Add RemoteEstimatorProxy for capturing receive times

webrtc/modules/rtp_rtcp/source/rtcp_sender.h

Index: webrtc/modules/rtp_rtcp/source/rtcp_sender.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_sender.h b/webrtc/modules/rtp_rtcp/source/rtcp_sender.h
index 67d58aa8b8c7dfab9c5138ee85d9576313b4c5cf..083ce781aecf980dfd0876baf4f54cc9e82b91b6 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_sender.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_sender.h
@@ -33,6 +33,9 @@ namespace webrtc {
 class ModuleRtpRtcpImpl;
 class RTCPReceiver;
 
+namespace rtcp {
+class TransportFeedback;
+}
 class NACKStringBuilder {
  public:
   NACKStringBuilder();
@@ -147,6 +150,7 @@ public:
  void SetCsrcs(const std::vector<uint32_t>& csrcs);
 
  void SetTargetBitrate(unsigned int target_bitrate);
+ bool SendFeedbackPacket(const rtcp::TransportFeedback& packet);
 
 private:
  struct RtcpContext;