Update the type and cost of existing networks if its type is found later by network monitor

webrtc/p2p/base/portinterface.h

Index: webrtc/p2p/base/portinterface.h
diff --git a/webrtc/p2p/base/portinterface.h b/webrtc/p2p/base/portinterface.h
index e73861965e538e0ab8e09907d56b63241547c4b7..8ac4c96ddb68124991faa48b24a9557727bbf446 100644
--- a/webrtc/p2p/base/portinterface.h
+++ b/webrtc/p2p/base/portinterface.h
@@ -107,6 +107,10 @@ class PortInterface {
   // Signaled when the network used by this port becomes inactive.
   sigslot::signal1<PortInterface*> SignalNetworkInactive;
 
+  // Signaled when the network cost of the port changes and the port has created
+  // any connections.
+  sigslot::signal1<PortInterface*> SignalNetworkCostChanged;
+
   // Signaled when Port discovers ice role conflict with the peer.
   sigslot::signal1<PortInterface*> SignalRoleConflict;