This adds Cros API for calling the "Refresh" function on shill's

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 260 matching lines @@
                        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);
+
 // Reads out the results of the last wifi scan. These results are not
 // pre-cached in the library, so the call may block whilst the results are
 // read over IPC.
 // Returns false if an error occurred in reading the results. Note that
 // a true return code only indicates the result set was successfully read,
 // it does not imply a scan has successfully completed yet.
 bool CrosGetWifiAccessPoints(WifiAccessPointVector* result);
 
 // Configures the network service specified by |properties|.
 void CrosConfigureService(const base::DictionaryValue& properties);
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_CROS_NETWORK_FUNCTIONS_H_