Deliver video frames on libjingle worker thread to WebRtcVideoCapturerAdapter.

content/renderer/media/media_stream_dependency_factory.cc

Index: content/renderer/media/media_stream_dependency_factory.cc
diff --git a/content/renderer/media/media_stream_dependency_factory.cc b/content/renderer/media/media_stream_dependency_factory.cc
index 0b13677591bdc9f112b074d380a6557030c8c5a8..2e7e6d02bdfe819fd6d5569b9f6d4f530476d332 100644
--- a/content/renderer/media/media_stream_dependency_factory.cc
+++ b/content/renderer/media/media_stream_dependency_factory.cc
@@ -238,7 +238,8 @@ WebRtcVideoCapturerAdapter* MediaStreamDependencyFactory::CreateVideoCapturer(
   // cricket::VideoCapturer and it uses the libjingle thread wrappers.
   if (!GetPcFactory())
     return NULL;
-  return new WebRtcVideoCapturerAdapter(is_screeencast);
+  return new WebRtcVideoCapturerAdapter(GetWebRtcWorkerThread(),
+                                        is_screeencast);
 }
 
 scoped_refptr<webrtc::VideoSourceInterface>
@@ -601,6 +602,12 @@ void MediaStreamDependencyFactory::AddNativeAudioTrackToBlinkTrack(
           is_local_track));
 }
 
+scoped_refptr<base::MessageLoopProxy>
+MediaStreamDependencyFactory::GetWebRtcWorkerThread() const {
+  DCHECK(CalledOnValidThread());
+  return chrome_worker_thread_.message_loop_proxy();
+}
+
 bool MediaStreamDependencyFactory::OnControlMessageReceived(
     const IPC::Message& message) {
   bool handled = true;