This is the first pass at making GetIPConfigs asynchronous.

chrome/browser/chromeos/cros/network_library_impl_cros.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_CROS_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_IMPL_CROS_H_
 
 #include "chrome/browser/chromeos/cros/network_library_impl_base.h"
 
 namespace chromeos {
@@ skipping 53 matching lines @@
 
   virtual void RefreshIPConfig(Network* network) OVERRIDE;
 
   virtual void DisconnectFromNetwork(const Network* network) OVERRIDE;
   virtual void CallEnableNetworkDeviceType(
       ConnectionType device, bool enable) OVERRIDE;
   virtual void CallRemoveNetwork(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;
 
   //////////////////////////////////////////////////////////////////////////////
   // Callbacks.
   void UpdateNetworkStatus(
       const std::string& path, const std::string& key, const Value& value);
 
   void UpdateNetworkDeviceStatus(
       const std::string& path, const std::string& key, const Value& value);
   // Cellular specific updates. Returns false if update was ignored / reverted
   // and notification should be skipped.
   bool UpdateCellularDeviceStatus(NetworkDevice* device, PropertyIndex index);
 
+  void GetIPConfigsCallback(const NetworkGetIPConfigsCallback& callback,
+                            HardwareAddressFormat format,
+                            const NetworkIPConfigVector& ipconfig_vector,
+                            const std::string& hardware_address);
+
   void PinOperationCallback(const std::string& path,
                             NetworkMethodErrorType error,
                             const std::string& error_message);
 
   void CellularRegisterCallback(const std::string& path,
                                 NetworkMethodErrorType error,
                                 const std::string& error_message);
 
   void NetworkConnectCallback(const std::string& service_path,
                               NetworkMethodErrorType error,
@@ skipping 86 matching lines @@
 
   // Map of monitored devices.
   NetworkWatcherMap monitored_devices_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkLibraryImplCros);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_NETWORK_LIBRARY_IMPL_CROS_H_