Move passing of WebRTC rendering frames from main thread to compositor thread

content/renderer/media/media_stream_video_renderer_sink.h

Index: content/renderer/media/media_stream_video_renderer_sink.h
diff --git a/content/renderer/media/media_stream_video_renderer_sink.h b/content/renderer/media/media_stream_video_renderer_sink.h
index 425ca6cc2c25fa6fbd70f7e98a92ba611e09dd43..0bdf503cf0d233c8b2b5218ab890ffbaa2a70926 100644
--- a/content/renderer/media/media_stream_video_renderer_sink.h
+++ b/content/renderer/media/media_stream_video_renderer_sink.h
@@ -7,12 +7,11 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 #include "content/common/media/video_capture.h"
 #include "content/public/renderer/media_stream_video_renderer.h"
 #include "content/public/renderer/media_stream_video_sink.h"
-#include "media/video/gpu_memory_buffer_video_frame_pool.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "ui/gfx/geometry/size.h"
 
@@ -22,6 +21,7 @@ class TaskRunner;
 }  // namespace base
 
 namespace media {
+class GpuMemoryBufferVideoFramePool;
 class GpuVideoAcceleratorFactories;
 }  // namespace media
 
@@ -47,6 +47,7 @@ class CONTENT_EXPORT MediaStreamVideoRendererSink
       const blink::WebMediaStreamTrack& video_track,
       const base::Closure& error_cb,
       const MediaStreamVideoRenderer::RepaintCB& repaint_cb,
+      const scoped_refptr<base::SingleThreadTaskRunner>& compositor_task_runner,
       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
       const scoped_refptr<base::TaskRunner>& worker_task_runner,
       media::GpuVideoAcceleratorFactories* gpu_factories);
@@ -57,9 +58,6 @@ class CONTENT_EXPORT MediaStreamVideoRendererSink
   void Resume() override;
   void Pause() override;
 
-  void SetGpuMemoryBufferVideoForTesting(
-      media::GpuMemoryBufferVideoFramePool* gpu_memory_buffer_pool);
-
  protected:
   ~MediaStreamVideoRendererSink() override;
 
@@ -71,29 +69,32 @@ class CONTENT_EXPORT MediaStreamVideoRendererSink
     STOPPED,
   };
 
-  void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
-                    base::TimeTicks estimated_capture_time);
-  void FrameReady(const scoped_refptr<media::VideoFrame>& frame);
-
   // MediaStreamVideoSink implementation. Called on the main thread.
   void OnReadyStateChanged(
       blink::WebMediaStreamSource::ReadyState state) override;
 
   void RenderSignalingFrame();
 
+  // Helper methods used for testing
+  State GetStateForTesting();
+  void SetGpuMemoryBufferVideoForTesting(
+      media::GpuMemoryBufferVideoFramePool* gpu_memory_buffer_pool);
+
   const base::Closure error_cb_;
   const RepaintCB repaint_cb_;
-
-  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  State state_;
-  gfx::Size frame_size_;
   const blink::WebMediaStreamTrack video_track_;
 
-  // Pool of GpuMemoryBuffers and resources used to create hardware frames.
-  std::unique_ptr<media::GpuMemoryBufferVideoFramePool> gpu_memory_buffer_pool_;
-  const scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
-
-  base::WeakPtrFactory<MediaStreamVideoRendererSink> weak_factory_;
+  // Inner class used for trampolining received frames from IO thread to
+  // compositor thread.
+  class FrameReceiver;
+  std::unique_ptr<FrameReceiver> frame_receiver_;
+  // Inner class used for transfering frames on compositor thread and running
+  // |repaint_cb_|.
+  class FrameDeliverer;
+  std::unique_ptr<FrameDeliverer> frame_deliverer_;
+
+  const scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
+  base::ThreadChecker main_thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoRendererSink);
 };