DrawFrame();
  {
    scoped_ptr<ScrollAndScaleSet> scroll_info;
    LayerImpl* child =
        host_impl_->active_tree()->root_layer()->children()[0]->children()[0];
    LayerImpl* grand_child = child->children()[0];

    gfx::Vector2d scroll_delta(0, -2);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
    EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), scroll_delta).did_scroll);

    // The grand child should have scrolled up to its limit.
    scroll_info = host_impl_->ProcessScrollDeltas();
    ASSERT_EQ(1u, scroll_info->scrolls.size());
    ExpectContains(*scroll_info, grand_child->id(), scroll_delta);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), grand_child);

    // The child should have received the bubbled delta, but the locked
    // scrolling layer should remain set as the grand child.
    EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), scroll_delta).did_scroll);
    scroll_info = host_impl_->ProcessScrollDeltas();
    ASSERT_EQ(2u, scroll_info->scrolls.size());
    ExpectContains(*scroll_info, grand_child->id(), scroll_delta);
    ExpectContains(*scroll_info, child->id(), scroll_delta);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), grand_child);

    // The first |ScrollBy| after the fling should re-lock the scrolling
    // layer to the first layer that scrolled, which is the child.
    EXPECT_EQ(InputHandler::ScrollStarted, host_impl_->FlingScrollBegin());
    EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), scroll_delta).did_scroll);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), child);

    // The child should have scrolled up to its limit.
    scroll_info = host_impl_->ProcessScrollDeltas();
    ASSERT_EQ(2u, scroll_info->scrolls.size());
    ExpectContains(*scroll_info, grand_child->id(), scroll_delta);
    ExpectContains(*scroll_info, child->id(), scroll_delta + scroll_delta);

    // As the locked layer is at it's limit, no further scrolling can occur.
    EXPECT_FALSE(host_impl_->ScrollBy(gfx::Point(), scroll_delta).did_scroll);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), child);
    host_impl_->ScrollEnd();
  }
}

TEST_F(LayerTreeHostImplTest, WheelFlingShouldBubble) {
  // When flinging via wheel, the root should eventually scroll (we should
  // bubble).
  gfx::Size surface_size(10, 10);
  gfx::Size content_size(20, 20);
  scoped_ptr<LayerImpl> root_clip =
      LayerImpl::Create(host_impl_->active_tree(), 3);
  root_clip->SetHasRenderSurface(true);
  scoped_ptr<LayerImpl> root_scroll =
      CreateScrollableLayer(1, content_size, root_clip.get());
  int root_scroll_id = root_scroll->id();
  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(2, content_size, root_clip.get());

  root_scroll->AddChild(child.Pass());
  root_clip->AddChild(root_scroll.Pass());

  host_impl_->SetViewportSize(surface_size);
  host_impl_->active_tree()->SetRootLayer(root_clip.Pass());
  host_impl_->active_tree()->DidBecomeActive();
  DrawFrame();
  {
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));

    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->FlingScrollBegin());

    gfx::Vector2d scroll_delta(0, 100);
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);

    host_impl_->ScrollEnd();

    scoped_ptr<ScrollAndScaleSet> scroll_info =
        host_impl_->ProcessScrollDeltas();

    // The root should have scrolled.
    ASSERT_EQ(2u, scroll_info->scrolls.size());
    ExpectContains(*scroll_info.get(), root_scroll_id, gfx::Vector2d(0, 10));
  }
}

TEST_F(LayerTreeHostImplTest, ScrollUnknownNotOnAncestorChain) {
  // If we ray cast a scroller that is not on the first layer's ancestor chain,
  // we should return ScrollUnknown.
  gfx::Size content_size(100, 100);
  SetupScrollAndContentsLayers(content_size);

  int scroll_layer_id = 2;
  LayerImpl* scroll_layer =
      host_impl_->active_tree()->LayerById(scroll_layer_id);
  scroll_layer->SetDrawsContent(true);

  int page_scale_layer_id = 5;
  LayerImpl* page_scale_layer =
      host_impl_->active_tree()->LayerById(page_scale_layer_id);

  int occluder_layer_id = 6;
  scoped_ptr<LayerImpl> occluder_layer =
      LayerImpl::Create(host_impl_->active_tree(), occluder_layer_id);
  occluder_layer->SetDrawsContent(true);
  occluder_layer->SetBounds(content_size);
  occluder_layer->SetContentBounds(content_size);
  occluder_layer->SetPosition(gfx::PointF());

  // The parent of the occluder is *above* the scroller.
  page_scale_layer->AddChild(occluder_layer.Pass());

  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollUnknown,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
}

TEST_F(LayerTreeHostImplTest, ScrollUnknownScrollAncestorMismatch) {
  // If we ray cast a scroller this is on the first layer's ancestor chain, but
  // is not the first scroller we encounter when walking up from the layer, we
  // should also return ScrollUnknown.
  gfx::Size content_size(100, 100);
  SetupScrollAndContentsLayers(content_size);

  int scroll_layer_id = 2;
  LayerImpl* scroll_layer =
      host_impl_->active_tree()->LayerById(scroll_layer_id);
  scroll_layer->SetDrawsContent(true);

  int occluder_layer_id = 6;
  scoped_ptr<LayerImpl> occluder_layer =
      LayerImpl::Create(host_impl_->active_tree(), occluder_layer_id);
  occluder_layer->SetDrawsContent(true);
  occluder_layer->SetBounds(content_size);
  occluder_layer->SetContentBounds(content_size);
  occluder_layer->SetPosition(gfx::PointF(-10.f, -10.f));

  int child_scroll_clip_layer_id = 7;
  scoped_ptr<LayerImpl> child_scroll_clip =
      LayerImpl::Create(host_impl_->active_tree(), child_scroll_clip_layer_id);

  int child_scroll_layer_id = 8;
  scoped_ptr<LayerImpl> child_scroll = CreateScrollableLayer(
      child_scroll_layer_id, content_size, child_scroll_clip.get());

  child_scroll->SetPosition(gfx::PointF(10.f, 10.f));

  child_scroll->AddChild(occluder_layer.Pass());
  scroll_layer->AddChild(child_scroll.Pass());

  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollUnknown,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
}

