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

chromeos/dbus/flimflam_ipconfig_client.h

Index: chromeos/dbus/flimflam_ipconfig_client.h
diff --git a/chromeos/dbus/flimflam_ipconfig_client.h b/chromeos/dbus/flimflam_ipconfig_client.h
index 19e9a980a40a20caf6492aa463d757bb75ae888f..e3686fa7728894f881ef14ae5e840458b77498b2 100644
--- a/chromeos/dbus/flimflam_ipconfig_client.h
+++ b/chromeos/dbus/flimflam_ipconfig_client.h
@@ -52,6 +52,11 @@ class CHROMEOS_EXPORT FlimflamIPConfigClient {
   virtual void ResetPropertyChangedHandler(
       const dbus::ObjectPath& ipconfig_path) = 0;
 
+  // Refreshes the active IP configuration after service property changes and
+  // renews the DHCP lease, if any.
+  virtual void Refresh(const dbus::ObjectPath& ipconfig_path,
+                       const VoidDBusMethodCallback& callback) = 0;
+
   // Calls GetProperties method.
   // |callback| is called after the method call succeeds.
   virtual void GetProperties(const dbus::ObjectPath& ipconfig_path,