This is the first pass at making GetIPConfigs asynchronous.

chrome/browser/chromeos/cros/network_library_impl_stub.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_CROS_NETWORK_LIBRARY_IMPL_STUB_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_IMPL_STUB_H_
 
 #include "chrome/browser/chromeos/cros/network_library_impl_base.h"
 
 namespace chromeos {
@@ skipping 57 matching lines @@
   virtual void RequestNetworkScan() OVERRIDE;
 
   virtual bool GetWifiAccessPoints(WifiAccessPointVector* result) OVERRIDE;
 
   virtual void RefreshIPConfig(Network* network) OVERRIDE;
 
   virtual void DisconnectFromNetwork(const Network* network) OVERRIDE;
 
   virtual void EnableOfflineMode(bool enable) OVERRIDE;
 
-  virtual NetworkIPConfigVector GetIPConfigs(
+  virtual void GetIPConfigs(
+      const std::string& device_path,
+      HardwareAddressFormat format,
+      const NetworkGetIPConfigsCallback& callback) OVERRIDE;
+  virtual NetworkIPConfigVector GetIPConfigsAndBlock(
       const std::string& device_path,
       std::string* hardware_address,
       HardwareAddressFormat format) OVERRIDE;
   virtual void SetIPParameters(const std::string& service_path,
                                const std::string& address,
                                const std::string& netmask,
                                const std::string& gateway,
                                const std::string& name_servers,
                                int dhcp_usage_mask) OVERRIDE;
 
@@ skipping 13 matching lines @@
   WifiNetworkVector disabled_wifi_networks_;
   CellularNetworkVector disabled_cellular_networks_;
   WimaxNetworkVector disabled_wimax_networks_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkLibraryImplStub);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_IMPL_STUB_H_