Wire up RTCP XR target bitrate in rtp/rtcp module

webrtc/modules/rtp_rtcp/include/rtp_rtcp.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
index bb9e1f2959878b77886e45652e2e0c6eafd60b72..b0f50755ddc93085ae94381afe4790308c1842a2 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
@@ -424,6 +424,8 @@ class RtpRtcp : public Module {
   // BWE feedback packets.
   virtual bool SendFeedbackPacket(const rtcp::TransportFeedback& packet) = 0;
 
+  virtual void SetVideoBitrateAllocation(const BitrateAllocation& bitrate) = 0;
+
   // **************************************************************************
   // Audio
   // **************************************************************************