Add the last_sent_packet_id to the candidate pair change signal

webrtc/pc/channel.cc

Index: webrtc/pc/channel.cc
diff --git a/webrtc/pc/channel.cc b/webrtc/pc/channel.cc
index 25ba2c0586ccf1020e0ad4bf03743e28721c9f4d..b76d7bdb1d2d4e72314b23c98ff4171f855e9672 100644
--- a/webrtc/pc/channel.cc
+++ b/webrtc/pc/channel.cc
@@ -509,13 +509,15 @@ void BaseChannel::OnDtlsState(TransportChannel* channel,
 
 void BaseChannel::OnSelectedCandidatePairChanged(
     TransportChannel* channel,
-    CandidatePairInterface* selected_candidate_pair) {
+    CandidatePairInterface* selected_candidate_pair,
+    int last_sent_packet_id) {
   ASSERT(channel == transport_channel_ || channel == rtcp_transport_channel_);
   NetworkRoute network_route;
   if (selected_candidate_pair) {
     network_route =
         NetworkRoute(selected_candidate_pair->local_candidate().network_id(),
-                     selected_candidate_pair->remote_candidate().network_id());
+                     selected_candidate_pair->remote_candidate().network_id(),
+                     last_sent_packet_id);
   }
   media_channel()->OnNetworkRouteChanged(channel->transport_name(),
                                          network_route);