Wire up BitrateAllocation to be sent as RTCP TargetBitrate

webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
index 9ba9b51bbb10469a0e190a77e9506579a2960802..1b895d0a21deea1f98168b6d7556b00afe40c4da 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
@@ -102,6 +102,10 @@ enum RTCPPacketType : uint32_t {
   kRtcpXrReceiverReferenceTime = 0x40000,
   kRtcpXrDlrrReportBlock = 0x80000,
   kRtcpTransportFeedback = 0x100000,
+  kRtcpXrTargetBitrate = 0x200000,
+  kRtcpAnyExtendedReports = kRtcpXrVoipMetric | kRtcpXrReceiverReferenceTime |
+                            kRtcpXrDlrrReportBlock |
+                            kRtcpXrTargetBitrate

[stefan-webrtc, 2016/12/01 08:42:20]

This looks a bit odd. Should this really belong to RTCPPacketType?

[sprang_webrtc, 2016/12/01 10:47:58]

The problem is in rtcp sender, it becomes either rather complicated or we'll
have to change the type in a number of places from enum to uint32_t... I would
have liked to rather go the other way (to an enum class) in the not too distant
future. 

I'll change to an uint32_t for now and remove this. Let's keep the  refactorings
to separate cls.

 };
 
 enum KeyFrameRequestMethod { kKeyFrameReqPliRtcp, kKeyFrameReqFirRtcp };