This is the first pass at making GetIPConfigs asynchronous.

chrome/browser/chromeos/cros/cros_network_functions.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_CROS_NETWORK_FUNCTIONS_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_CROS_NETWORK_FUNCTIONS_H_
 
 // This header is introduced to make it easy to switch from chromeos_network.cc
 // to Chrome's own DBus code.  crosbug.com/16557
 // All calls to functions in chromeos_network.h should be made through
@@ skipping 245 matching lines @@
 // automatic registration mode before initiating registration.
 void CrosRequestCellularRegister(const std::string& device_path,
                                  const std::string& network_id,
                                  const NetworkOperationCallback& callback);
 
 // Enables or disables the specific network device for connection.
 // Set offline mode. This will turn off all radios.
 // Returns false on failure and true on success.
 bool CrosSetOfflineMode(bool offline);
 
+// Gets a list of all the NetworkIPConfigs using a given device path,
+// and returns the information via callback.
+void CrosListIPConfigs(const std::string& device_path,
+                       const NetworkGetIPConfigsCallback& callback);
+
+// DEPRECATED, DO NOT USE: Use the asynchronous CrosListIPConfigs, above,
+// instead.
 // Gets a list of all the NetworkIPConfigs using a given device path.
-// Optionally, you can get ipconfig-paths and the hardware address.
-// Pass NULL as |ipconfig_paths| and |hardware_address| if you are not
-// interested in these values.
-bool CrosListIPConfigs(const std::string& device_path,
-                       NetworkIPConfigVector* ipconfig_vector,
-                       std::vector<std::string>* ipconfig_paths,
-                       std::string* hardware_address);
+// Optionally, you can get ipconfig-paths and the hardware address. Pass NULL as
+// |ipconfig_paths| and |hardware_address| if you are not interested in these
+// values.
+bool CrosListIPConfigsAndBlock(const std::string& device_path,
+                               NetworkIPConfigVector* ipconfig_vector,
+                               std::vector<std::string>* ipconfig_paths,
+                               std::string* hardware_address);
 
 // Adds a IPConfig of the given type to the device
 bool CrosAddIPConfig(const std::string& device_path, IPConfigType type);
 
 // Removes an existing IP Config
 bool CrosRemoveIPConfig(const std::string& ipconfig_path);
 
 // Refreshes the IP config |ipconfig_path| to pick up changes in
 // configuration, and renew the DHCP lease, if any.
 void CrosRequestIPConfigRefresh(const std::string& ipconfig_path);
@@ skipping 19 matching lines @@
 int32 CrosNetmaskToPrefixLength(const std::string& netmask);
 
 // Changes the active cellular carrier.
 void CrosSetCarrier(const std::string& device_path,
                     const std::string& carrier,
                     const NetworkOperationCallback& callback);
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_CROS_NETWORK_FUNCTIONS_H_