Parse FlexFEC RTP headers in Call and add integration with BWE.

webrtc/api/call/flexfec_receive_stream.h

 /*
  *  Copyright (c) 2016 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 @@
     RtcpMode rtcp_mode = RtcpMode::kCompound;
 
     // Transport for outgoing RTCP packets.
     Transport* rtcp_send_transport = nullptr;
 
     // |transport_cc| is true whenever the send-side BWE RTCP feedback message
     // has been negotiated. This is a prerequisite for enabling send-side BWE.
     bool transport_cc = false;
 
     // RTP header extensions that have been negotiated for this track.
-    std::vector<RtpExtension> extensions;
+    std::vector<RtpExtension> rtp_header_extensions;

[brandtr, 2016/12/12 13:51:07]

Prior CLs required that this be named 'extensions'. That is no longer required,
so a more descriptive name is used here.

   };
 
   // Starts stream activity.
   // When a stream is active, it can receive and process packets.
   virtual void Start() = 0;
   // Stops stream activity.
   // When a stream is stopped, it can't receive nor process packets.
   virtual void Stop() = 0;
 
   virtual Stats GetStats() const = 0;
 
  protected:
   virtual ~FlexfecReceiveStream() = default;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_CALL_FLEXFEC_RECEIVE_STREAM_H_