Set actual transport overhead in rtp_rtcp

webrtc/call.h

Index: webrtc/call.h
diff --git a/webrtc/call.h b/webrtc/call.h
index 9855b600f050ebd64cd02a5639869c0b59c4e38e..eba47a4a2553f140ce1b10837f7ec703c510ee05 100644
--- a/webrtc/call.h
+++ b/webrtc/call.h
@@ -154,6 +154,10 @@ class Call {
   virtual void SignalChannelNetworkState(MediaType media,
                                          NetworkState state) = 0;
 
+  virtual void SignalTransportOverheadChange(
+      MediaType media,
+      int transport_overhead_per_packet) = 0;
+
   virtual void OnNetworkRouteChanged(
       const std::string& transport_name,
       const rtc::NetworkRoute& network_route) = 0;