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

content/public/renderer/media_stream_renderer_factory.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_RENDERER_FACTORY_H_
 #define CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_RENDERER_FACTORY_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 18 matching lines @@
 namespace content {
 
 // MediaStreamRendererFactory is used by WebMediaPlayerMS to create audio and
 // video feeds from a MediaStream provided an URL.
 // The factory methods are virtual in order for blink layouttests to be able to
 // override them.
 class MediaStreamRendererFactory {
  public:
   virtual ~MediaStreamRendererFactory() {}
 
+  // Returns a MediaStreamVideoRenderer that uses the given task runners.
+  // |compositor_task_runner| is used for passing video frames.
+  // |media_task_runner|, |worker_task_runner| and |gpu_factories| are used to
+  // create an GpuMemoryBufferVideoFramePool instance on supported platforms.
   virtual scoped_refptr<MediaStreamVideoRenderer> GetVideoRenderer(
       const blink::WebMediaStream& web_stream,
       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) = 0;
 
   virtual scoped_refptr<MediaStreamAudioRenderer> GetAudioRenderer(
       const blink::WebMediaStream& web_stream,
       int render_frame_id,
       const std::string& device_id,
       const url::Origin& security_origin) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_RENDERER_FACTORY_H_