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

webrtc/p2p/base/port.h

Index: webrtc/p2p/base/port.h
diff --git a/webrtc/p2p/base/port.h b/webrtc/p2p/base/port.h
index c6b7f609aad7500e6ad7d0b68676e2a59c072d5a..ab3d3ff117ce5046fa9e17c7262045db4f5c03ac 100644
--- a/webrtc/p2p/base/port.h
+++ b/webrtc/p2p/base/port.h
@@ -275,6 +275,9 @@ class Port : public PortInterface, public rtc::MessageHandler,
                             IceMessage* stun_msg,
                             const std::string& remote_ufrag);
 
+  // Called when a packet has been sent to the socket.
+  void OnSentPacket(const rtc::SentPacket& sent_packet);
+
   // Called when the socket is currently able to send.
   void OnReadyToSend();