TEST_F(LayerTreeHostImplTest, ScrollInvisibleScroller) {
  gfx::Size content_size(100, 100);
  SetupScrollAndContentsLayers(content_size);

  LayerImpl* root = host_impl_->active_tree()->LayerById(1);

  int scroll_layer_id = 2;
  LayerImpl* scroll_layer =
      host_impl_->active_tree()->LayerById(scroll_layer_id);

  int child_scroll_layer_id = 7;
  scoped_ptr<LayerImpl> child_scroll =
      CreateScrollableLayer(child_scroll_layer_id, content_size, root);
  child_scroll->SetDrawsContent(false);

  scroll_layer->AddChild(child_scroll.Pass());

  DrawFrame();

  // We should not have scrolled |child_scroll| even though we technically "hit"
  // it. The reason for this is that if the scrolling the scroll would not move
  // any layer that is a drawn RSLL member, then we can ignore the hit.
  //
  // Why ScrollStarted? In this case, it's because we've bubbled out and started
  // overscrolling the inner viewport.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));

  EXPECT_EQ(2, host_impl_->CurrentlyScrollingLayer()->id());
}

TEST_F(LayerTreeHostImplTest, ScrollInvisibleScrollerWithVisibleScrollChild) {
  // This test case is very similar to the one above with one key difference:
  // the invisible scroller has a scroll child that is indeed draw contents.
  // If we attempt to initiate a gesture scroll off of the visible scroll child
  // we should still start the scroll child.
  gfx::Size content_size(100, 100);
  SetupScrollAndContentsLayers(content_size);

  LayerImpl* root = host_impl_->active_tree()->LayerById(1);

  int scroll_layer_id = 2;
  LayerImpl* scroll_layer =
      host_impl_->active_tree()->LayerById(scroll_layer_id);

  int scroll_child_id = 6;
  scoped_ptr<LayerImpl> scroll_child =
      LayerImpl::Create(host_impl_->active_tree(), scroll_child_id);
  scroll_child->SetDrawsContent(true);
  scroll_child->SetBounds(content_size);
  scroll_child->SetContentBounds(content_size);
  // Move the scroll child so it's not hit by our test point.
  scroll_child->SetPosition(gfx::PointF(10.f, 10.f));

  int invisible_scroll_layer_id = 7;
  scoped_ptr<LayerImpl> invisible_scroll =
      CreateScrollableLayer(invisible_scroll_layer_id, content_size, root);
  invisible_scroll->SetDrawsContent(false);

  int container_id = 8;
  scoped_ptr<LayerImpl> container =
      LayerImpl::Create(host_impl_->active_tree(), container_id);

  scoped_ptr<std::set<LayerImpl*>> scroll_children(new std::set<LayerImpl*>);
  scroll_children->insert(scroll_child.get());
  invisible_scroll->SetScrollChildren(scroll_children.release());

  scroll_child->SetScrollParent(invisible_scroll.get());

  container->AddChild(invisible_scroll.Pass());
  container->AddChild(scroll_child.Pass());

  scroll_layer->AddChild(container.Pass());

  DrawFrame();

  // We should not have scrolled |child_scroll| even though we technically "hit"
  // it. The reason for this is that if the scrolling the scroll would not move
  // any layer that is a drawn RSLL member, then we can ignore the hit.
  //
  // Why ScrollStarted? In this case, it's because we've bubbled out and started
  // overscrolling the inner viewport.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));

  EXPECT_EQ(7, host_impl_->CurrentlyScrollingLayer()->id());
}

// Make sure LatencyInfo carried by LatencyInfoSwapPromise are passed
// to CompositorFrameMetadata after SwapBuffers();
TEST_F(LayerTreeHostImplTest, LatencyInfoPassedToCompositorFrameMetadata) {
  scoped_ptr<SolidColorLayerImpl> root =
      SolidColorLayerImpl::Create(host_impl_->active_tree(), 1);
  root->SetPosition(gfx::PointF());
  root->SetBounds(gfx::Size(10, 10));
  root->SetContentBounds(gfx::Size(10, 10));
  root->SetDrawsContent(true);
  root->SetHasRenderSurface(true);

  host_impl_->active_tree()->SetRootLayer(root.Pass());

  FakeOutputSurface* fake_output_surface =
      static_cast<FakeOutputSurface*>(host_impl_->output_surface());

  const std::vector<ui::LatencyInfo>& metadata_latency_before =
      fake_output_surface->last_sent_frame().metadata.latency_info;
  EXPECT_TRUE(metadata_latency_before.empty());

  ui::LatencyInfo latency_info;
  latency_info.AddLatencyNumber(
      ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 0, 0);
  scoped_ptr<SwapPromise> swap_promise(
      new LatencyInfoSwapPromise(latency_info));
  host_impl_->active_tree()->QueueSwapPromise(swap_promise.Pass());
  host_impl_->SetNeedsRedraw();

  gfx::Rect full_frame_damage(host_impl_->DrawViewportSize());
  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  EXPECT_TRUE(host_impl_->SwapBuffers(frame));

  const std::vector<ui::LatencyInfo>& metadata_latency_after =
      fake_output_surface->last_sent_frame().metadata.latency_info;
  EXPECT_EQ(1u, metadata_latency_after.size());
  EXPECT_TRUE(metadata_latency_after[0].FindLatency(
      ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 0, NULL));
}

TEST_F(LayerTreeHostImplTest, SelectionBoundsPassedToCompositorFrameMetadata) {
  int root_layer_id = 1;
  scoped_ptr<SolidColorLayerImpl> root =
      SolidColorLayerImpl::Create(host_impl_->active_tree(), root_layer_id);
  root->SetPosition(gfx::PointF());
  root->SetBounds(gfx::Size(10, 10));
  root->SetContentBounds(gfx::Size(10, 10));
  root->SetDrawsContent(true);
  root->SetHasRenderSurface(true);

  host_impl_->active_tree()->SetRootLayer(root.Pass());

  // Ensure the default frame selection bounds are empty.
  FakeOutputSurface* fake_output_surface =
      static_cast<FakeOutputSurface*>(host_impl_->output_surface());
  const ViewportSelectionBound& selection_start_before =
      fake_output_surface->last_sent_frame().metadata.selection_start;
  const ViewportSelectionBound& selection_end_before =
      fake_output_surface->last_sent_frame().metadata.selection_end;
  EXPECT_EQ(ViewportSelectionBound(), selection_start_before);
  EXPECT_EQ(ViewportSelectionBound(), selection_end_before);

