Add the last_sent_packet_id to the candidate pair change signal

webrtc/p2p/quic/quictransportchannel.h

 /*
  *  Copyright 2016 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 214 matching lines @@
   void OnSentPacket(TransportChannel* channel,
                     const rtc::SentPacket& sent_packet);
   void OnReadyToSend(TransportChannel* channel);
   void OnReceivingState(TransportChannel* channel);
   void OnGatheringState(TransportChannelImpl* channel);
   void OnCandidateGathered(TransportChannelImpl* channel, const Candidate& c);
   void OnRoleConflict(TransportChannelImpl* channel);
   void OnRouteChange(TransportChannel* channel, const Candidate& candidate);
   void OnSelectedCandidatePairChanged(
       TransportChannel* channel,
-      CandidatePairInterface* selected_candidate_pair);
+      CandidatePairInterface* selected_candidate_pair,
+      int last_sent_packet_id);
   void OnConnectionRemoved(TransportChannelImpl* channel);
 
   // Callbacks for |quic_|.
   // Called when |quic_| has established the crypto handshake.
   void OnHandshakeComplete();
   // Called when |quic_| has closed the connection.
   void OnConnectionClosed(net::QuicErrorCode error, bool from_peer);
 
   // Called by OnReadPacket() when a QUIC packet is received.
   bool HandleQuicPacket(const char* data, size_t size);
@@ skipping 33 matching lines @@
   rtc::scoped_refptr<rtc::RTCCertificate> local_certificate_;
   // Fingerprint of the remote peer. This must be set before we start QUIC.
   rtc::Optional<RemoteFingerprint> remote_fingerprint_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(QuicTransportChannel);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_QUIC_QUICTRANSPORTCHANNEL_H_