// Copyright 2012 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.h"

#include "cc/animation/animation_curve.h"
#include "cc/animation/layer_animation_controller.h"
#include "cc/animation/scroll_offset_animation_curve.h"
#include "cc/animation/timing_function.h"
#include "cc/layers/layer.h"
#include "cc/layers/layer_impl.h"
#include "cc/test/animation_test_common.h"
#include "cc/test/fake_content_layer.h"
#include "cc/test/fake_content_layer_client.h"
#include "cc/test/layer_tree_test.h"
#include "cc/trees/layer_tree_impl.h"

namespace cc {
namespace {

class LayerTreeHostAnimationTest : public LayerTreeTest {
 public:
  virtual void SetupTree() override {
    LayerTreeTest::SetupTree();
    layer_tree_host()->root_layer()->set_layer_animation_delegate(this);
  }
};

// Makes sure that SetNeedsAnimate does not cause the CommitRequested() state to
// be set.
class LayerTreeHostAnimationTestSetNeedsAnimateShouldNotSetCommitRequested
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestSetNeedsAnimateShouldNotSetCommitRequested()
      : num_commits_(0) {}

  virtual void BeginTest() override {
    PostSetNeedsCommitToMainThread();
  }

  virtual void BeginMainFrame(const BeginFrameArgs& args) override {
    // We skip the first commit because its the commit that populates the
    // impl thread with a tree. After the second commit, the test is done.
    if (num_commits_ != 1)
      return;

    layer_tree_host()->SetNeedsAnimate();
    // Right now, CommitRequested is going to be true, because during
    // BeginFrame, we force CommitRequested to true to prevent requests from
    // hitting the impl thread. But, when the next DidCommit happens, we should
    // verify that CommitRequested has gone back to false.
  }

  virtual void DidCommit() override {
    if (!num_commits_) {
      EXPECT_FALSE(layer_tree_host()->CommitRequested());
      layer_tree_host()->SetNeedsAnimate();
      EXPECT_FALSE(layer_tree_host()->CommitRequested());
    }

    // Verifies that the SetNeedsAnimate we made in ::Animate did not
    // trigger CommitRequested.
    EXPECT_FALSE(layer_tree_host()->CommitRequested());
    EndTest();
    num_commits_++;
  }

  virtual void AfterTest() override {}

 private:
  int num_commits_;
};

MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestSetNeedsAnimateShouldNotSetCommitRequested);

// Trigger a frame with SetNeedsCommit. Then, inside the resulting animate
// callback, request another frame using SetNeedsAnimate. End the test when
// animate gets called yet-again, indicating that the proxy is correctly
// handling the case where SetNeedsAnimate() is called inside the BeginFrame
// flow.
class LayerTreeHostAnimationTestSetNeedsAnimateInsideAnimationCallback
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestSetNeedsAnimateInsideAnimationCallback()
      : num_begin_frames_(0) {}

  virtual void BeginTest() override {
    PostSetNeedsCommitToMainThread();
  }

  virtual void BeginMainFrame(const BeginFrameArgs& args) override {
    if (!num_begin_frames_) {
      layer_tree_host()->SetNeedsAnimate();
      num_begin_frames_++;
      return;
    }
    EndTest();
  }

  virtual void AfterTest() override {}

 private:
  int num_begin_frames_;
};

MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestSetNeedsAnimateInsideAnimationCallback);

// Add a layer animation and confirm that
// LayerTreeHostImpl::updateAnimationState does get called and continues to
// get called.
class LayerTreeHostAnimationTestAddAnimation
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestAddAnimation()
      : num_begin_frames_(0), received_animation_started_notification_(false) {}

  virtual void BeginTest() override {
    PostAddInstantAnimationToMainThread(layer_tree_host()->root_layer());
  }

  virtual void UpdateAnimationState(
      LayerTreeHostImpl* host_impl,
      bool has_unfinished_animation) override {
    if (!num_begin_frames_) {
      // The animation had zero duration so LayerTreeHostImpl should no
      // longer need to animate its layers.
      EXPECT_FALSE(has_unfinished_animation);
      num_begin_frames_++;
      return;
    }

    if (received_animation_started_notification_) {
      EXPECT_LT(base::TimeTicks(), start_time_);

      LayerAnimationController* controller_impl =
          host_impl->active_tree()->root_layer()->layer_animation_controller();
      Animation* animation_impl =
          controller_impl->GetAnimation(Animation::Opacity);
      if (animation_impl)
        controller_impl->RemoveAnimation(animation_impl->id());

      EndTest();
    }
  }

  virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                                      Animation::TargetProperty target_property,
                                      int group) override {
    received_animation_started_notification_ = true;
    start_time_ = monotonic_time;
    if (num_begin_frames_) {
      EXPECT_LT(base::TimeTicks(), start_time_);

