Wire up transport sequence number / send time callbacks to webrtc via libjingle.

webrtc/p2p/base/stunport.cc

Index: webrtc/p2p/base/stunport.cc
diff --git a/webrtc/p2p/base/stunport.cc b/webrtc/p2p/base/stunport.cc
index 615bbfe55a0b1859d6218df12603609020dcf0f8..1598fe43cea80a91c98b897cf48cb19c07ef2638 100644
--- a/webrtc/p2p/base/stunport.cc
+++ b/webrtc/p2p/base/stunport.cc
@@ -217,6 +217,7 @@ bool UDPPort::Init() {
     }
     socket_->SignalReadPacket.connect(this, &UDPPort::OnReadPacket);
   }
+  socket_->SignalSentPacket.connect(this, &UDPPort::OnSentPacket);
   socket_->SignalReadyToSend.connect(this, &UDPPort::OnReadyToSend);
   socket_->SignalAddressReady.connect(this, &UDPPort::OnLocalAddressReady);
   requests_.SignalSendPacket.connect(this, &UDPPort::OnSendPacket);
@@ -329,6 +330,11 @@ void UDPPort::OnReadPacket(
   }
 }
 
+void UDPPort::OnSentPacket(rtc::AsyncPacketSocket* socket,
+                           const rtc::SentPacket& sent_packet) {
+  Port::OnSentPacket(sent_packet);
+}
+
 void UDPPort::OnReadyToSend(rtc::AsyncPacketSocket* socket) {
   Port::OnReadyToSend();
 }