Wire up rtcp xr target bitrate on receive side.

webrtc/modules/rtp_rtcp/source/rtcp_sender.cc

Index: webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_sender.cc b/webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
index c47e0604543ae0749cf285aaef064fc98142281e..45face4def565b9c43570b6e86165ce8c135ccf9 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
@@ -964,6 +964,7 @@ int32_t RTCPSender::SetApplicationSpecificData(uint8_t subType,
   return 0;
 }
 
+// TODO(sprang): Remove support for VoIP metrics? (Not supported in receiver.)

[danilchap, 2016/12/02 11:01:14]

Probably better reason: 'not used'.
(e.g. there is an rtcp message we support in receiver but not in sender. In case
other implementation of webrtc sends it.)

[sprang_webrtc, 2016/12/02 12:20:11]

Done.

 int32_t RTCPSender::SetRTCPVoIPMetrics(const RTCPVoIPMetric* VoIPMetric) {
   rtc::CritScope lock(&critical_section_rtcp_sender_);
   xr_voip_metric_.emplace(*VoIPMetric);