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 39fff5f64819d1014f5ac91cb00505a9c9a4d17c..d34b05f8e9973209d7c6d7eaf1925bac2564504b 100644
--- a/webrtc/p2p/base/port.cc
+++ b/webrtc/p2p/base/port.cc
@@ -310,6 +310,10 @@ 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) {