      LayerAnimationController* controller =
          layer_tree_host()->root_layer()->layer_animation_controller();
      Animation* animation =
          controller->GetAnimation(Animation::Opacity);
      if (animation)
        controller->RemoveAnimation(animation->id());

      EndTest();
    }
  }

  virtual void AfterTest() override {}

 private:
  int num_begin_frames_;
  bool received_animation_started_notification_;
  base::TimeTicks start_time_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestAddAnimation);

// Add a layer animation to a layer, but continually fail to draw. Confirm that
// after a while, we do eventually force a draw.
class LayerTreeHostAnimationTestCheckerboardDoesNotStarveDraws
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestCheckerboardDoesNotStarveDraws()
      : started_animating_(false) {}

  virtual void BeginTest() override {
    PostAddAnimationToMainThread(layer_tree_host()->root_layer());
  }

  virtual void AnimateLayers(
      LayerTreeHostImpl* host_impl,
      base::TimeTicks monotonic_time) override {
    started_animating_ = true;
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* host_impl) override {
    if (started_animating_)
      EndTest();
  }

  virtual DrawResult PrepareToDrawOnThread(
      LayerTreeHostImpl* host_impl,
      LayerTreeHostImpl::FrameData* frame,
      DrawResult draw_result) override {
    return DRAW_ABORTED_CHECKERBOARD_ANIMATIONS;
  }

  virtual void AfterTest() override { }

 private:
  bool started_animating_;
};

// Starvation can only be an issue with the MT compositor.
MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestCheckerboardDoesNotStarveDraws);

// Ensures that animations eventually get deleted.
class LayerTreeHostAnimationTestAnimationsGetDeleted
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestAnimationsGetDeleted()
      : started_animating_(false) {}

  virtual void BeginTest() override {
    PostAddAnimationToMainThread(layer_tree_host()->root_layer());
  }

  virtual void AnimateLayers(
      LayerTreeHostImpl* host_impl,
      base::TimeTicks monotonic_time) override {
    bool have_animations = !host_impl->animation_registrar()->
        active_animation_controllers().empty();
    if (!started_animating_ && have_animations) {
      started_animating_ = true;
      return;
    }

    if (started_animating_ && !have_animations)
      EndTest();
  }

  virtual void NotifyAnimationFinished(
      base::TimeTicks monotonic_time,
      Animation::TargetProperty target_property,
      int group) override {
    // Animations on the impl-side controller only get deleted during a commit,
    // so we need to schedule a commit.
    layer_tree_host()->SetNeedsCommit();
  }

  virtual void AfterTest() override {}

 private:
  bool started_animating_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestAnimationsGetDeleted);

// Ensures that animations continue to be ticked when we are backgrounded.
class LayerTreeHostAnimationTestTickAnimationWhileBackgrounded
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestTickAnimationWhileBackgrounded()
      : num_begin_frames_(0) {}

  virtual void BeginTest() override {
    PostAddLongAnimationToMainThread(layer_tree_host()->root_layer());
  }

  // Use WillAnimateLayers to set visible false before the animation runs and
  // causes a commit, so we block the second visible animate in single-thread
  // mode.
  virtual void WillAnimateLayers(
      LayerTreeHostImpl* host_impl,
      base::TimeTicks monotonic_time) override {
    // Verify that the host can draw, it's just not visible.
    EXPECT_TRUE(host_impl->CanDraw());
    if (num_begin_frames_ < 2) {
      if (!num_begin_frames_) {
        // We have a long animation running. It should continue to tick even
        // if we are not visible.
        PostSetVisibleToMainThread(false);
      }
      num_begin_frames_++;
      return;
    }
    EndTest();
  }

  virtual void AfterTest() override {}

 private:
  int num_begin_frames_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestTickAnimationWhileBackgrounded);

// Ensures that animation time remains monotonic when we switch from foreground
// to background ticking and back, even if we're skipping draws due to
// checkerboarding when in the foreground.
class LayerTreeHostAnimationTestAnimationTickTimeIsMonotonic
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestAnimationTickTimeIsMonotonic()
      : has_background_ticked_(false), num_foreground_animates_(0) {}

  virtual void InitializeSettings(LayerTreeSettings* settings) override {
    // Make sure that drawing many times doesn't cause a checkerboarded
    // animation to start so we avoid flake in this test.
    settings->timeout_and_draw_when_animation_checkerboards = false;
  }

  virtual void BeginTest() override {
    PostAddLongAnimationToMainThread(layer_tree_host()->root_layer());
  }

  virtual void AnimateLayers(LayerTreeHostImpl* host_impl,
                             base::TimeTicks monotonic_time) override {
    EXPECT_GE(monotonic_time, last_tick_time_);
    last_tick_time_ = monotonic_time;
    if (host_impl->visible()) {
      num_foreground_animates_++;
      if (num_foreground_animates_ > 1 && !has_background_ticked_)
        PostSetVisibleToMainThread(false);
      else if (has_background_ticked_)
        EndTest();
    } else {
      has_background_ticked_ = true;
      PostSetVisibleToMainThread(true);
    }
  }