  // Plumb the layer-local selection bounds.
  gfx::PointF selection_top(5, 0);
  gfx::PointF selection_bottom(5, 5);
  LayerSelectionBound start, end;
  start.type = SELECTION_BOUND_CENTER;
  start.layer_id = root_layer_id;
  start.edge_bottom = selection_bottom;
  start.edge_top = selection_top;
  end = start;
  host_impl_->active_tree()->RegisterSelection(start, end);

  // Trigger a draw-swap sequence.
  host_impl_->SetNeedsRedraw();

  gfx::Rect full_frame_damage(host_impl_->DrawViewportSize());
  LayerTreeHostImpl::FrameData frame;
  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
  host_impl_->DrawLayers(&frame, gfx::FrameTime::Now());
  host_impl_->DidDrawAllLayers(frame);
  EXPECT_TRUE(host_impl_->SwapBuffers(frame));

  // Ensure the selection bounds have propagated to the frame metadata.
  const ViewportSelectionBound& selection_start_after =
      fake_output_surface->last_sent_frame().metadata.selection_start;
  const ViewportSelectionBound& selection_end_after =
      fake_output_surface->last_sent_frame().metadata.selection_end;
  EXPECT_EQ(start.type, selection_start_after.type);
  EXPECT_EQ(end.type, selection_end_after.type);
  EXPECT_EQ(selection_bottom, selection_start_after.edge_bottom);
  EXPECT_EQ(selection_top, selection_start_after.edge_top);
  EXPECT_TRUE(selection_start_after.visible);
  EXPECT_TRUE(selection_start_after.visible);
}

class SimpleSwapPromiseMonitor : public SwapPromiseMonitor {
 public:
  SimpleSwapPromiseMonitor(LayerTreeHost* layer_tree_host,
                           LayerTreeHostImpl* layer_tree_host_impl,
                           int* set_needs_commit_count,
                           int* set_needs_redraw_count,
                           int* forward_to_main_count)
      : SwapPromiseMonitor(layer_tree_host, layer_tree_host_impl),
        set_needs_commit_count_(set_needs_commit_count),
        set_needs_redraw_count_(set_needs_redraw_count),
        forward_to_main_count_(forward_to_main_count) {}

  ~SimpleSwapPromiseMonitor() override {}

  void OnSetNeedsCommitOnMain() override { (*set_needs_commit_count_)++; }

  void OnSetNeedsRedrawOnImpl() override { (*set_needs_redraw_count_)++; }

  void OnForwardScrollUpdateToMainThreadOnImpl() override {
    (*forward_to_main_count_)++;
  }

 private:
  int* set_needs_commit_count_;
  int* set_needs_redraw_count_;
  int* forward_to_main_count_;
};

TEST_F(LayerTreeHostImplTest, SimpleSwapPromiseMonitor) {
  int set_needs_commit_count = 0;
  int set_needs_redraw_count = 0;
  int forward_to_main_count = 0;

  {
    scoped_ptr<SimpleSwapPromiseMonitor> swap_promise_monitor(
        new SimpleSwapPromiseMonitor(NULL,
                                     host_impl_.get(),
                                     &set_needs_commit_count,
                                     &set_needs_redraw_count,
                                     &forward_to_main_count));
    host_impl_->SetNeedsRedraw();
    EXPECT_EQ(0, set_needs_commit_count);
    EXPECT_EQ(1, set_needs_redraw_count);
    EXPECT_EQ(0, forward_to_main_count);
  }

  // Now the monitor is destroyed, SetNeedsRedraw() is no longer being
  // monitored.
  host_impl_->SetNeedsRedraw();
  EXPECT_EQ(0, set_needs_commit_count);
  EXPECT_EQ(1, set_needs_redraw_count);
  EXPECT_EQ(0, forward_to_main_count);

  {
    scoped_ptr<SimpleSwapPromiseMonitor> swap_promise_monitor(
        new SimpleSwapPromiseMonitor(NULL,
                                     host_impl_.get(),
                                     &set_needs_commit_count,
                                     &set_needs_redraw_count,
                                     &forward_to_main_count));
    host_impl_->SetNeedsRedrawRect(gfx::Rect(10, 10));
    EXPECT_EQ(0, set_needs_commit_count);
    EXPECT_EQ(2, set_needs_redraw_count);
    EXPECT_EQ(0, forward_to_main_count);
  }

  {
    scoped_ptr<SimpleSwapPromiseMonitor> swap_promise_monitor(
        new SimpleSwapPromiseMonitor(NULL,
                                     host_impl_.get(),
                                     &set_needs_commit_count,
                                     &set_needs_redraw_count,
                                     &forward_to_main_count));
    // Empty damage rect won't signal the monitor.
    host_impl_->SetNeedsRedrawRect(gfx::Rect());
    EXPECT_EQ(0, set_needs_commit_count);
    EXPECT_EQ(2, set_needs_redraw_count);
    EXPECT_EQ(0, forward_to_main_count);
  }

  {
    set_needs_commit_count = 0;
    set_needs_redraw_count = 0;
    forward_to_main_count = 0;
    scoped_ptr<SimpleSwapPromiseMonitor> swap_promise_monitor(
        new SimpleSwapPromiseMonitor(NULL,
                                     host_impl_.get(),
                                     &set_needs_commit_count,
                                     &set_needs_redraw_count,
                                     &forward_to_main_count));
    LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));

    // Scrolling normally should not trigger any forwarding.
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
    EXPECT_TRUE(
        host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10)).did_scroll);
    host_impl_->ScrollEnd();

    EXPECT_EQ(0, set_needs_commit_count);
    EXPECT_EQ(1, set_needs_redraw_count);
    EXPECT_EQ(0, forward_to_main_count);

    // Scrolling with a scroll handler should defer the swap to the main
    // thread.
    scroll_layer->SetHaveScrollEventHandlers(true);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
    EXPECT_TRUE(
        host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, 10)).did_scroll);
    host_impl_->ScrollEnd();

