Move passing of WebRTC rendering frames to IO thread

content/renderer/media/media_stream_renderer_factory_impl.cc

 // 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.
 
 #include "content/renderer/media/media_stream_renderer_factory_impl.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "content/renderer/media/media_stream.h"
 #include "content/renderer/media/media_stream_audio_track.h"
 #include "content/renderer/media/media_stream_video_renderer_sink.h"
@@ skipping 43 matching lines @@
 }
 
 MediaStreamRendererFactoryImpl::~MediaStreamRendererFactoryImpl() {
 }
 
 scoped_refptr<MediaStreamVideoRenderer>
 MediaStreamRendererFactoryImpl::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) {
   DCHECK(!web_stream.isNull());
 
   DVLOG(1) << "MediaStreamRendererFactoryImpl::GetVideoRenderer stream:"
            << base::UTF16ToUTF8(base::StringPiece16(web_stream.id()));
 
   blink::WebVector<blink::WebMediaStreamTrack> video_tracks;
   web_stream.videoTracks(video_tracks);
   if (video_tracks.isEmpty() ||
       !MediaStreamVideoTrack::GetTrack(video_tracks[0])) {
     return NULL;
   }
 
-  return new MediaStreamVideoRendererSink(
-      video_tracks[0], error_cb, repaint_cb, compositor_task_runner,
-      media_task_runner, worker_task_runner, gpu_factories);
+  return new MediaStreamVideoRendererSink(video_tracks[0], error_cb, repaint_cb,
+                                          media_task_runner, worker_task_runner,
+                                          gpu_factories);
 }
 
 scoped_refptr<MediaStreamAudioRenderer>
 MediaStreamRendererFactoryImpl::GetAudioRenderer(
     const blink::WebMediaStream& web_stream,
     int render_frame_id,
     const std::string& device_id,
     const url::Origin& security_origin) {
   DCHECK(!web_stream.isNull());
   blink::WebVector<blink::WebMediaStreamTrack> audio_tracks;
@@ skipping 50 matching lines @@
         device_id, security_origin);
 
     if (!audio_device->SetAudioRenderer(renderer.get()))
       return nullptr;
   }
 
   return renderer->CreateSharedAudioRendererProxy(web_stream);
 }
 
 }  // namespace content