Add support for negotiating RTCP with reduced size.

talk/media/webrtc/webrtcvideoengine2.h

Index: talk/media/webrtc/webrtcvideoengine2.h
diff --git a/talk/media/webrtc/webrtcvideoengine2.h b/talk/media/webrtc/webrtcvideoengine2.h
index 2b90953459fb849387925243ca4292ff94c579a0..50e8bde802b7e4a2db48b1be561c2c5e2dccf0d4 100644
--- a/talk/media/webrtc/webrtcvideoengine2.h
+++ b/talk/media/webrtc/webrtcvideoengine2.h
@@ -273,7 +273,8 @@ class WebRtcVideoChannel2 : public rtc::MessageHandler,
         int max_bitrate_bps,
         const Settable<VideoCodecSettings>& codec_settings,
         const StreamParams& sp,
-        const std::vector<webrtc::RtpExtension>& rtp_extensions);
+        const std::vector<webrtc::RtpExtension>& rtp_extensions,
+        const VideoSendParameters& send_params);
     ~WebRtcVideoSendStream();
 
     void SetOptions(const VideoOptions& options);
@@ -542,6 +543,10 @@ class WebRtcVideoChannel2 : public rtc::MessageHandler,
   std::vector<webrtc::RtpExtension> recv_rtp_extensions_;
   webrtc::Call::Config::BitrateConfig bitrate_config_;
   VideoOptions options_;
+  // TODO(pbos): Don't duplicate information between
+  // send_params/recv_params, rtp_extensions, options, etc.
+  VideoSendParameters send_params_;
+  VideoRecvParameters recv_params_;
 };
 
 }  // namespace cricket