    EXPECT_EQ(0, set_needs_commit_count);
    EXPECT_EQ(2, set_needs_redraw_count);
    EXPECT_EQ(1, forward_to_main_count);
  }
}

class LayerTreeHostImplWithTopControlsTest : public LayerTreeHostImplTest {
 public:
  void SetUp() override {
    LayerTreeSettings settings = DefaultSettings();
    settings.calculate_top_controls_position = true;
    CreateHostImpl(settings, CreateOutputSurface());
    host_impl_->active_tree()->set_top_controls_height(top_controls_height_);
    host_impl_->active_tree()->set_top_controls_delta(top_controls_height_);
    host_impl_->top_controls_manager()->SetTopControlsHeight(
        top_controls_height_);
  }

 protected:
  static const int top_controls_height_;
};

const int LayerTreeHostImplWithTopControlsTest::top_controls_height_ = 50;

TEST_F(LayerTreeHostImplWithTopControlsTest, NoIdleAnimations) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100))
      ->SetScrollOffset(gfx::ScrollOffset(0, 10));
  host_impl_->Animate(base::TimeTicks());
  EXPECT_FALSE(did_request_redraw_);
}

TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsHeightIsCommitted) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  EXPECT_FALSE(did_request_redraw_);
  host_impl_->CreatePendingTree();
  host_impl_->sync_tree()->set_top_controls_height(100);
  host_impl_->ActivateSyncTree();
  EXPECT_EQ(100, host_impl_->top_controls_manager()->top_controls_height());
}

TEST_F(LayerTreeHostImplWithTopControlsTest,
       TopControlsStayFullyVisibleOnHeightChange) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100));
  EXPECT_EQ(0.f, host_impl_->ControlsTopOffset());

  host_impl_->CreatePendingTree();
  host_impl_->sync_tree()->set_top_controls_height(0);
  host_impl_->ActivateSyncTree();
  EXPECT_EQ(0.f, host_impl_->ControlsTopOffset());

  host_impl_->CreatePendingTree();
  host_impl_->sync_tree()->set_top_controls_height(50);
  host_impl_->ActivateSyncTree();
  EXPECT_EQ(0.f, host_impl_->ControlsTopOffset());
}

TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsAnimationScheduling) {
  SetupScrollAndContentsLayers(gfx::Size(100, 100))
      ->SetScrollOffset(gfx::ScrollOffset(0, 10));
  host_impl_->DidChangeTopControlsPosition();
  EXPECT_TRUE(did_request_animate_);
  EXPECT_TRUE(did_request_redraw_);
}

TEST_F(LayerTreeHostImplWithTopControlsTest, ScrollHandledByTopControls) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
  host_impl_->SetViewportSize(gfx::Size(100, 100));
  host_impl_->top_controls_manager()->UpdateTopControlsState(
      BOTH, SHOWN, false);
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF().ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  // Scroll just the top controls and verify that the scroll succeeds.
  const float residue = 10;
  float offset = top_controls_height_ - residue;
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(-offset, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF().ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  // Scroll across the boundary
  const float content_scroll = 20;
  offset = residue + content_scroll;
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(-top_controls_height_,
            host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF(0, content_scroll).ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  // Now scroll back to the top of the content
  offset = -content_scroll;
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(-top_controls_height_,
            host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF().ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  // And scroll the top controls completely into view
  offset = -top_controls_height_;
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF().ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  // And attempt to scroll past the end
  EXPECT_FALSE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF().ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  host_impl_->ScrollEnd();
}

TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsAnimationAtOrigin) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
  host_impl_->SetViewportSize(gfx::Size(100, 200));
  host_impl_->top_controls_manager()->UpdateTopControlsState(
      BOTH, SHOWN, false);
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF().ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  // Scroll the top controls partially.
  const float residue = 35;
  float offset = top_controls_height_ - residue;
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(-offset, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF().ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  did_request_redraw_ = false;
  did_request_animate_ = false;
  did_request_commit_ = false;

  // End the scroll while the controls are still offset from their limit.
  host_impl_->ScrollEnd();
  ASSERT_TRUE(host_impl_->top_controls_manager()->animation());
  EXPECT_TRUE(did_request_animate_);
  EXPECT_TRUE(did_request_redraw_);
  EXPECT_FALSE(did_request_commit_);

  // The top controls should properly animate until finished, despite the scroll
  // offset being at the origin.
  base::TimeTicks animation_time = gfx::FrameTime::Now();
  while (did_request_animate_) {
    did_request_redraw_ = false;
    did_request_animate_ = false;
    did_request_commit_ = false;

    float old_offset =
        host_impl_->top_controls_manager()->ControlsTopOffset();

    animation_time += base::TimeDelta::FromMilliseconds(5);
    host_impl_->Animate(animation_time);
    EXPECT_EQ(gfx::Vector2dF().ToString(),
              scroll_layer->TotalScrollOffset().ToString());

    float new_offset =
        host_impl_->top_controls_manager()->ControlsTopOffset();

    // No commit is needed as the controls are animating the content offset,
    // not the scroll offset.
    EXPECT_FALSE(did_request_commit_);

    if (new_offset != old_offset)
      EXPECT_TRUE(did_request_redraw_);

    if (new_offset != 0) {
      EXPECT_TRUE(host_impl_->top_controls_manager()->animation());
      EXPECT_TRUE(did_request_animate_);
    }
  }
  EXPECT_FALSE(host_impl_->top_controls_manager()->animation());
}

TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsAnimationAfterScroll) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
  host_impl_->SetViewportSize(gfx::Size(100, 100));
  host_impl_->top_controls_manager()->UpdateTopControlsState(
      BOTH, SHOWN, false);
  float initial_scroll_offset = 50;
  scroll_layer->SetScrollOffset(gfx::ScrollOffset(0, initial_scroll_offset));
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF(0, initial_scroll_offset).ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  // Scroll the top controls partially.
  const float residue = 15;
  float offset = top_controls_height_ - residue;
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(-offset, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF(0, initial_scroll_offset).ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  did_request_redraw_ = false;
  did_request_animate_ = false;
  did_request_commit_ = false;