  virtual DrawResult PrepareToDrawOnThread(
      LayerTreeHostImpl* host_impl,
      LayerTreeHostImpl::FrameData* frame,
      DrawResult draw_result) override {
    if (TestEnded())
      return draw_result;
    return DRAW_ABORTED_CHECKERBOARD_ANIMATIONS;
  }

  virtual void AfterTest() override {}

 private:
  bool has_background_ticked_;
  int num_foreground_animates_;
  base::TimeTicks last_tick_time_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestAnimationTickTimeIsMonotonic);

// Ensures that animations do not tick when we are backgrounded and
// and we have an empty active tree.
class LayerTreeHostAnimationTestNoBackgroundTickingWithoutActiveTree
    : public LayerTreeHostAnimationTest {
 protected:
  LayerTreeHostAnimationTestNoBackgroundTickingWithoutActiveTree()
      : active_tree_was_animated_(false) {}

  virtual base::TimeDelta LowFrequencyAnimationInterval() const override {
    return base::TimeDelta::FromMilliseconds(4);
  }

  virtual void BeginTest() override {
    PostAddAnimationToMainThread(layer_tree_host()->root_layer());
  }

  virtual void NotifyAnimationFinished(
      base::TimeTicks monotonic_time,
      Animation::TargetProperty target_property,
      int group) override {
    // Replace animated commits with an empty tree.
    layer_tree_host()->SetRootLayer(make_scoped_refptr<Layer>(NULL));
  }

  virtual void DidCommit() override {
    // This alternates setting an empty tree and a non-empty tree with an
    // animation.
    switch (layer_tree_host()->source_frame_number()) {
      case 1:
        // Wait for NotifyAnimationFinished to commit an empty tree.
        break;
      case 2:
        SetupTree();
        AddOpacityTransitionToLayer(
            layer_tree_host()->root_layer(), 0.000001, 0, 0.5, true);
        break;
      case 3:
        // Wait for NotifyAnimationFinished to commit an empty tree.
        break;
      case 4:
        EndTest();
        break;
    }
  }

  virtual void BeginCommitOnThread(LayerTreeHostImpl* host_impl) override {
    // At the start of every commit, block activations and make sure
    // we are backgrounded.
    if (host_impl->settings().impl_side_painting)
      host_impl->BlockNotifyReadyToActivateForTesting(true);
    PostSetVisibleToMainThread(false);
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) override {
    if (!host_impl->settings().impl_side_painting) {
      // There are no activations to block if we're not impl-side-painting,
      // so just advance the test immediately.
      if (host_impl->active_tree()->source_frame_number() < 3)
        UnblockActivations(host_impl);
      return;
    }

    // We block activation for several ticks to make sure that, even though
    // there is a pending tree with animations, we still do not background
    // tick if the active tree is empty.
    if (host_impl->pending_tree()->source_frame_number() < 3) {
      base::MessageLoopProxy::current()->PostDelayedTask(
          FROM_HERE,
          base::Bind(
              &LayerTreeHostAnimationTestNoBackgroundTickingWithoutActiveTree::
                   UnblockActivations,
              base::Unretained(this),
              host_impl),
          4 * LowFrequencyAnimationInterval());
    }
  }

  virtual void UnblockActivations(LayerTreeHostImpl* host_impl) {
    if (host_impl->settings().impl_side_painting)
      host_impl->BlockNotifyReadyToActivateForTesting(false);
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* host_impl) override {
    active_tree_was_animated_ = false;

    // Verify that commits are actually alternating with empty / non-empty
    // trees.
    int frame_number = host_impl->active_tree()->source_frame_number();
    switch (frame_number) {
      case 0:
      case 2:
        EXPECT_TRUE(host_impl->active_tree()->root_layer())
            << "frame: " << frame_number;
        break;
      case 1:
      case 3:
        EXPECT_FALSE(host_impl->active_tree()->root_layer())
            << "frame: " << frame_number;
        break;
    }

    if (host_impl->active_tree()->source_frame_number() < 3) {
      // Initiate the next commit after a delay to give us a chance to
      // background tick if the active tree isn't empty.
      base::MessageLoopProxy::current()->PostDelayedTask(
          FROM_HERE,
          base::Bind(
              &LayerTreeHostAnimationTestNoBackgroundTickingWithoutActiveTree::
                   InitiateNextCommit,
              base::Unretained(this),
              host_impl),
          4 * LowFrequencyAnimationInterval());
    }
  }

  virtual void WillAnimateLayers(LayerTreeHostImpl* host_impl,
                                 base::TimeTicks monotonic_time) override {
    EXPECT_TRUE(host_impl->active_tree()->root_layer());
    active_tree_was_animated_ = true;
  }

  void InitiateNextCommit(LayerTreeHostImpl* host_impl) {
    // Verify that we actually animated when we should have.
    bool has_active_tree = host_impl->active_tree()->root_layer();
    EXPECT_EQ(has_active_tree, active_tree_was_animated_);

