Implements MediaStreamVideoSource.

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 8d4fe56bdd811ccc2d6f4a1c6a07fbb25044fdb0..e67134cd2ccb323c02cf9c3203357cfc4df30f84 100644
--- a/content/renderer/media/media_stream_dependency_factory.cc
+++ b/content/renderer/media/media_stream_dependency_factory.cc
@@ -614,6 +614,28 @@ bool MediaStreamDependencyFactory::RemoveNativeMediaStreamTrack(
   return false;
 }
 
+blink::WebMediaStreamTrack
+    MediaStreamDependencyFactory::CreateMediaStreamVideoTrack(

[perkj_chrome, 2014/01/10 13:07:00]

I am not sure this belong here. The dependency factory was created originally to
wrap instansiating the webrtc classes. 

[Ronghua Wu (Left Chromium), 2014/01/11 01:22:58]

Not sure where else should I put this though. The comment for the dependency
factory does say "Object factory for RTC MediaStreams and RTC PeerConnections.".

+        const std::string& id) {
+  blink::WebMediaStreamTrack track;
+  blink::WebMediaStreamSource source;
+  blink::WebString idw(base::UTF8ToUTF16(id));
+  source.initialize(idw, blink::WebMediaStreamSource::TypeVideo, idw);
+  track.initialize(idw, source);
+  return track;
+}
+
+scoped_refptr<webrtc::VideoSourceInterface>
+    MediaStreamDependencyFactory::CreateVideoSource(

[perkj_chrome, 2014/01/10 13:07:00]

Make sure this method is used everywhere in this class to remove code
duplication.

[Ronghua Wu (Left Chromium), 2014/01/11 01:22:58]

Done.

+        cricket::VideoCapturer* capturer,
+        const blink::WebMediaConstraints& constraints) {
+  RTCMediaConstraints native_constraints(constraints);
+  // The video source takes ownership of |capturer|.
+  scoped_refptr<webrtc::VideoSourceInterface> source =
+      pc_factory_->CreateVideoSource(capturer, &native_constraints).get();
+  return source;
+}
+
 bool MediaStreamDependencyFactory::CreatePeerConnectionFactory() {
   DCHECK(!pc_factory_.get());
   DCHECK(!audio_device_.get());