  // End the scroll while the controls are still offset from the limit.
  host_impl_->ScrollEnd();
  ASSERT_TRUE(host_impl_->top_controls_manager()->animation());
  EXPECT_TRUE(did_request_animate_);
  EXPECT_TRUE(did_request_redraw_);
  EXPECT_FALSE(did_request_commit_);

  // Animate the top controls to the limit.
  base::TimeTicks animation_time = gfx::FrameTime::Now();
  while (did_request_animate_) {
    did_request_redraw_ = false;
    did_request_animate_ = false;
    did_request_commit_ = false;

    float old_offset =
        host_impl_->top_controls_manager()->ControlsTopOffset();

    animation_time += base::TimeDelta::FromMilliseconds(5);
    host_impl_->Animate(animation_time);

    float new_offset =
        host_impl_->top_controls_manager()->ControlsTopOffset();

    if (new_offset != old_offset) {
      EXPECT_TRUE(did_request_redraw_);
      EXPECT_TRUE(did_request_commit_);
    }
  }
  EXPECT_FALSE(host_impl_->top_controls_manager()->animation());
}

TEST_F(LayerTreeHostImplWithTopControlsTest,
       TopControlsScrollDeltaInOverScroll) {
  // test varifies that the overscroll delta should not have accumulated in
  // the top controls if we do a hide and show without releasing finger.

  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
  host_impl_->SetViewportSize(gfx::Size(100, 100));
  host_impl_->top_controls_manager()->UpdateTopControlsState(BOTH, SHOWN,
                                                             false);
  DrawFrame();

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());

  float offset = 50;
  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(-offset, host_impl_->top_controls_manager()->ControlsTopOffset());
  EXPECT_EQ(gfx::Vector2dF().ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);
  EXPECT_EQ(gfx::Vector2dF(0, offset).ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, offset)).did_scroll);

  // Should have fully scrolled
  EXPECT_EQ(gfx::Vector2dF(0, scroll_layer->MaxScrollOffset().y()).ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  float overscrollamount = 10;

  // Overscroll the content
  EXPECT_FALSE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, overscrollamount))
          .did_scroll);
  EXPECT_EQ(gfx::Vector2dF(0, 2 * offset).ToString(),
            scroll_layer->TotalScrollOffset().ToString());
  EXPECT_EQ(gfx::Vector2dF(0, overscrollamount).ToString(),
            host_impl_->accumulated_root_overscroll().ToString());

  EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -2 * offset))
                  .did_scroll);
  EXPECT_EQ(gfx::Vector2dF(0, 0).ToString(),
            scroll_layer->TotalScrollOffset().ToString());
  EXPECT_EQ(-offset, host_impl_->top_controls_manager()->ControlsTopOffset());

  EXPECT_TRUE(
      host_impl_->ScrollBy(gfx::Point(), gfx::Vector2d(0, -offset)).did_scroll);
  EXPECT_EQ(gfx::Vector2dF(0, 0).ToString(),
            scroll_layer->TotalScrollOffset().ToString());

  // Top controls should be fully visible
  EXPECT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());

  host_impl_->ScrollEnd();
}

class LayerTreeHostImplVirtualViewportTest : public LayerTreeHostImplTest {
 public:
  void SetupVirtualViewportLayers(const gfx::Size& content_size,
                                  const gfx::Size& outer_viewport,
                                  const gfx::Size& inner_viewport) {
    LayerTreeImpl* layer_tree_impl = host_impl_->active_tree();
    const int kOuterViewportClipLayerId = 6;
    const int kOuterViewportScrollLayerId = 7;
    const int kInnerViewportScrollLayerId = 2;
    const int kInnerViewportClipLayerId = 4;
    const int kPageScaleLayerId = 5;

    scoped_ptr<LayerImpl> inner_scroll =
        LayerImpl::Create(layer_tree_impl, kInnerViewportScrollLayerId);
    inner_scroll->SetIsContainerForFixedPositionLayers(true);
    inner_scroll->SetScrollOffset(gfx::ScrollOffset());

    scoped_ptr<LayerImpl> inner_clip =
        LayerImpl::Create(layer_tree_impl, kInnerViewportClipLayerId);
    inner_clip->SetBounds(inner_viewport);

    scoped_ptr<LayerImpl> page_scale =
        LayerImpl::Create(layer_tree_impl, kPageScaleLayerId);

    inner_scroll->SetScrollClipLayer(inner_clip->id());
    inner_scroll->SetBounds(outer_viewport);
    inner_scroll->SetContentBounds(outer_viewport);
    inner_scroll->SetPosition(gfx::PointF());

    scoped_ptr<LayerImpl> outer_clip =
        LayerImpl::Create(layer_tree_impl, kOuterViewportClipLayerId);
    outer_clip->SetBounds(outer_viewport);
    outer_clip->SetIsContainerForFixedPositionLayers(true);

    scoped_ptr<LayerImpl> outer_scroll =
        LayerImpl::Create(layer_tree_impl, kOuterViewportScrollLayerId);
    outer_scroll->SetScrollClipLayer(outer_clip->id());
    outer_scroll->SetScrollOffset(gfx::ScrollOffset());
    outer_scroll->SetBounds(content_size);
    outer_scroll->SetContentBounds(content_size);
    outer_scroll->SetPosition(gfx::PointF());

    scoped_ptr<LayerImpl> contents =
        LayerImpl::Create(layer_tree_impl, 8);
    contents->SetDrawsContent(true);
    contents->SetBounds(content_size);
    contents->SetContentBounds(content_size);
    contents->SetPosition(gfx::PointF());

    outer_scroll->AddChild(contents.Pass());
    outer_clip->AddChild(outer_scroll.Pass());
    inner_scroll->AddChild(outer_clip.Pass());
    page_scale->AddChild(inner_scroll.Pass());
    inner_clip->AddChild(page_scale.Pass());

    inner_clip->SetHasRenderSurface(true);
    layer_tree_impl->SetRootLayer(inner_clip.Pass());
    layer_tree_impl->SetViewportLayersFromIds(
        Layer::INVALID_ID, kPageScaleLayerId, kInnerViewportScrollLayerId,
        kOuterViewportScrollLayerId);

    host_impl_->active_tree()->DidBecomeActive();
  }
};