    // The next commit is blocked until we become visible again.
    PostSetVisibleToMainThread(true);
  }

  virtual void AfterTest() override {}

  bool active_tree_was_animated_;
};

SINGLE_AND_MULTI_THREAD_BLOCKNOTIFY_TEST_F(
    LayerTreeHostAnimationTestNoBackgroundTickingWithoutActiveTree);

// Ensure that an animation's timing function is respected.
class LayerTreeHostAnimationTestAddAnimationWithTimingFunction
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestAddAnimationWithTimingFunction() {}

  virtual void SetupTree() override {
    LayerTreeHostAnimationTest::SetupTree();
    content_ = FakeContentLayer::Create(&client_);
    content_->SetBounds(gfx::Size(4, 4));
    layer_tree_host()->root_layer()->AddChild(content_);
  }

  virtual void BeginTest() override {
    PostAddAnimationToMainThread(content_.get());
  }

  virtual void AnimateLayers(
      LayerTreeHostImpl* host_impl,
      base::TimeTicks monotonic_time) override {
    LayerAnimationController* controller_impl =
        host_impl->active_tree()->root_layer()->children()[0]->
        layer_animation_controller();
    Animation* animation =
        controller_impl->GetAnimation(Animation::Opacity);
    if (!animation)
      return;

    const FloatAnimationCurve* curve =
        animation->curve()->ToFloatAnimationCurve();
    float start_opacity = curve->GetValue(0.0);
    float end_opacity = curve->GetValue(curve->Duration());
    float linearly_interpolated_opacity =
        0.25f * end_opacity + 0.75f * start_opacity;
    double time = curve->Duration() * 0.25;
    // If the linear timing function associated with this animation was not
    // picked up, then the linearly interpolated opacity would be different
    // because of the default ease timing function.
    EXPECT_FLOAT_EQ(linearly_interpolated_opacity, curve->GetValue(time));

    EndTest();
  }

  virtual void AfterTest() override {}

  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> content_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestAddAnimationWithTimingFunction);

// Ensures that main thread animations have their start times synchronized with
// impl thread animations.
class LayerTreeHostAnimationTestSynchronizeAnimationStartTimes
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestSynchronizeAnimationStartTimes()
      : main_start_time_(-1.0),
        impl_start_time_(-1.0) {}

  virtual void SetupTree() override {
    LayerTreeHostAnimationTest::SetupTree();
    content_ = FakeContentLayer::Create(&client_);
    content_->SetBounds(gfx::Size(4, 4));
    content_->set_layer_animation_delegate(this);
    layer_tree_host()->root_layer()->AddChild(content_);
  }

  virtual void BeginTest() override {
    PostAddAnimationToMainThread(content_.get());
  }

  virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                                      Animation::TargetProperty target_property,
                                      int group) override {
    LayerAnimationController* controller =
        layer_tree_host()->root_layer()->children()[0]->
        layer_animation_controller();
    Animation* animation =
        controller->GetAnimation(Animation::Opacity);
    main_start_time_ =
        (animation->start_time() - base::TimeTicks()).InSecondsF();
    controller->RemoveAnimation(animation->id());

    if (impl_start_time_ > 0.0)
      EndTest();
  }

  virtual void UpdateAnimationState(
      LayerTreeHostImpl* impl_host,
      bool has_unfinished_animation) override {
    LayerAnimationController* controller =
        impl_host->active_tree()->root_layer()->children()[0]->
        layer_animation_controller();
    Animation* animation =
        controller->GetAnimation(Animation::Opacity);
    if (!animation)
      return;

    impl_start_time_ =
        (animation->start_time() - base::TimeTicks()).InSecondsF();
    controller->RemoveAnimation(animation->id());

    if (main_start_time_ > 0.0)
      EndTest();
  }

  virtual void AfterTest() override {
    EXPECT_FLOAT_EQ(impl_start_time_, main_start_time_);
  }

 private:
  double main_start_time_;
  double impl_start_time_;
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> content_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestSynchronizeAnimationStartTimes);

// Ensures that notify animation finished is called.
class LayerTreeHostAnimationTestAnimationFinishedEvents
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestAnimationFinishedEvents() {}

  virtual void BeginTest() override {
    PostAddInstantAnimationToMainThread(layer_tree_host()->root_layer());
  }

  virtual void NotifyAnimationFinished(
      base::TimeTicks monotonic_time,
      Animation::TargetProperty target_property,
      int group) override {
    LayerAnimationController* controller =
        layer_tree_host()->root_layer()->layer_animation_controller();
    Animation* animation =
        controller->GetAnimation(Animation::Opacity);
    if (animation)
      controller->RemoveAnimation(animation->id());
    EndTest();
  }

  virtual void AfterTest() override {}
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestAnimationFinishedEvents);

