Change VideoRtpReceiver to create remote VideoTrack and VideoTrackSource.

webrtc/api/peerconnection.h

Index: webrtc/api/peerconnection.h
diff --git a/webrtc/api/peerconnection.h b/webrtc/api/peerconnection.h
index e4fcdf075a0dc025f337e14f473d7c9eeb6203d5..8b9d05f49812789d7c2c78f25c6ad5d8008e2387 100644
--- a/webrtc/api/peerconnection.h
+++ b/webrtc/api/peerconnection.h
@@ -27,6 +27,7 @@ namespace webrtc {
 
 class MediaStreamObserver;
 class RemoteMediaStreamFactory;
+class VideoRtpReceiver;
 
 // Populates |session_options| from |rtc_options|, and returns true if options
 // are valid.
@@ -167,9 +168,8 @@ class PeerConnection : public PeerConnectionInterface,
   void CreateAudioReceiver(MediaStreamInterface* stream,
                            AudioTrackInterface* audio_track,
                            uint32_t ssrc);
-  void CreateVideoReceiver(MediaStreamInterface* stream,
-                           VideoTrackInterface* video_track,
-                           uint32_t ssrc);
+  VideoRtpReceiver* CreateVideoReceiver(const std::string& track_id,
+                                        uint32_t ssrc);

[pthatcher1, 2016/03/09 18:16:49]

Can you add a comment explaining that this is the value that should be in
VideoRtpReceiver.track().id(), and that we need to pass it into the RtpReceiver
because PeerConnection allows this to be set via SetRemoteDescription.

   void DestroyAudioReceiver(MediaStreamInterface* stream,
                             AudioTrackInterface* audio_track);
   void DestroyVideoReceiver(MediaStreamInterface* stream,