TEST_F(LayerTreeHostImplVirtualViewportTest, FlingScrollBubblesToInner) {
  gfx::Size content_size = gfx::Size(100, 160);
  gfx::Size outer_viewport = gfx::Size(50, 80);
  gfx::Size inner_viewport = gfx::Size(25, 40);

  SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);

  LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
  LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
  DrawFrame();
  {
    gfx::Vector2dF inner_expected;
    gfx::Vector2dF outer_expected;
    EXPECT_VECTOR_EQ(inner_expected, inner_scroll->TotalScrollOffset());
    EXPECT_VECTOR_EQ(outer_expected, outer_scroll->TotalScrollOffset());

    // Make sure the fling goes to the outer viewport first
    EXPECT_EQ(InputHandler::ScrollStarted,
        host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
    EXPECT_EQ(InputHandler::ScrollStarted, host_impl_->FlingScrollBegin());

    gfx::Vector2d scroll_delta(inner_viewport.width(), inner_viewport.height());
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    outer_expected += gfx::Vector2dF(scroll_delta.x(), scroll_delta.y());

    host_impl_->ScrollEnd();

    EXPECT_VECTOR_EQ(inner_expected, inner_scroll->TotalScrollOffset());
    EXPECT_VECTOR_EQ(outer_expected, outer_scroll->TotalScrollOffset());

    // Fling past the outer viewport boundry, make sure inner viewport scrolls.
    EXPECT_EQ(InputHandler::ScrollStarted,
        host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
    EXPECT_EQ(InputHandler::ScrollStarted, host_impl_->FlingScrollBegin());

    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    outer_expected += gfx::Vector2dF(scroll_delta.x(), scroll_delta.y());

    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    inner_expected += gfx::Vector2dF(scroll_delta.x(), scroll_delta.y());

    host_impl_->ScrollEnd();

    EXPECT_VECTOR_EQ(inner_expected, inner_scroll->TotalScrollOffset());
    EXPECT_VECTOR_EQ(outer_expected, outer_scroll->TotalScrollOffset());
  }
}

TEST_F(LayerTreeHostImplVirtualViewportTest,
       DiagonalScrollBubblesPerfectlyToInner) {
  gfx::Size content_size = gfx::Size(100, 160);
  gfx::Size outer_viewport = gfx::Size(50, 80);
  gfx::Size inner_viewport = gfx::Size(25, 40);

  SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);

  LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
  LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
  DrawFrame();
  {
    gfx::Vector2dF inner_expected;
    gfx::Vector2dF outer_expected;
    EXPECT_VECTOR_EQ(inner_expected, inner_scroll->TotalScrollOffset());
    EXPECT_VECTOR_EQ(outer_expected, outer_scroll->TotalScrollOffset());

    // Make sure the scroll goes to the outer viewport first.
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
    EXPECT_EQ(InputHandler::ScrollStarted, host_impl_->FlingScrollBegin());

    // Scroll near the edge of the outer viewport.
    gfx::Vector2d scroll_delta(inner_viewport.width(), inner_viewport.height());
    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    outer_expected += scroll_delta;

    EXPECT_VECTOR_EQ(inner_expected, inner_scroll->TotalScrollOffset());
    EXPECT_VECTOR_EQ(outer_expected, outer_scroll->TotalScrollOffset());

    // Now diagonal scroll across the outer viewport boundary in a single event.
    // The entirety of the scroll should be consumed, as bubbling between inner
    // and outer viewport layers is perfect.
    host_impl_->ScrollBy(gfx::Point(), gfx::ScaleVector2d(scroll_delta, 2));
    outer_expected += scroll_delta;
    inner_expected += scroll_delta;
    host_impl_->ScrollEnd();

    EXPECT_VECTOR_EQ(inner_expected, inner_scroll->TotalScrollOffset());
    EXPECT_VECTOR_EQ(outer_expected, outer_scroll->TotalScrollOffset());
  }
}

TEST_F(LayerTreeHostImplVirtualViewportTest,
       TouchFlingCanLockToViewportLayerAfterBubbling) {
  gfx::Size content_size = gfx::Size(100, 160);
  gfx::Size outer_viewport = gfx::Size(50, 80);
  gfx::Size inner_viewport = gfx::Size(25, 40);

  SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);

  LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
  LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();

  scoped_ptr<LayerImpl> child =
      CreateScrollableLayer(10, outer_viewport, outer_scroll);
  LayerImpl* child_scroll = child.get();
  outer_scroll->children()[0]->AddChild(child.Pass());

  DrawFrame();
  {
    scoped_ptr<ScrollAndScaleSet> scroll_info;

    gfx::Vector2d scroll_delta(0, inner_viewport.height());
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture));
    EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), scroll_delta).did_scroll);

    // The child should have scrolled up to its limit.
    scroll_info = host_impl_->ProcessScrollDeltas();
    ASSERT_EQ(1u, scroll_info->scrolls.size());
    ExpectContains(*scroll_info, child_scroll->id(), scroll_delta);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), child_scroll);

    // The first |ScrollBy| after the fling should re-lock the scrolling
    // layer to the first layer that scrolled, the inner viewport scroll layer.
    EXPECT_EQ(InputHandler::ScrollStarted, host_impl_->FlingScrollBegin());
    EXPECT_TRUE(host_impl_->ScrollBy(gfx::Point(), scroll_delta).did_scroll);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), inner_scroll);

    // The inner viewport should have scrolled up to its limit.
    scroll_info = host_impl_->ProcessScrollDeltas();
    ASSERT_EQ(2u, scroll_info->scrolls.size());
    ExpectContains(*scroll_info, child_scroll->id(), scroll_delta);
    ExpectContains(*scroll_info, inner_scroll->id(), scroll_delta);

    // As the locked layer is at its limit, no further scrolling can occur.
    EXPECT_FALSE(host_impl_->ScrollBy(gfx::Point(), scroll_delta).did_scroll);
    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), inner_scroll);
    host_impl_->ScrollEnd();
  }
}

class LayerTreeHostImplWithImplicitLimitsTest : public LayerTreeHostImplTest {
 public:
  void SetUp() override {
    LayerTreeSettings settings = DefaultSettings();
    settings.max_memory_for_prepaint_percentage = 50;
    CreateHostImpl(settings, CreateOutputSurface());
  }
};

