Add pref entry for virtual keyboard

chrome/browser/chromeos/preferences.h

Index: chrome/browser/chromeos/preferences.h
diff --git a/chrome/browser/chromeos/preferences.h b/chrome/browser/chromeos/preferences.h
index db280aa137b70c8bbf76e8cd1c37a1b7214c6fbb..5124de54b4185f1ab92d0c7474e4eb76e72e9e78 100644
--- a/chrome/browser/chromeos/preferences.h
+++ b/chrome/browser/chromeos/preferences.h
@@ -29,6 +29,10 @@ class Preferences : public NotificationObserver {
   // This method will register the prefs associated with Chrome OS settings.
   static void RegisterUserPrefs(PrefService* prefs);
 
+  // This method is called when kLanguagePreferredVirtualKeyboard is updated to
+  // change the virtual keyboard settings to reflect the new value.
+  static void UpdateVirturalKeyboardPreference(PrefService* prefs);
+
   // This method will initialize Chrome OS settings to values in user prefs.
   void Init(PrefService* prefs);