Add pref entry for virtual keyboard

chrome/browser/chromeos/input_method/input_method_manager.cc

Index: chrome/browser/chromeos/input_method/input_method_manager.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_manager.cc b/chrome/browser/chromeos/input_method/input_method_manager.cc
index f84fb9aa3eafc61c06c7301f8a6c3f887b6bb88f..e33ce29f0961142a40ce985e6fdb52ebb4cfb90c 100644
--- a/chrome/browser/chromeos/input_method/input_method_manager.cc
+++ b/chrome/browser/chromeos/input_method/input_method_manager.cc
@@ -297,6 +297,16 @@ class InputMethodManagerImpl : public InputMethodManager,
                                                   is_system);
   }
 
+  virtual bool SetVirtualKeyboardPreference(const std::string& input_method_id,
+                                            const GURL& extention_url) {
+    return virtual_keyboard_selector_.SetUserPreference(
+        input_method_id, extention_url);
+  }
+
+  virtual void ClearVirtualKeyboardPreference() {
+    return virtual_keyboard_selector_.ClearUserPreference();
+  }
+
   static InputMethodManagerImpl* GetInstance() {
     return Singleton<InputMethodManagerImpl,
         DefaultSingletonTraits<InputMethodManagerImpl> >::get();