Reset the BWE when the network changes

webrtc/p2p/quic/quictransportchannel.cc

Index: webrtc/p2p/quic/quictransportchannel.cc
diff --git a/webrtc/p2p/quic/quictransportchannel.cc b/webrtc/p2p/quic/quictransportchannel.cc
index eae936ba53fa7fe3587a1f43a0251d2106158bcf..aa15fcb7b6aec146f322c4754b0572ed01f90bd9 100644
--- a/webrtc/p2p/quic/quictransportchannel.cc
+++ b/webrtc/p2p/quic/quictransportchannel.cc
@@ -139,6 +139,8 @@ QuicTransportChannel::QuicTransportChannel(TransportChannelImpl* channel)
                                        &QuicTransportChannel::OnRoleConflict);
   channel_->SignalRouteChange.connect(this,
                                       &QuicTransportChannel::OnRouteChange);
+  channel_->SignalBestConnectionChanged.connect(
+      this, &QuicTransportChannel::OnBestConnectionChanged);
   channel_->SignalConnectionRemoved.connect(
       this, &QuicTransportChannel::OnConnectionRemoved);
   channel_->SignalReceivingState.connect(
@@ -382,6 +384,13 @@ void QuicTransportChannel::OnRouteChange(TransportChannel* channel,
   SignalRouteChange(this, candidate);
 }
 
+void QuicTransportChannel::OnBestConnectionChanged(
+    TransportChannel* channel,
+    Connection* best_connection) {
+  ASSERT(channel == channel_);
+  SignalBestConnectionChanged(this, best_connection);
+}
+
 void QuicTransportChannel::OnConnectionRemoved(TransportChannelImpl* channel) {
   ASSERT(channel == channel_);
   SignalConnectionRemoved(this);