TEST_F(LayerTreeHostImplWithImplicitLimitsTest, ImplicitMemoryLimits) {
  // Set up a memory policy and percentages which could cause
  // 32-bit integer overflows.
  ManagedMemoryPolicy mem_policy(300 * 1024 * 1024);  // 300MB

  // Verify implicit limits are calculated correctly with no overflows
  host_impl_->SetMemoryPolicy(mem_policy);
  EXPECT_EQ(host_impl_->global_tile_state().hard_memory_limit_in_bytes,
            300u * 1024u * 1024u);
  EXPECT_EQ(host_impl_->global_tile_state().soft_memory_limit_in_bytes,
            150u * 1024u * 1024u);
}

TEST_F(LayerTreeHostImplTest, ExternalTransformReflectedInNextDraw) {
  const gfx::Size layer_size(100, 100);
  gfx::Transform external_transform;
  const gfx::Rect external_viewport(layer_size);
  const gfx::Rect external_clip(layer_size);
  const bool resourceless_software_draw = false;
  LayerImpl* layer = SetupScrollAndContentsLayers(layer_size);

  host_impl_->SetExternalDrawConstraints(external_transform,
                                         external_viewport,
                                         external_clip,
                                         external_viewport,
                                         external_transform,
                                         resourceless_software_draw);
  DrawFrame();
  EXPECT_TRANSFORMATION_MATRIX_EQ(
      external_transform, layer->draw_properties().target_space_transform);

  external_transform.Translate(20, 20);
  host_impl_->SetExternalDrawConstraints(external_transform,
                                         external_viewport,
                                         external_clip,
                                         external_viewport,
                                         external_transform,
                                         resourceless_software_draw);
  DrawFrame();
  EXPECT_TRANSFORMATION_MATRIX_EQ(
      external_transform, layer->draw_properties().target_space_transform);
}

TEST_F(LayerTreeHostImplTest, ScrollAnimated) {
  SetupScrollAndContentsLayers(gfx::Size(100, 200));
  DrawFrame();

  base::TimeTicks start_time =
      base::TimeTicks() + base::TimeDelta::FromMilliseconds(100);

  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollAnimated(gfx::Point(), gfx::Vector2d(0, 50)));

  LayerImpl* scrolling_layer = host_impl_->CurrentlyScrollingLayer();

  host_impl_->Animate(start_time);
  host_impl_->UpdateAnimationState(true);

  EXPECT_EQ(gfx::ScrollOffset(), scrolling_layer->TotalScrollOffset());

  host_impl_->Animate(start_time + base::TimeDelta::FromMilliseconds(50));
  host_impl_->UpdateAnimationState(true);

  float y = scrolling_layer->TotalScrollOffset().y();
  EXPECT_TRUE(y > 1 && y < 49);

  // Update target.
  EXPECT_EQ(InputHandler::ScrollStarted,
            host_impl_->ScrollAnimated(gfx::Point(), gfx::Vector2d(0, 50)));

  host_impl_->Animate(start_time + base::TimeDelta::FromMilliseconds(200));
  host_impl_->UpdateAnimationState(true);

  y = scrolling_layer->TotalScrollOffset().y();
  EXPECT_TRUE(y > 50 && y < 100);
  EXPECT_EQ(scrolling_layer, host_impl_->CurrentlyScrollingLayer());

  host_impl_->Animate(start_time + base::TimeDelta::FromMilliseconds(250));
  host_impl_->UpdateAnimationState(true);

  EXPECT_VECTOR_EQ(gfx::ScrollOffset(0, 100),
                   scrolling_layer->TotalScrollOffset());
  EXPECT_EQ(NULL, host_impl_->CurrentlyScrollingLayer());
}

TEST_F(LayerTreeHostImplTest, GetPictureLayerImplPairs) {
  host_impl_->CreatePendingTree();

  scoped_ptr<PictureLayerImpl> layer =
      PictureLayerImpl::Create(host_impl_->pending_tree(), 10, false);
  layer->SetBounds(gfx::Size(10, 10));

  scoped_refptr<RasterSource> pile(FakePicturePileImpl::CreateEmptyPile(
      gfx::Size(10, 10), gfx::Size(10, 10)));
  Region empty_invalidation;
  const PictureLayerTilingSet* null_tiling_set = nullptr;
  layer->UpdateRasterSource(pile, &empty_invalidation, null_tiling_set);

  host_impl_->pending_tree()->SetRootLayer(layer.Pass());

  LayerTreeImpl* pending_tree = host_impl_->pending_tree();
  LayerImpl* pending_layer = pending_tree->root_layer();

  std::vector<PictureLayerImpl::Pair> layer_pairs;
  host_impl_->GetPictureLayerImplPairs(&layer_pairs, true);
  EXPECT_EQ(1u, layer_pairs.size());
  EXPECT_EQ(pending_layer, layer_pairs[0].pending);
  EXPECT_EQ(nullptr, layer_pairs[0].active);

  host_impl_->ActivateSyncTree();

  LayerTreeImpl* active_tree = host_impl_->active_tree();
  LayerImpl* active_layer = active_tree->root_layer();
  EXPECT_NE(active_tree, pending_tree);
  EXPECT_NE(active_layer, pending_layer);
  EXPECT_NE(nullptr, active_tree);
  EXPECT_NE(nullptr, active_layer);

  host_impl_->CreatePendingTree();

  layer_pairs.clear();
  host_impl_->GetPictureLayerImplPairs(&layer_pairs, true);
  EXPECT_EQ(1u, layer_pairs.size());
  EXPECT_EQ(active_layer, layer_pairs[0].active);
  EXPECT_EQ(pending_layer, layer_pairs[0].pending);

  // Activate, the active layer has no twin now.
  host_impl_->ActivateSyncTree();

  layer_pairs.clear();
  host_impl_->GetPictureLayerImplPairs(&layer_pairs, true);
  EXPECT_EQ(1u, layer_pairs.size());
  EXPECT_EQ(active_layer, layer_pairs[0].active);
  EXPECT_EQ(nullptr, layer_pairs[0].pending);

