RTCPeerConnection.addTrack and removeTrack added (behind flag)

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef RTCRtpSender_h
 #define RTCRtpSender_h
 
 #include "platform/bindings/ScriptWrappable.h"
 #include "platform/heap/GarbageCollected.h"
 #include "platform/heap/Member.h"
 #include "platform/heap/Visitor.h"
 #include "platform/wtf/text/WTFString.h"
 #include "public/platform/WebRTCRtpSender.h"
 
 namespace blink {
 
 class MediaStreamTrack;
 
 // https://w3c.github.io/webrtc-pc/#rtcrtpsender-interface
 class RTCRtpSender final : public GarbageCollectedFinalized<RTCRtpSender>,
                            public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   RTCRtpSender(std::unique_ptr<WebRTCRtpSender>, MediaStreamTrack*);
 
   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:
   std::unique_ptr<WebRTCRtpSender> sender_;
   Member<MediaStreamTrack> track_;
 };
 
 }  // namespace blink
 
 #endif  // RTCRtpSender_h