RTCPeerConnection.addTrack and removeTrack added (behind flag)

content/renderer/media/rtc_peer_connection_handler.h

Index: content/renderer/media/rtc_peer_connection_handler.h
diff --git a/content/renderer/media/rtc_peer_connection_handler.h b/content/renderer/media/rtc_peer_connection_handler.h
index 89bcb951b77bfdb9c5599377bec91c75a4cc589a..5b7434c657885e63ed362a55e0dcc1b9f2302feb 100644
--- a/content/renderer/media/rtc_peer_connection_handler.h
+++ b/content/renderer/media/rtc_peer_connection_handler.h
@@ -152,6 +152,11 @@ class CONTENT_EXPORT RTCPeerConnectionHandler
       override;
   blink::WebVector<std::unique_ptr<blink::WebRTCRtpReceiver>> GetReceivers()
       override;
+  std::unique_ptr<blink::WebRTCRtpSender> AddTrack(
+      const blink::WebMediaStreamTrack& web_track,
+      const blink::WebVector<blink::WebMediaStream>& web_streams) override;
+  bool RemoveTrack(blink::WebRTCRtpSender* web_sender) override;
+
   blink::WebRTCDataChannelHandler* CreateDataChannel(
       const blink::WebString& label,
       const blink::WebRTCDataChannelInit& init) override;