// Ensures that when opacity is being animated, this value does not cause the
// subtree to be skipped.
class LayerTreeHostAnimationTestDoNotSkipLayersWithAnimatedOpacity
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestDoNotSkipLayersWithAnimatedOpacity()
      : update_check_layer_(FakeContentLayer::Create(&client_)) {
  }

  virtual void SetupTree() override {
    update_check_layer_->SetOpacity(0.f);
    layer_tree_host()->SetRootLayer(update_check_layer_);
    LayerTreeHostAnimationTest::SetupTree();
  }

  virtual void BeginTest() override {
    PostAddAnimationToMainThread(update_check_layer_.get());
  }

  virtual void DidActivateTreeOnThread(LayerTreeHostImpl* host_impl) override {
    LayerAnimationController* controller_impl =
        host_impl->active_tree()->root_layer()->layer_animation_controller();
    Animation* animation_impl =
        controller_impl->GetAnimation(Animation::Opacity);
    controller_impl->RemoveAnimation(animation_impl->id());
    EndTest();
  }

  virtual void AfterTest() override {
    // Update() should have been called once, proving that the layer was not
    // skipped.
    EXPECT_EQ(1u, update_check_layer_->update_count());

    // clear update_check_layer_ so LayerTreeHost dies.
    update_check_layer_ = NULL;
  }

 private:
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> update_check_layer_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestDoNotSkipLayersWithAnimatedOpacity);

// Layers added to tree with existing active animations should have the
// animation correctly recognized.
class LayerTreeHostAnimationTestLayerAddedWithAnimation
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestLayerAddedWithAnimation() {}

  virtual void BeginTest() override {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidCommit() override {
    if (layer_tree_host()->source_frame_number() == 1) {
      scoped_refptr<Layer> layer = Layer::Create();
      layer->set_layer_animation_delegate(this);

      // Any valid AnimationCurve will do here.
      scoped_ptr<AnimationCurve> curve(new FakeFloatAnimationCurve());
      scoped_ptr<Animation> animation(
          Animation::Create(curve.Pass(), 1, 1,
                                  Animation::Opacity));
      layer->layer_animation_controller()->AddAnimation(animation.Pass());

      // We add the animation *before* attaching the layer to the tree.
      layer_tree_host()->root_layer()->AddChild(layer);
    }
  }

  virtual void AnimateLayers(
      LayerTreeHostImpl* impl_host,
      base::TimeTicks monotonic_time) override {
    EndTest();
  }

  virtual void AfterTest() override {}
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestLayerAddedWithAnimation);

class LayerTreeHostAnimationTestCancelAnimateCommit
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestCancelAnimateCommit()
      : num_begin_frames_(0), num_commit_calls_(0), num_draw_calls_(0) {}

  virtual void BeginTest() override { PostSetNeedsCommitToMainThread(); }

  virtual void BeginMainFrame(const BeginFrameArgs& args) override {
    num_begin_frames_++;
    // No-op animate will cancel the commit.
    if (layer_tree_host()->source_frame_number() == 1) {
      EndTest();
      return;
    }
    layer_tree_host()->SetNeedsAnimate();
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) override {
    num_commit_calls_++;
    if (impl->active_tree()->source_frame_number() > 1)
      FAIL() << "Commit should have been canceled.";
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
    num_draw_calls_++;
    if (impl->active_tree()->source_frame_number() > 1)
      FAIL() << "Draw should have been canceled.";
  }

  virtual void AfterTest() override {
    EXPECT_EQ(2, num_begin_frames_);
    EXPECT_EQ(1, num_commit_calls_);
    EXPECT_EQ(1, num_draw_calls_);
  }

 private:
  int num_begin_frames_;
  int num_commit_calls_;
  int num_draw_calls_;
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> content_;
};

MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestCancelAnimateCommit);

class LayerTreeHostAnimationTestForceRedraw
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestForceRedraw()
      : num_animate_(0), num_draw_layers_(0) {}

  virtual void BeginTest() override { PostSetNeedsCommitToMainThread(); }

  virtual void BeginMainFrame(const BeginFrameArgs& args) override {
    if (++num_animate_ < 2)
      layer_tree_host()->SetNeedsAnimate();
  }

  virtual void Layout() override {
    layer_tree_host()->SetNextCommitForcesRedraw();
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
    if (++num_draw_layers_ == 2)
      EndTest();
  }

  virtual void AfterTest() override {
    // The first commit will always draw; make sure the second draw triggered
    // by the animation was not cancelled.
    EXPECT_EQ(2, num_draw_layers_);
    EXPECT_EQ(2, num_animate_);
  }

 private:
  int num_animate_;
  int num_draw_layers_;
};

MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestForceRedraw);

class LayerTreeHostAnimationTestAnimateAfterSetNeedsCommit
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestAnimateAfterSetNeedsCommit()
      : num_animate_(0), num_draw_layers_(0) {}

  virtual void BeginTest() override { PostSetNeedsCommitToMainThread(); }

  virtual void BeginMainFrame(const BeginFrameArgs& args) override {
    if (++num_animate_ <= 2) {
      layer_tree_host()->SetNeedsCommit();
      layer_tree_host()->SetNeedsAnimate();
    }
  }

  virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
    if (++num_draw_layers_ == 2)
      EndTest();
  }

  virtual void AfterTest() override {
    // The first commit will always draw; make sure the second draw triggered
    // by the SetNeedsCommit was not cancelled.
    EXPECT_EQ(2, num_draw_layers_);
    EXPECT_GE(num_animate_, 2);
  }

 private:
  int num_animate_;
  int num_draw_layers_;
};

MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestAnimateAfterSetNeedsCommit);

// Make sure the main thread can still execute animations when CanDraw() is not
// true.
class LayerTreeHostAnimationTestRunAnimationWhenNotCanDraw
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestRunAnimationWhenNotCanDraw() : started_times_(0) {}

  virtual void SetupTree() override {
    LayerTreeHostAnimationTest::SetupTree();
    content_ = FakeContentLayer::Create(&client_);
    content_->SetBounds(gfx::Size(4, 4));
    content_->set_layer_animation_delegate(this);
    layer_tree_host()->root_layer()->AddChild(content_);
  }

  virtual void BeginTest() override {
    layer_tree_host()->SetViewportSize(gfx::Size());
    PostAddAnimationToMainThread(content_.get());
  }

  virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                                      Animation::TargetProperty target_property,
                                      int group) override {
    started_times_++;
  }

  virtual void NotifyAnimationFinished(
      base::TimeTicks monotonic_time,
      Animation::TargetProperty target_property,
      int group) override {
    EndTest();
  }

  virtual void AfterTest() override {
    EXPECT_EQ(1, started_times_);
  }

 private:
  int started_times_;
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> content_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestRunAnimationWhenNotCanDraw);

// Make sure the main thread can still execute animations when the renderer is
// backgrounded.
class LayerTreeHostAnimationTestRunAnimationWhenNotVisible
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestRunAnimationWhenNotVisible() : started_times_(0) {}

  virtual void SetupTree() override {
    LayerTreeHostAnimationTest::SetupTree();
    content_ = FakeContentLayer::Create(&client_);
    content_->SetBounds(gfx::Size(4, 4));
    content_->set_layer_animation_delegate(this);
    layer_tree_host()->root_layer()->AddChild(content_);
  }

  virtual void BeginTest() override {
    visible_ = true;
    PostAddAnimationToMainThread(content_.get());
  }

  virtual void DidCommit() override {
    visible_ = false;
    layer_tree_host()->SetVisible(false);
  }

  virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                                      Animation::TargetProperty target_property,
                                      int group) override {
    EXPECT_FALSE(visible_);
    started_times_++;
  }

  virtual void NotifyAnimationFinished(
      base::TimeTicks monotonic_time,
      Animation::TargetProperty target_property,
      int group) override {
    EXPECT_FALSE(visible_);
    EXPECT_EQ(1, started_times_);
    EndTest();
  }

  virtual void AfterTest() override {}

 private:
  bool visible_;
  int started_times_;
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> content_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestRunAnimationWhenNotVisible);

// Animations should not be started when frames are being skipped due to
// checkerboard.
class LayerTreeHostAnimationTestCheckerboardDoesntStartAnimations
    : public LayerTreeHostAnimationTest {
  virtual void SetupTree() override {
    LayerTreeHostAnimationTest::SetupTree();
    content_ = FakeContentLayer::Create(&client_);
    content_->SetBounds(gfx::Size(4, 4));
    content_->set_layer_animation_delegate(this);
    layer_tree_host()->root_layer()->AddChild(content_);
  }

  virtual void InitializeSettings(LayerTreeSettings* settings) override {
    // Make sure that drawing many times doesn't cause a checkerboarded
    // animation to start so we avoid flake in this test.
    settings->timeout_and_draw_when_animation_checkerboards = false;
  }

  virtual void BeginTest() override {
    prevented_draw_ = 0;
    added_animations_ = 0;
    started_times_ = 0;

