Require negotiation to send transport cc feedback over RTCP.

talk/media/webrtc/webrtcvideoengine2.h

 /*
  * libjingle
  * Copyright 2014 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 383 matching lines @@
         const StreamParams& sp,
         const webrtc::VideoReceiveStream::Config& config,
         WebRtcVideoDecoderFactory* external_decoder_factory,
         bool default_stream,
         const std::vector<VideoCodecSettings>& recv_codecs);
     ~WebRtcVideoReceiveStream();
 
     const std::vector<uint32_t>& GetSsrcs() const;
 
     void SetLocalSsrc(uint32_t local_ssrc);
-    void SetNackAndRemb(bool nack_enabled, bool remb_enabled);
+    void SetFeedbackParameters(bool nack_enabled,
+                               bool remb_enabled,
+                               bool transport_cc_enabled);
     void SetRecvCodecs(const std::vector<VideoCodecSettings>& recv_codecs);
     void SetRtpExtensions(const std::vector<webrtc::RtpExtension>& extensions);
 
     void RenderFrame(const webrtc::VideoFrame& frame,
                      int time_to_render_ms) override;
     bool IsTextureSupported() const override;
     bool IsDefaultStream() const;
 
     void SetRenderer(cricket::VideoRenderer* renderer);
     cricket::VideoRenderer* GetRenderer();
@@ skipping 104 matching lines @@
   WebRtcVideoDecoderFactory* const external_decoder_factory_;
   std::vector<VideoCodecSettings> recv_codecs_;
   std::vector<webrtc::RtpExtension> recv_rtp_extensions_;
   webrtc::Call::Config::BitrateConfig bitrate_config_;
   VideoOptions options_;
 };
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_WEBRTC_WEBRTCVIDEOENGINE2_H_