NetworkChangeNotifierChromeos: Handle IPConfig property changes on the default network

chromeos/network/network_state_handler_observer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_NETWORK_NETWORK_STATE_HANDLER_OBSERVER_H_
 #define CHROMEOS_NETWORK_NETWORK_STATE_HANDLER_OBSERVER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 15 matching lines @@
 
   // Called when one or more network manager properties changes.
   virtual void NetworkManagerChanged();
 
   // The list of networks changed.
   virtual void NetworkListChanged();
 
   // The list of devices changed, or a property changed (e.g. scanning).
   virtual void DeviceListChanged();
 
-  // The default network changed (includes VPNs) or its connection state
-  // changed. |network| will be NULL if there is no longer a default network.
+  // The default network changed (includes VPNs) or one of its properties
+  // changed. This won't be called if the WiFi signal strength property
+  // changes. If interested in those events, use NetworkPropertiesUpdated()
+  // below.
+  // |network| will be NULL if there is no longer a default network.
   virtual void DefaultNetworkChanged(const NetworkState* network);
 
   // The connection state of |network| changed.
   virtual void NetworkConnectionStateChanged(const NetworkState* network);
 
   // One or more properties of |network| have been updated. Note: this will get
   // called in *addition* to NetworkConnectionStateChanged() when the
   // connection state property changes. Use this to track properties like
   // wifi strength.
   virtual void NetworkPropertiesUpdated(const NetworkState* network);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NetworkStateHandlerObserver);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_NETWORK_NETWORK_STATE_HANDLER_OBSERVER_H_