Add RemoteEstimatorProxy for capturing receive times

webrtc/modules/pacing/packet_router.cc

Index: webrtc/modules/pacing/packet_router.cc
diff --git a/webrtc/modules/pacing/packet_router.cc b/webrtc/modules/pacing/packet_router.cc
index 1b124981a1c5928240339095c4b602c92d89a045..ac11903dd65f0617a7ee5a4efda93921a56fa691 100644
--- a/webrtc/modules/pacing/packet_router.cc
+++ b/webrtc/modules/pacing/packet_router.cc
@@ -14,6 +14,7 @@
 #include "webrtc/base/checks.h"
 #include "webrtc/modules/rtp_rtcp/interface/rtp_rtcp.h"
 #include "webrtc/modules/rtp_rtcp/interface/rtp_rtcp_defines.h"
+#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.h"
 
 namespace webrtc {
 
@@ -89,4 +90,14 @@ uint16_t PacketRouter::AllocateSequenceNumber() {
   return new_seq;
 }
 
+bool PacketRouter::SendFeedback(rtcp::TransportFeedback* packet) {
+  rtc::CritScope cs(&modules_lock_);
+  for (auto* rtp_module : rtp_modules_) {
+    packet->WithPacketSenderSsrc(rtp_module->SSRC());
+    if (rtp_module->SendFeedbackPacket(*packet))
+      return true;
+  }
+  return false;
+}
+
 }  // namespace webrtc