This is the first pass at making GetIPConfigs asynchronous.

chrome/browser/chromeos/net/network_change_notifier_chromeos.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 CHROME_BROWSER_CHROMEOS_NET_NETWORK_CHANGE_NOTIFIER_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_NET_NETWORK_CHANGE_NOTIFIER_CHROMEOS_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 43 matching lines @@
   virtual void OnNetworkChanged(chromeos::NetworkLibrary* cros,
                                 const chromeos::Network* network) OVERRIDE;
 
   // Initiate online status change reporting.
   void ReportConnectionChange();
   void ReportConnectionChangeOnUIThread();
   // Callback from online_notification_task_ when online state notification
   // is actually scheduled.
   void OnOnlineStateNotificationFired();
 
-  // Updates data members that keep the track the network stack state.
+  // Initiates an update of data members that keep the track the network stack
+  // state.
   void UpdateNetworkState(chromeos::NetworkLibrary* cros);
+  // Called when a network state update has completed. Updates data members that
+  // keep the track the network stack state.
+  void UpdateNetworkStateCallback(chromeos::NetworkLibrary* cros,
+                                  const NetworkIPConfigVector& ip_configs,
+                                  const std::string& hardware_address);
   // Updates network connectivity state.
   void UpdateConnectivityState(const chromeos::Network* network);
 
   // Updates the initial state. Lets us trigger initial eval of the
   // connectivity status without waiting for an event from the connection
   // manager.
   static void UpdateInitialState(NetworkChangeNotifierChromeos* self);
 
   // Gets connection type for given |network|.
   static net::NetworkChangeNotifier::ConnectionType GetNetworkConnectionType(
@@ skipping 13 matching lines @@
   scoped_ptr<DnsConfigServiceChromeos> dns_config_service_;
 
   base::WeakPtrFactory<NetworkChangeNotifierChromeos> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NET_NETWORK_CHANGE_NOTIFIER_CHROMEOS_H_