gpu: Add IOSurface backed GpuMemoryBuffer implementation.

content/renderer/render_thread_impl.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/memory/memory_pressure_listener.h"
 #include "base/observer_list.h"
 #include "base/process/process_handle.h"
 #include "base/strings/string16.h"
+#include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
 #include "build/build_config.h"
 #include "content/child/child_thread.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/renderer/media/renderer_gpu_video_accelerator_factories.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ skipping 473 matching lines @@
   HistogramCustomizer histogram_customizer_;
 
   scoped_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 
   scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
 
   base::ProcessId renderer_process_id_;
 
+  // TODO(reveman): Allow AllocateGpuMemoryBuffer to be called from
+  // multiple threads. Current allocation mechanism for IOSurface
+  // backed GpuMemoryBuffers prevent this. crbug.com/325045
+  base::ThreadChecker allocate_gpu_memory_buffer_thread_checker_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_