Exposing RtpSenders and RtpReceivers from PeerConnection.

talk/app/webrtc/test/fakemediastreamsignaling.h

Index: talk/app/webrtc/test/fakemediastreamsignaling.h
diff --git a/talk/app/webrtc/test/fakemediastreamsignaling.h b/talk/app/webrtc/test/fakemediastreamsignaling.h
index 7e13d4483b6659fa488d4409f7a1d827a9f73beb..58978fa72ad58d3927e115446d983fae76603132 100644
--- a/talk/app/webrtc/test/fakemediastreamsignaling.h
+++ b/talk/app/webrtc/test/fakemediastreamsignaling.h
@@ -93,21 +93,21 @@ class FakeMediaStreamSignaling : public webrtc::MediaStreamSignaling,
   }
   virtual void OnAddLocalAudioTrack(webrtc::MediaStreamInterface* stream,
                                     webrtc::AudioTrackInterface* audio_track,
-                                    uint32 ssrc) {
-  }
+                                    uint32 ssrc,
+                                    const std::string& mid) {}
   virtual void OnAddLocalVideoTrack(webrtc::MediaStreamInterface* stream,
                                     webrtc::VideoTrackInterface* video_track,
-                                    uint32 ssrc) {
-  }
+                                    uint32 ssrc,
+                                    const std::string& mid) {}
   virtual void OnAddRemoteAudioTrack(webrtc::MediaStreamInterface* stream,
                                      webrtc::AudioTrackInterface* audio_track,
-                                     uint32 ssrc) {
-  }
+                                     uint32 ssrc,
+                                     const std::string& mid) {}
 
   virtual void OnAddRemoteVideoTrack(webrtc::MediaStreamInterface* stream,
                                      webrtc::VideoTrackInterface* video_track,
-                                     uint32 ssrc) {
-  }
+                                     uint32 ssrc,
+                                     const std::string& mid) {}
 
   virtual void OnRemoveRemoteAudioTrack(
       webrtc::MediaStreamInterface* stream,