Allow to turn RtcpTransciever on and off at runtime.

Bug: webrtc:8239
Change-Id: I8678d1ee9cd0da194a1243d40b508bb62cb3f257
Reviewed-on: https://webrtc-review.googlesource.com/60180
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22311}
diff --git a/modules/rtp_rtcp/source/rtcp_transceiver_impl.h b/modules/rtp_rtcp/source/rtcp_transceiver_impl.h
index abbc40f..05c74f2 100644
--- a/modules/rtp_rtcp/source/rtcp_transceiver_impl.h
+++ b/modules/rtp_rtcp/source/rtcp_transceiver_impl.h
@@ -43,6 +43,8 @@
   void RemoveMediaReceiverRtcpObserver(uint32_t remote_ssrc,
                                        MediaReceiverRtcpObserver* observer);
 
+  void SetReadyToSend(bool ready);
+
   void ReceivePacket(rtc::ArrayView<const uint8_t> packet, int64_t now_us);
 
   void SendCompoundPacket();
@@ -88,6 +90,7 @@
 
   const RtcpTransceiverConfig config_;
 
+  bool ready_to_send_;
   rtc::Optional<rtcp::Remb> remb_;
   // TODO(danilchap): Remove entries from remote_senders_ that are no longer
   // needed.