Adding "first packet received" notification to PeerConnectionObserver.

talk/app/webrtc/peerconnectioninterface.h

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 483 matching lines @@
   // New Ice candidate have been found.
   virtual void OnIceCandidate(const IceCandidateInterface* candidate) = 0;
 
   // TODO(bemasc): Remove this once callers transition to OnIceGatheringChange.
   // All Ice candidates have been found.
   virtual void OnIceComplete() {}
 
   // Called when the ICE connection receiving status changes.
   virtual void OnIceConnectionReceivingChange(bool receiving) {}
 
+  // Called when the first RTP packet is received.
+  virtual void OnFirstMediaPacketReceived() {}
+
  protected:
   // Dtor protected as objects shouldn't be deleted via this interface.
   ~PeerConnectionObserver() {}
 };
 
 // PeerConnectionFactoryInterface is the factory interface use for creating
 // PeerConnection, MediaStream and media tracks.
 // PeerConnectionFactoryInterface will create required libjingle threads,
 // socket and network manager factory classes for networking.
 // If an application decides to provide its own threads and network
@@ skipping 107 matching lines @@
 CreatePeerConnectionFactory(
     rtc::Thread* worker_thread,
     rtc::Thread* signaling_thread,
     AudioDeviceModule* default_adm,
     cricket::WebRtcVideoEncoderFactory* encoder_factory,
     cricket::WebRtcVideoDecoderFactory* decoder_factory);
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_PEERCONNECTIONINTERFACE_H_