    PostSetNeedsCommitToMainThread();
  }

  virtual DrawResult PrepareToDrawOnThread(
      LayerTreeHostImpl* host_impl,
      LayerTreeHostImpl::FrameData* frame_data,
      DrawResult draw_result) override {
    if (added_animations_ < 2)
      return draw_result;
    if (TestEnded())
      return draw_result;
    // Act like there is checkerboard when the second animation wants to draw.
    ++prevented_draw_;
    if (prevented_draw_ > 2)
      EndTest();
    return DRAW_ABORTED_CHECKERBOARD_ANIMATIONS;
  }

  virtual void DidCommitAndDrawFrame() override {
    switch (layer_tree_host()->source_frame_number()) {
      case 1:
        // The animation is longer than 1 BeginFrame interval.
        AddOpacityTransitionToLayer(content_.get(), 0.1, 0.2f, 0.8f, false);
        added_animations_++;
        break;
      case 2:
        // This second animation will not be drawn so it should not start.
        AddAnimatedTransformToLayer(content_.get(), 0.1, 5, 5);
        added_animations_++;
        break;
    }
  }

  virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                                      Animation::TargetProperty target_property,
                                      int group) override {
    if (TestEnded())
      return;
    started_times_++;
  }

  virtual void AfterTest() override {
    // Make sure we tried to draw the second animation but failed.
    EXPECT_LT(0, prevented_draw_);
    // The first animation should be started, but the second should not because
    // of checkerboard.
    EXPECT_EQ(1, started_times_);
  }

  int prevented_draw_;
  int added_animations_;
  int started_times_;
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> content_;
};

MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestCheckerboardDoesntStartAnimations);

// Verifies that scroll offset animations are only accepted when impl-scrolling
// is supported, and that when scroll offset animations are accepted,
// scroll offset updates are sent back to the main thread.
class LayerTreeHostAnimationTestScrollOffsetChangesArePropagated
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestScrollOffsetChangesArePropagated() {}

  virtual void SetupTree() override {
    LayerTreeHostAnimationTest::SetupTree();

    scroll_layer_ = FakeContentLayer::Create(&client_);
    scroll_layer_->SetScrollClipLayerId(layer_tree_host()->root_layer()->id());
    scroll_layer_->SetBounds(gfx::Size(1000, 1000));
    scroll_layer_->SetScrollOffset(gfx::ScrollOffset(10, 20));
    layer_tree_host()->root_layer()->AddChild(scroll_layer_);
  }

  virtual void BeginTest() override {
    PostSetNeedsCommitToMainThread();
  }

  virtual void DidCommit() override {
    switch (layer_tree_host()->source_frame_number()) {
      case 1: {
        scoped_ptr<ScrollOffsetAnimationCurve> curve(
            ScrollOffsetAnimationCurve::Create(
                gfx::ScrollOffset(500.f, 550.f),
                EaseInOutTimingFunction::Create()));
        scoped_ptr<Animation> animation(
            Animation::Create(curve.Pass(), 1, 0, Animation::ScrollOffset));
        animation->set_needs_synchronized_start_time(true);
        bool animation_added = scroll_layer_->AddAnimation(animation.Pass());
        bool impl_scrolling_supported =
            layer_tree_host()->proxy()->SupportsImplScrolling();
        EXPECT_EQ(impl_scrolling_supported, animation_added);
        if (!impl_scrolling_supported)
          EndTest();
        break;
      }
      default:
        if (scroll_layer_->scroll_offset().x() > 10 &&
            scroll_layer_->scroll_offset().y() > 20)
          EndTest();
    }
  }

  virtual void AfterTest() override {}

 private:
  FakeContentLayerClient client_;
  scoped_refptr<FakeContentLayer> scroll_layer_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestScrollOffsetChangesArePropagated);

// When animations are simultaneously added to an existing layer and to a new
// layer, they should start at the same time, even when there's already a
// running animation on the existing layer.
class LayerTreeHostAnimationTestAnimationsAddedToNewAndExistingLayers
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestAnimationsAddedToNewAndExistingLayers()
      : frame_count_with_pending_tree_(0) {}

  virtual void BeginTest() override { PostSetNeedsCommitToMainThread(); }

  virtual void DidCommit() override {
    if (layer_tree_host()->source_frame_number() == 1) {
      AddAnimatedTransformToLayer(layer_tree_host()->root_layer(), 4, 1, 1);
    } else if (layer_tree_host()->source_frame_number() == 2) {
      AddOpacityTransitionToLayer(
          layer_tree_host()->root_layer(), 1, 0.f, 0.5f, true);

      scoped_refptr<Layer> layer = Layer::Create();
      layer_tree_host()->root_layer()->AddChild(layer);
      layer->set_layer_animation_delegate(this);
      layer->SetBounds(gfx::Size(4, 4));
      AddOpacityTransitionToLayer(layer.get(), 1, 0.f, 0.5f, true);
    }
  }

  virtual void BeginCommitOnThread(LayerTreeHostImpl* host_impl) override {
    if (host_impl->settings().impl_side_painting)
      host_impl->BlockNotifyReadyToActivateForTesting(true);
  }

