Reset the BWE when the network changes

webrtc/p2p/base/transportchannel.h

Index: webrtc/p2p/base/transportchannel.h
diff --git a/webrtc/p2p/base/transportchannel.h b/webrtc/p2p/base/transportchannel.h
index b91af139b7155d35589305deef52cb0bb7308eb5..c09d8d8a0af1dcfe6e6c008bb7d59a7ad4a62527 100644
--- a/webrtc/p2p/base/transportchannel.h
+++ b/webrtc/p2p/base/transportchannel.h
@@ -151,6 +151,12 @@ class TransportChannel : public sigslot::has_slots<> {
   // indicates where and how we are currently sending media.
   sigslot::signal2<TransportChannel*, const Candidate&> SignalRouteChange;
 
+  // This signals the network has changed on either end of the connection.
+  // The first parameter is the transport channel that signaled the event.
+  // The second parameter is the local network id of the connection.
+  // The third parameter is the remote network id of the connection.
+  sigslot::signal3<TransportChannel*, int, int> SignalNetworkChanged;
+
   // Invoked when the channel is being destroyed.
   sigslot::signal1<TransportChannel*> SignalDestroyed;