RTCPeerConnection.addTrack and removeTrack added (behind flag)

third_party/WebKit/public/platform/WebRTCPeerConnectionHandler.h

Index: third_party/WebKit/public/platform/WebRTCPeerConnectionHandler.h
diff --git a/third_party/WebKit/public/platform/WebRTCPeerConnectionHandler.h b/third_party/WebKit/public/platform/WebRTCPeerConnectionHandler.h
index eefeb6144256d6018fa8e1041a2351804825c9ae..70b2730784e8f25f88013115cc73aead840d5ca6 100644
--- a/third_party/WebKit/public/platform/WebRTCPeerConnectionHandler.h
+++ b/third_party/WebKit/public/platform/WebRTCPeerConnectionHandler.h
@@ -103,6 +103,14 @@ class WebRTCPeerConnectionHandler {
   // webrtc-layer receivers, multiple |WebRTCRtpReceiver| objects referencing
   // the same webrtc-layer receiver have the same |id|.
   virtual WebVector<std::unique_ptr<WebRTCRtpReceiver>> GetReceivers() = 0;
+  // Adds the track to the peer connection, returning the resulting sender on
+  // success and null on failure.
+  virtual std::unique_ptr<WebRTCRtpSender> AddTrack(
+      const WebMediaStreamTrack&,
+      const WebVector<WebMediaStream>&) = 0;
+  // Removes the sender, returning whether successful. On success, the sender's
+  // track must have been set to null.
+  virtual bool RemoveTrack(WebRTCRtpSender*) = 0;
   virtual WebRTCDTMFSenderHandler* CreateDTMFSender(
       const WebMediaStreamTrack&) = 0;
   virtual void Stop() = 0;