Add a 'remote' property to MediaSourceInterface. Also adding an implementation to the relevant sour…

talk/app/webrtc/peerconnection.cc

Index: talk/app/webrtc/peerconnection.cc
diff --git a/talk/app/webrtc/peerconnection.cc b/talk/app/webrtc/peerconnection.cc
index 83e29191c8a2ac1b5003e5f684d7755250f11dec..564fd55810d068773fc578ea848ef6fca3809e68 100644
--- a/talk/app/webrtc/peerconnection.cc
+++ b/talk/app/webrtc/peerconnection.cc
@@ -462,7 +462,7 @@ class RemoteMediaStreamFactory {
     return AddTrack<VideoTrackInterface, VideoTrack, VideoTrackProxy>(
         stream, track_id,
         VideoSource::Create(channel_manager_, new RemoteVideoCapturer(),
-                            nullptr)
+                            nullptr, true)
             .get());
   }