Reset the BWE when the network changes

webrtc/p2p/base/dtlstransportchannel.cc

Index: webrtc/p2p/base/dtlstransportchannel.cc
diff --git a/webrtc/p2p/base/dtlstransportchannel.cc b/webrtc/p2p/base/dtlstransportchannel.cc
index bbf3e5c484b0302672ea889665ec4ec0ac285134..e0f203351e8402bd608a6290408509bf92894d7c 100644
--- a/webrtc/p2p/base/dtlstransportchannel.cc
+++ b/webrtc/p2p/base/dtlstransportchannel.cc
@@ -119,6 +119,8 @@ DtlsTransportChannelWrapper::DtlsTransportChannelWrapper(
       &DtlsTransportChannelWrapper::OnRoleConflict);
   channel_->SignalRouteChange.connect(this,
       &DtlsTransportChannelWrapper::OnRouteChange);
+  channel_->SignalNetworkChanged.connect(
+      this, &DtlsTransportChannelWrapper::OnNetworkChanged);
   channel_->SignalConnectionRemoved.connect(this,
       &DtlsTransportChannelWrapper::OnConnectionRemoved);
   channel_->SignalReceivingState.connect(this,
@@ -634,6 +636,13 @@ void DtlsTransportChannelWrapper::OnRouteChange(
   SignalRouteChange(this, candidate);
 }
 
+void DtlsTransportChannelWrapper::OnNetworkChanged(TransportChannel* channel,
+                                                   int local_network_id,
+                                                   int remote_network_id) {
+  ASSERT(channel == channel_);
+  SignalNetworkChanged(this, local_network_id, remote_network_id);
+}
+
 void DtlsTransportChannelWrapper::OnConnectionRemoved(
     TransportChannelImpl* channel) {
   ASSERT(channel == channel_);