Add the last_sent_packet_id to the candidate pair change signal

webrtc/pc/channel.h

 /*
  *  Copyright 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 191 matching lines @@
                              const char* data,
                              size_t len,
                              const rtc::PacketTime& packet_time,
                              int flags);
   void OnReadyToSend(TransportChannel* channel);
 
   void OnDtlsState(TransportChannel* channel, DtlsTransportState state);
 
   void OnSelectedCandidatePairChanged(
       TransportChannel* channel,
-      CandidatePairInterface* selected_candidate_pair);
+      CandidatePairInterface* selected_candidate_pair,
+      int last_sent_packet_id);
 
   bool PacketIsRtcp(const TransportChannel* channel, const char* data,
                     size_t len);
   bool SendPacket(bool rtcp,
                   rtc::CopyOnWriteBuffer* packet,
                   const rtc::PacketOptions& options);
   virtual bool WantsPacket(bool rtcp, const rtc::CopyOnWriteBuffer* packet);
   void HandlePacket(bool rtcp, rtc::CopyOnWriteBuffer* packet,
                     const rtc::PacketTime& packet_time);
 
@@ skipping 387 matching lines @@
   // SetSendParameters.
   DataSendParameters last_send_params_;
   // Last DataRecvParameters sent down to the media_channel() via
   // SetRecvParameters.
   DataRecvParameters last_recv_params_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_PC_CHANNEL_H_