Ozone integration from chromium @ https://crrev.com/336230

Adds linux direct rendering capability via mesa gbm.

Refactored gpu_platform_support (and _host) to allow different
implementations of messaging transport between host and gpu.

drm_cursor is stubbed out.

Removed ScopedAllowIO in drm_host_display_manager and added
header documentation indicating where IO is performed.

Removed unused files:
 ui/ozone/common/gpu/ozone_gpu_message_generator*
 ui/ozone/common/gpu/ozone_gpu_messages.h

BUG=
R=jamesr@chromium.org, spang@chromium.org

Review URL: https://codereview.chromium.org/1285183008 .
diff --git a/device/udev_linux/udev.cc b/device/udev_linux/udev.cc
new file mode 100644
index 0000000..e2b93d2
--- /dev/null
+++ b/device/udev_linux/udev.cc
@@ -0,0 +1,183 @@
+// Copyright 2014 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 "device/udev_linux/udev.h"
+
+#include "base/strings/string_util.h"
+#include "device/udev_linux/udev_loader.h"
+
+namespace device {
+
+namespace {
+
+std::string StringOrEmptyIfNull(const char* value) {
+  return value ? value : std::string();
+}
+
+}  // namespace
+
+const char* udev_device_get_action(udev_device* udev_device) {
+  return UdevLoader::Get()->udev_device_get_action(udev_device);
+}
+
+const char* udev_device_get_devnode(udev_device* udev_device) {
+  return UdevLoader::Get()->udev_device_get_devnode(udev_device);
+}
+
+udev_device* udev_device_get_parent(udev_device* udev_device) {
+  return UdevLoader::Get()->udev_device_get_parent(udev_device);
+}
+
+udev_device* udev_device_get_parent_with_subsystem_devtype(
+    udev_device* udev_device,
+    const char* subsystem,
+    const char* devtype) {
+  return UdevLoader::Get()->udev_device_get_parent_with_subsystem_devtype(
+      udev_device, subsystem, devtype);
+}
+
+const char* udev_device_get_property_value(udev_device* udev_device,
+                                           const char* key) {
+  return UdevLoader::Get()->udev_device_get_property_value(udev_device, key);
+}
+
+const char* udev_device_get_subsystem(udev_device* udev_device) {
+  return UdevLoader::Get()->udev_device_get_subsystem(udev_device);
+}
+
+const char* udev_device_get_sysattr_value(udev_device* udev_device,
+                                          const char* sysattr) {
+  return UdevLoader::Get()->udev_device_get_sysattr_value(udev_device, sysattr);
+}
+
+const char* udev_device_get_sysname(udev_device* udev_device) {
+  return UdevLoader::Get()->udev_device_get_sysname(udev_device);
+}
+
+const char* udev_device_get_syspath(udev_device* udev_device) {
+  return UdevLoader::Get()->udev_device_get_syspath(udev_device);
+}
+
+udev_device* udev_device_new_from_devnum(udev* udev, char type, dev_t devnum) {
+  return UdevLoader::Get()->udev_device_new_from_devnum(udev, type, devnum);
+}
+
+udev_device* udev_device_new_from_subsystem_sysname(
+    udev* udev,
+    const char* subsystem,
+    const char* sysname) {
+  return UdevLoader::Get()->udev_device_new_from_subsystem_sysname(
+      udev, subsystem, sysname);
+}
+
+udev_device* udev_device_new_from_syspath(udev* udev, const char* syspath) {
+  return UdevLoader::Get()->udev_device_new_from_syspath(udev, syspath);
+}
+
+void udev_device_unref(udev_device* udev_device) {
+  UdevLoader::Get()->udev_device_unref(udev_device);
+}
+
+int udev_enumerate_add_match_subsystem(udev_enumerate* udev_enumerate,
+                                       const char* subsystem) {
