Reset the BWE when the network changes

webrtc/p2p/base/p2ptransportchannel.cc

 /*
  *  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 1147 matching lines @@
     if (old_best_connection) {
       LOG_J(LS_INFO, this) << "Previous best connection: "
                            << old_best_connection->ToString();
     }
     LOG_J(LS_INFO, this) << "New best connection: "
                          << best_connection_->ToString();
     SignalRouteChange(this, best_connection_->remote_candidate());
   } else {
     LOG_J(LS_INFO, this) << "No best connection";
   }
+  SignalBestConnectionChanged(this, best_connection_);

[pthatcher1, 2016/03/24 18:46:37]

It would be nice to call this selected_connection_ or even
selected_candidate_pair_.  Could you at least put a TODO?

[honghaiz3, 2016/03/24 22:37:12]

I added a TODO here, will make that change in a separate CL. 

 }
 
 // Warning: UpdateState should eventually be called whenever a connection
 // is added, deleted, or the write state of any connection changes so that the
 // transport controller will get the up-to-date channel state. However it
 // should not be called too often; in the case that multiple connection states
 // change, it should be called after all the connection states have changed. For
 // example, we call this at the end of SortConnections.
 void P2PTransportChannel::UpdateState() {
   state_ = ComputeState();
@@ skipping 441 matching lines @@
 
   // During the initial state when nothing has been pinged yet, return the first
   // one in the ordered |connections_|.
   return *(std::find_if(connections_.begin(), connections_.end(),
                         [conn1, conn2](Connection* conn) {
                           return conn == conn1 || conn == conn2;
                         }));
 }
 
 }  // namespace cricket