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

webrtc/p2p/base/port.cc

Index: webrtc/p2p/base/port.cc
diff --git a/webrtc/p2p/base/port.cc b/webrtc/p2p/base/port.cc
index ce2855106caa8c9384271f3b1687c343061a5ce9..34f2aec56b31c161e1cb4279f822b3e419ed64f2 100644
--- a/webrtc/p2p/base/port.cc
+++ b/webrtc/p2p/base/port.cc
@@ -312,6 +312,10 @@ void Port::OnReadPacket(
   }
 }
 
+void Port::OnSentPacket(const rtc::SentPacket& sent_packet) {
+  PortInterface::SignalSentPacket(this, sent_packet);
+}
+
 void Port::OnReadyToSend() {
   AddressMap::iterator iter = connections_.begin();
   for (; iter != connections_.end(); ++iter) {