Added a callback function OnAddTrack to PeerConnectionObserver

webrtc/api/test/peerconnectiontestwrapper.h

 /*
  *  Copyright 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 47 matching lines @@
       rtc::scoped_refptr<webrtc::MediaStreamInterface> stream) {}
   virtual void OnDataChannel(
       rtc::scoped_refptr<webrtc::DataChannelInterface> data_channel);
   virtual void OnRenegotiationNeeded() {}
   virtual void OnIceConnectionChange(
       webrtc::PeerConnectionInterface::IceConnectionState new_state) {}
   virtual void OnIceGatheringChange(
       webrtc::PeerConnectionInterface::IceGatheringState new_state) {}
   virtual void OnIceCandidate(const webrtc::IceCandidateInterface* candidate);
   virtual void OnIceComplete() {}
+  virtual void OnAddTrack(
+      rtc::scoped_refptr<webrtc::RtpReceiverInterface> receiver,
+      std::vector<rtc::scoped_refptr<webrtc::MediaStreamInterface>> streams) {}
 
   // Implements CreateSessionDescriptionObserver.
   virtual void OnSuccess(webrtc::SessionDescriptionInterface* desc);
   virtual void OnFailure(const std::string& error) {}
 
   void CreateOffer(const webrtc::MediaConstraintsInterface* constraints);
   void CreateAnswer(const webrtc::MediaConstraintsInterface* constraints);
   void ReceiveOfferSdp(const std::string& sdp);
   void ReceiveAnswerSdp(const std::string& sdp);
   void AddIceCandidate(const std::string& sdp_mid, int sdp_mline_index,
@@ skipping 29 matching lines @@
   rtc::Thread* const network_thread_;
   rtc::Thread* const worker_thread_;
   rtc::scoped_refptr<webrtc::PeerConnectionInterface> peer_connection_;
   rtc::scoped_refptr<webrtc::PeerConnectionFactoryInterface>
       peer_connection_factory_;
   rtc::scoped_refptr<FakeAudioCaptureModule> fake_audio_capture_module_;
   std::unique_ptr<webrtc::FakeVideoTrackRenderer> renderer_;
 };
 
 #endif  // WEBRTC_API_TEST_PEERCONNECTIONTESTWRAPPER_H_