Add VideoTrackSink interface to content/public

content/renderer/media/media_stream_impl.cc

Index: content/renderer/media/media_stream_impl.cc
diff --git a/content/renderer/media/media_stream_impl.cc b/content/renderer/media/media_stream_impl.cc
index c6c1454c5caf21ab4268052fcaa7e6f40ba2d845..a27b30b50a86459984e28afeacbcf03ac5a23eb6 100644
--- a/content/renderer/media/media_stream_impl.cc
+++ b/content/renderer/media/media_stream_impl.cc
@@ -242,11 +242,12 @@ MediaStreamImpl::GetVideoFrameProvider(
   DVLOG(1) << "MediaStreamImpl::GetVideoFrameProvider stream:"
            << UTF16ToUTF8(web_stream.id());
 
-  webrtc::MediaStreamInterface* stream = GetNativeMediaStream(web_stream);
-  if (stream)
-    return CreateVideoFrameProvider(stream, error_cb, repaint_cb);
-  NOTREACHED();
-  return NULL;
+  blink::WebVector<blink::WebMediaStreamTrack> video_tracks;
+  web_stream.videoTracks(video_tracks);
+  if (video_tracks.isEmpty())
+    return NULL;
+
+  return new RTCVideoRenderer(video_tracks[0], error_cb, repaint_cb);
 }
 
 scoped_refptr<MediaStreamAudioRenderer>
@@ -756,23 +757,6 @@ void MediaStreamImpl::StopUnreferencedSources(bool notify_dispatcher) {
   }
 }
 
-scoped_refptr<VideoFrameProvider>
-MediaStreamImpl::CreateVideoFrameProvider(
-    webrtc::MediaStreamInterface* stream,
-    const base::Closure& error_cb,
-    const VideoFrameProvider::RepaintCB& repaint_cb) {
-  if (stream->GetVideoTracks().empty())
-    return NULL;
-
-  DVLOG(1) << "MediaStreamImpl::CreateRemoteVideoFrameProvider label:"
-           << stream->label();
-
-  return new RTCVideoRenderer(
-      stream->GetVideoTracks()[0],
-      error_cb,
-      repaint_cb);
-}
-
 scoped_refptr<WebRtcAudioRenderer> MediaStreamImpl::CreateRemoteAudioRenderer(
     webrtc::MediaStreamInterface* stream) {
   if (stream->GetAudioTracks().empty())