  // Create another layer in the pending tree that's not in the active tree. We
  // should get two pairs.
  host_impl_->CreatePendingTree();
  host_impl_->pending_tree()->root_layer()->AddChild(
      PictureLayerImpl::Create(host_impl_->pending_tree(), 11, false));

  LayerImpl* new_pending_layer = pending_tree->root_layer()->children()[0];

  layer_pairs.clear();
  host_impl_->GetPictureLayerImplPairs(&layer_pairs, true);
  EXPECT_EQ(2u, layer_pairs.size());

  // The pair ordering is flaky, so make it consistent.
  if (layer_pairs[0].active != active_layer)
    std::swap(layer_pairs[0], layer_pairs[1]);

  EXPECT_EQ(active_layer, layer_pairs[0].active);
  EXPECT_EQ(pending_layer, layer_pairs[0].pending);
  EXPECT_EQ(new_pending_layer, layer_pairs[1].pending);
  EXPECT_EQ(nullptr, layer_pairs[1].active);
}

TEST_F(LayerTreeHostImplTest, DidBecomeActive) {
  host_impl_->CreatePendingTree();
  host_impl_->ActivateSyncTree();
  host_impl_->CreatePendingTree();

  LayerTreeImpl* pending_tree = host_impl_->pending_tree();

  scoped_ptr<FakePictureLayerImpl> pending_layer =
      FakePictureLayerImpl::Create(pending_tree, 10);
  FakePictureLayerImpl* raw_pending_layer = pending_layer.get();
  pending_tree->SetRootLayer(pending_layer.Pass());
  ASSERT_EQ(raw_pending_layer, pending_tree->root_layer());

  EXPECT_EQ(0u, raw_pending_layer->did_become_active_call_count());
  pending_tree->DidBecomeActive();
  EXPECT_EQ(1u, raw_pending_layer->did_become_active_call_count());

  scoped_ptr<FakePictureLayerImpl> mask_layer =
      FakePictureLayerImpl::Create(pending_tree, 11);
  FakePictureLayerImpl* raw_mask_layer = mask_layer.get();
  raw_pending_layer->SetMaskLayer(mask_layer.Pass());
  ASSERT_EQ(raw_mask_layer, raw_pending_layer->mask_layer());

  EXPECT_EQ(1u, raw_pending_layer->did_become_active_call_count());
  EXPECT_EQ(0u, raw_mask_layer->did_become_active_call_count());
  pending_tree->DidBecomeActive();
  EXPECT_EQ(2u, raw_pending_layer->did_become_active_call_count());
  EXPECT_EQ(1u, raw_mask_layer->did_become_active_call_count());

  scoped_ptr<FakePictureLayerImpl> replica_layer =
      FakePictureLayerImpl::Create(pending_tree, 12);
  scoped_ptr<FakePictureLayerImpl> replica_mask_layer =
      FakePictureLayerImpl::Create(pending_tree, 13);
  FakePictureLayerImpl* raw_replica_mask_layer = replica_mask_layer.get();
  replica_layer->SetMaskLayer(replica_mask_layer.Pass());
  raw_pending_layer->SetReplicaLayer(replica_layer.Pass());
  ASSERT_EQ(raw_replica_mask_layer,
            raw_pending_layer->replica_layer()->mask_layer());

  EXPECT_EQ(2u, raw_pending_layer->did_become_active_call_count());
  EXPECT_EQ(1u, raw_mask_layer->did_become_active_call_count());
  EXPECT_EQ(0u, raw_replica_mask_layer->did_become_active_call_count());
  pending_tree->DidBecomeActive();
  EXPECT_EQ(3u, raw_pending_layer->did_become_active_call_count());
  EXPECT_EQ(2u, raw_mask_layer->did_become_active_call_count());
  EXPECT_EQ(1u, raw_replica_mask_layer->did_become_active_call_count());
}

TEST_F(LayerTreeHostImplTest, WheelScrollWithPageScaleFactorOnInnerLayer) {
  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
  host_impl_->SetViewportSize(gfx::Size(50, 50));
  DrawFrame();

  EXPECT_EQ(scroll_layer, host_impl_->InnerViewportScrollLayer());

  float min_page_scale = 1.f, max_page_scale = 4.f;
  float page_scale_factor = 1.f;

  // The scroll deltas should have the page scale factor applied.
  {
    host_impl_->active_tree()->PushPageScaleFromMainThread(
        page_scale_factor, min_page_scale, max_page_scale);
    host_impl_->SetPageScaleOnActiveTree(page_scale_factor);
    scroll_layer->SetScrollDelta(gfx::Vector2d());

    float page_scale_delta = 2.f;
    host_impl_->ScrollBegin(gfx::Point(), InputHandler::Gesture);
    host_impl_->PinchGestureBegin();
    host_impl_->PinchGestureUpdate(page_scale_delta, gfx::Point());
    host_impl_->PinchGestureEnd();
    host_impl_->ScrollEnd();

    gfx::Vector2dF scroll_delta(0, 5);
    EXPECT_EQ(InputHandler::ScrollStarted,
              host_impl_->ScrollBegin(gfx::Point(), InputHandler::Wheel));
    EXPECT_VECTOR_EQ(gfx::Vector2dF(), scroll_layer->TotalScrollOffset());

    host_impl_->ScrollBy(gfx::Point(), scroll_delta);
    host_impl_->ScrollEnd();
    EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 2.5), scroll_layer->TotalScrollOffset());
  }
}

class LayerTreeHostImplCountingLostSurfaces : public LayerTreeHostImplTest {
 public:
  LayerTreeHostImplCountingLostSurfaces() : num_lost_surfaces_(0) {}
  void DidLoseOutputSurfaceOnImplThread() override { num_lost_surfaces_++; }

 protected:
  int num_lost_surfaces_;
};

TEST_F(LayerTreeHostImplCountingLostSurfaces, TwiceLostSurface) {
  // Really we just need at least one client notification each time
  // we go from having a valid output surface to not having a valid output
  // surface.
  EXPECT_EQ(0, num_lost_surfaces_);
  host_impl_->DidLoseOutputSurface();
  EXPECT_EQ(1, num_lost_surfaces_);
  host_impl_->DidLoseOutputSurface();
  EXPECT_LE(1, num_lost_surfaces_);
}

}  // namespace
}  // namespace cc