Interface RTCRtpReceiver and RTCPeerConnection.getReceivers() added.

content/shell/test_runner/mock_webrtc_peer_connection_handler.h

Index: content/shell/test_runner/mock_webrtc_peer_connection_handler.h
diff --git a/content/shell/test_runner/mock_webrtc_peer_connection_handler.h b/content/shell/test_runner/mock_webrtc_peer_connection_handler.h
index 4dd5c929a67c8403111eb590e7b757bb42265d7c..f4004c9efbdcba095f559935c6b758346a47de02 100644
--- a/content/shell/test_runner/mock_webrtc_peer_connection_handler.h
+++ b/content/shell/test_runner/mock_webrtc_peer_connection_handler.h
@@ -61,6 +61,8 @@ class MockWebRTCPeerConnectionHandler
   void removeStream(const blink::WebMediaStream& stream) override;
   void getStats(const blink::WebRTCStatsRequest& request) override;
   void getStats(std::unique_ptr<blink::WebRTCStatsReportCallback>) override;
+  blink::WebVector<std::unique_ptr<blink::WebRTCRtpReceiver>> getReceivers()
+      override;
   blink::WebRTCDataChannelHandler* createDataChannel(
       const blink::WebString& label,
       const blink::WebRTCDataChannelInit& init) override;
@@ -97,6 +99,7 @@ class MockWebRTCPeerConnectionHandler
   typedef std::map<std::string, blink::WebMediaStream> StreamMap;
   StreamMap local_streams_;
   StreamMap remote_streams_;
+  std::map<std::string, uintptr_t> receiver_id_by_track_;
 
   base::WeakPtrFactory<MockWebRTCPeerConnectionHandler> weak_factory_;