  virtual void CommitCompleteOnThread(LayerTreeHostImpl* host_impl) override {
    // For the commit that added animations to new and existing layers, keep
    // blocking activation. We want to verify that even with activation blocked,
    // the animation on the layer that's already in the active tree won't get a
    // head start.
    if (host_impl->settings().impl_side_painting &&
        host_impl->pending_tree()->source_frame_number() != 2) {
      host_impl->BlockNotifyReadyToActivateForTesting(false);
    }
  }

  virtual void WillBeginImplFrameOnThread(LayerTreeHostImpl* host_impl,
                                          const BeginFrameArgs& args) override {
    if (!host_impl->pending_tree() ||
        host_impl->pending_tree()->source_frame_number() != 2)
      return;

    frame_count_with_pending_tree_++;
    if (frame_count_with_pending_tree_ == 2 &&
        host_impl->settings().impl_side_painting) {
      host_impl->BlockNotifyReadyToActivateForTesting(false);
    }
  }

  virtual void UpdateAnimationState(LayerTreeHostImpl* host_impl,
                                    bool has_unfinished_animation) override {
    LayerAnimationController* root_controller_impl =
        host_impl->active_tree()->root_layer()->layer_animation_controller();
    Animation* root_animation =
        root_controller_impl->GetAnimation(Animation::Opacity);
    if (!root_animation || root_animation->run_state() != Animation::Running)
      return;

    LayerAnimationController* child_controller_impl =
        host_impl->active_tree()->root_layer()->children()
            [0]->layer_animation_controller();
    Animation* child_animation =
        child_controller_impl->GetAnimation(Animation::Opacity);
    EXPECT_EQ(Animation::Running, child_animation->run_state());
    EXPECT_EQ(root_animation->start_time(), child_animation->start_time());
    root_controller_impl->AbortAnimations(Animation::Opacity);
    root_controller_impl->AbortAnimations(Animation::Transform);
    child_controller_impl->AbortAnimations(Animation::Opacity);
    EndTest();
  }

  virtual void AfterTest() override {}

 private:
  int frame_count_with_pending_tree_;
};

SINGLE_AND_MULTI_THREAD_BLOCKNOTIFY_TEST_F(
    LayerTreeHostAnimationTestAnimationsAddedToNewAndExistingLayers);

class LayerTreeHostAnimationTestAddAnimationAfterAnimating
    : public LayerTreeHostAnimationTest {
 public:
  LayerTreeHostAnimationTestAddAnimationAfterAnimating()
      : num_swap_buffers_(0) {}

  virtual void SetupTree() override {
    LayerTreeHostAnimationTest::SetupTree();
    content_ = Layer::Create();
    content_->SetBounds(gfx::Size(4, 4));
    layer_tree_host()->root_layer()->AddChild(content_);
  }

  virtual void BeginTest() override { PostSetNeedsCommitToMainThread(); }

  virtual void DidCommit() override {
    switch (layer_tree_host()->source_frame_number()) {
      case 1:
        // First frame: add an animation to the root layer.
        AddAnimatedTransformToLayer(layer_tree_host()->root_layer(), 0.1, 5, 5);
        break;
      case 2:
        // Second frame: add an animation to the content layer. The root layer
        // animation has caused us to animate already during this frame.
        AddOpacityTransitionToLayer(content_.get(), 0.1, 5, 5, false);
        break;
    }
  }

  virtual void SwapBuffersOnThread(LayerTreeHostImpl* host_impl,
                                   bool result) override {
    // After both animations have started, verify that they have valid
    // start times.
    num_swap_buffers_++;
    AnimationRegistrar::AnimationControllerMap copy =
        host_impl->animation_registrar()->active_animation_controllers();
    if (copy.size() == 2u) {
      EndTest();
      EXPECT_GE(num_swap_buffers_, 3);
      for (AnimationRegistrar::AnimationControllerMap::iterator iter =
               copy.begin();
           iter != copy.end();
           ++iter) {
        int id = ((*iter).second->id());
        if (id == host_impl->RootLayer()->id()) {
          Animation* anim = (*iter).second->GetAnimation(Animation::Transform);
          EXPECT_GT((anim->start_time() - base::TimeTicks()).InSecondsF(), 0);
        } else if (id == host_impl->RootLayer()->children()[0]->id()) {
          Animation* anim = (*iter).second->GetAnimation(Animation::Opacity);
          EXPECT_GT((anim->start_time() - base::TimeTicks()).InSecondsF(), 0);
        }
      }
    }
  }

  virtual void AfterTest() override {}

 private:
  scoped_refptr<Layer> content_;
  int num_swap_buffers_;
};

SINGLE_AND_MULTI_THREAD_TEST_F(
    LayerTreeHostAnimationTestAddAnimationAfterAnimating);

}  // namespace
}  // namespace cc