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

chrome/browser/chromeos/cros/network_library.h

Index: chrome/browser/chromeos/cros/network_library.h
diff --git a/chrome/browser/chromeos/cros/network_library.h b/chrome/browser/chromeos/cros/network_library.h
index 7259660b8b7d0adbc8cf0a851694c9605da5d9a1..6c79b4bd58efb0d1a2d75b87000cadf525f0abec 100644
--- a/chrome/browser/chromeos/cros/network_library.h
+++ b/chrome/browser/chromeos/cros/network_library.h
@@ -1558,6 +1558,10 @@ class NetworkLibrary {
   // user input (e.g. it requires a user profile but none is available).
   virtual bool CanConnectToNetwork(const Network* network) const = 0;
 
+  // Refresh the IP configuration of the given network after changes.  Puts
+  // newly configured properties into effect and renews DHCP lease.
+  virtual void RefreshIPConfig(Network* network) = 0;
+
   // Connect to the specified wireless network.
   virtual void ConnectToWifiNetwork(WifiNetwork* network) = 0;