+  return UdevLoader::Get()->udev_enumerate_add_match_subsystem(udev_enumerate,
+                                                               subsystem);
+}
+
+udev_list_entry* udev_enumerate_get_list_entry(udev_enumerate* udev_enumerate) {
+  return UdevLoader::Get()->udev_enumerate_get_list_entry(udev_enumerate);
+}
+
+udev_enumerate* udev_enumerate_new(udev* udev) {
+  return UdevLoader::Get()->udev_enumerate_new(udev);
+}
+
+int udev_enumerate_scan_devices(udev_enumerate* udev_enumerate) {
+  return UdevLoader::Get()->udev_enumerate_scan_devices(udev_enumerate);
+}
+
+void udev_enumerate_unref(udev_enumerate* udev_enumerate) {
+  UdevLoader::Get()->udev_enumerate_unref(udev_enumerate);
+}
+
+udev_list_entry* udev_list_entry_get_next(udev_list_entry* list_entry) {
+  return UdevLoader::Get()->udev_list_entry_get_next(list_entry);
+}
+
+const char* udev_list_entry_get_name(udev_list_entry* list_entry) {
+  return UdevLoader::Get()->udev_list_entry_get_name(list_entry);
+}
+
+int udev_monitor_enable_receiving(udev_monitor* udev_monitor) {
+  return UdevLoader::Get()->udev_monitor_enable_receiving(udev_monitor);
+}
+
+int udev_monitor_filter_add_match_subsystem_devtype(udev_monitor* udev_monitor,
+                                                    const char* subsystem,
+                                                    const char* devtype) {
+  return UdevLoader::Get()->udev_monitor_filter_add_match_subsystem_devtype(
+      udev_monitor, subsystem, devtype);
+}
+
+int udev_monitor_get_fd(udev_monitor* udev_monitor) {
+  return UdevLoader::Get()->udev_monitor_get_fd(udev_monitor);
+}
+
+udev_monitor* udev_monitor_new_from_netlink(udev* udev, const char* name) {
+  return UdevLoader::Get()->udev_monitor_new_from_netlink(udev, name);
+}
+
+udev_device* udev_monitor_receive_device(udev_monitor* udev_monitor) {
+  return UdevLoader::Get()->udev_monitor_receive_device(udev_monitor);
+}
+
+void udev_monitor_unref(udev_monitor* udev_monitor) {
+  UdevLoader::Get()->udev_monitor_unref(udev_monitor);
+}
+
+udev* udev_new() {
+  return UdevLoader::Get()->udev_new();
+}
+
+void udev_set_log_fn(
+    struct udev* udev,
+    void (*log_fn)(struct udev* udev, int priority, const char* file, int line,
+                   const char* fn, const char* format, va_list args)) {
+  return UdevLoader::Get()->udev_set_log_fn(udev, log_fn);
+}
+
+void udev_set_log_priority(struct udev* udev, int priority) {
+  return UdevLoader::Get()->udev_set_log_priority(udev, priority);
+}
+
+void udev_unref(udev* udev) {
+  UdevLoader::Get()->udev_unref(udev);
+}
+
+std::string UdevDeviceGetPropertyValue(udev_device* udev_device,
+                                       const char* key) {
+  return StringOrEmptyIfNull(udev_device_get_property_value(udev_device, key));
+}
+
+std::string UdevDeviceGetSysattrValue(udev_device* udev_device,
+                                      const char* key) {
+  return StringOrEmptyIfNull(udev_device_get_sysattr_value(udev_device, key));
+}
+
+std::string UdevDecodeString(const std::string& encoded) {
+  std::string decoded;
+  const size_t size = encoded.size();
+  for (size_t i = 0; i < size; ++i) {
+    char c = encoded[i];
+    if ((i + 3 < size) && c == '\\' && encoded[i + 1] == 'x') {
+      c = (HexDigitToInt(encoded[i + 2]) << 4) +
+          HexDigitToInt(encoded[i + 3]);
+      i += 3;
+    }
+    decoded.push_back(c);
+  }
+  return decoded;
+}
+
+}  // namespace device