Add RemoteEstimatorProxy for capturing receive times

webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h

Index: webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h b/webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h
index 6e51fb88b605e8353d9503b3bc02c6c92db635cc..54a2488aaa7fb98421bddaad3b89fb630c9007ae 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h
@@ -53,6 +53,8 @@ class TransportFeedback : public RtcpPacket {
   // is relative the base time.
   std::vector<int64_t> GetReceiveDeltasUs() const;
 
+  uint32_t GetPacketSenderSsrc() const;
+  uint32_t GetMediaSourceSsrc() const;
   static const int kDeltaScaleFactor = 250;  // Convert to multiples of 0.25ms.
   static const uint8_t kFeedbackMessageType = 15;  // TODO(sprang): IANA reg?
   static const uint8_t kPayloadType = 205;         // RTPFB, see RFC4585.