RTCPeerConnection.addTrack and removeTrack added (behind flag)

third_party/WebKit/Source/modules/peerconnection/RTCRtpSender.h

Index: third_party/WebKit/Source/modules/peerconnection/RTCRtpSender.h
diff --git a/third_party/WebKit/Source/modules/peerconnection/RTCRtpSender.h b/third_party/WebKit/Source/modules/peerconnection/RTCRtpSender.h
index ce79a2cc28788343930342b4caae19accd1aede4..576c212712b707596052a56df3c8e39da934ba8d 100644
--- a/third_party/WebKit/Source/modules/peerconnection/RTCRtpSender.h
+++ b/third_party/WebKit/Source/modules/peerconnection/RTCRtpSender.h
@@ -26,6 +26,11 @@ class RTCRtpSender final : public GarbageCollectedFinalized<RTCRtpSender>,
 
   MediaStreamTrack* track();
 
+  WebRTCRtpSender* web_rtp_sender();
+  // Sets the track. This must be called when the |WebRTCRtpSender| has its
+  // track updated, and the |track| must match the |WebRTCRtpSender::Track|.
+  void SetTrack(MediaStreamTrack*);
+
   DECLARE_VIRTUAL_TRACE();
 
  private: