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

content/renderer/media/webmediaplayer_ms.h

Index: content/renderer/media/webmediaplayer_ms.h
diff --git a/content/renderer/media/webmediaplayer_ms.h b/content/renderer/media/webmediaplayer_ms.h
index ba92086059b4a0febb21298d2fe64109e2172b5f..f5fc6d691c9b739063f48470eeeb04d40b7685a1 100644
--- a/content/renderer/media/webmediaplayer_ms.h
+++ b/content/renderer/media/webmediaplayer_ms.h
@@ -160,9 +160,14 @@ class CONTENT_EXPORT WebMediaPlayerMS
  private:
   friend class WebMediaPlayerMSTest;
 
-  // The callback for MediaStreamVideoRenderer to signal a new frame is
-  // available.
-  void OnFrameAvailable(const scoped_refptr<media::VideoFrame>& frame);
+  // Inner class used for transfering frames on compositor thread to
+  // |compositor_|.
+  class FrameDelivererOnCompositor;
+
+  void OnFirstFrameReceived(media::VideoRotation video_rotation,
+                            bool is_opaque);
+  void OnOpacityChanged(bool is_opaque);
+
   // Need repaint due to state change.
   void RepaintInternal();
 
@@ -193,6 +198,8 @@ class CONTENT_EXPORT WebMediaPlayerMS
   const base::WeakPtr<media::WebMediaPlayerDelegate> delegate_;
   int delegate_id_;
 
+  std::unique_ptr<FrameDelivererOnCompositor> frame_deliverer_;
+
   scoped_refptr<MediaStreamVideoRenderer> video_frame_provider_; // Weak
 
   std::unique_ptr<cc_blink::WebLayerImpl> video_weblayer_;
@@ -200,10 +207,7 @@ class CONTENT_EXPORT WebMediaPlayerMS
   scoped_refptr<MediaStreamAudioRenderer> audio_renderer_; // Weak
   media::SkCanvasVideoRenderer video_renderer_;
 
-  bool last_frame_opaque_;
   bool paused_;
-  bool render_frame_suspended_;
-  bool received_first_frame_;
   media::VideoRotation video_rotation_;
 
   scoped_refptr<media::MediaLog> media_log_;