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

webrtc/p2p/base/p2ptransportchannel.cc

Index: webrtc/p2p/base/p2ptransportchannel.cc
diff --git a/webrtc/p2p/base/p2ptransportchannel.cc b/webrtc/p2p/base/p2ptransportchannel.cc
index fc721312331233ad7db90f42164913fd5606bbb3..9d598f57f3d7902d7c12ac55f8eee22bbda80edc 100644
--- a/webrtc/p2p/base/p2ptransportchannel.cc
+++ b/webrtc/p2p/base/p2ptransportchannel.cc
@@ -435,6 +435,7 @@ void P2PTransportChannel::OnPortReady(PortAllocatorSession *session,
   port->SignalDestroyed.connect(this, &P2PTransportChannel::OnPortDestroyed);
   port->SignalRoleConflict.connect(
       this, &P2PTransportChannel::OnRoleConflict);
+  port->SignalSentPacket.connect(this, &P2PTransportChannel::OnSentPacket);
 
   // Attempt to create a connection from this new port to all of the remote
   // candidates that we were given so far.
@@ -1356,6 +1357,13 @@ void P2PTransportChannel::OnReadPacket(Connection* connection,
   }
 }
 
+void P2PTransportChannel::OnSentPacket(PortInterface* port,
+                                       const rtc::SentPacket& sent_packet) {
+  ASSERT(worker_thread_ == rtc::Thread::Current());
+
+  SignalSentPacket(this, sent_packet);
+}
+
 void P2PTransportChannel::OnReadyToSend(Connection* connection) {
   if (connection == best_connection_ && writable()) {
     SignalReadyToSend(this);