Set actual transport overhead in rtp_rtcp

webrtc/audio/audio_send_stream.h

Index: webrtc/audio/audio_send_stream.h
diff --git a/webrtc/audio/audio_send_stream.h b/webrtc/audio/audio_send_stream.h
index 5a2864b77fcbba116cd81691ab020c4f6a3e1252..58042851754881a2dc0316695543a9733df4367e 100644
--- a/webrtc/audio/audio_send_stream.h
+++ b/webrtc/audio/audio_send_stream.h
@@ -57,6 +57,7 @@ class AudioSendStream final : public webrtc::AudioSendStream,
                             int64_t rtt) override;
 
   const webrtc::AudioSendStream::Config& config() const;
+  void SetTransportOverhead(int transport_overhead_per_packet_byte);
 
  private:
   VoiceEngine* voice_engine() const;