Move passing of WebRTC rendering frames to IO thread

content/renderer/media/media_stream_video_renderer_sink.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_MEDIA_RTC_VIDEO_RENDERER_H_
 #define CONTENT_RENDERER_MEDIA_RTC_VIDEO_RENDERER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
@@ skipping 29 matching lines @@
 // http://src.chromium.org/viewvc/chrome/trunk/src/content/renderer/media/rtc_vi
 // deo_decoder_unittest.cc?revision=180591&view=markup
 class CONTENT_EXPORT MediaStreamVideoRendererSink
     : NON_EXPORTED_BASE(public MediaStreamVideoRenderer),
       NON_EXPORTED_BASE(public MediaStreamVideoSink) {
  public:
   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);
 
   // MediaStreamVideoRenderer implementation. Called on the main thread.
   void Start() override;
   void Stop() override;
   void Resume() override;
   void Pause() override;
 
@@ skipping 23 matching lines @@
 
   // 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_;
   const scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
   const scoped_refptr<base::TaskRunner> worker_task_runner_;
   media::GpuVideoAcceleratorFactories* const gpu_factories_;
 
   base::ThreadChecker main_thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoRendererSink);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_RENDERER_H_