Update StickyKeys overlay to show or hide AltGr depending on the

ash/sticky_keys/sticky_keys_overlay.h

Index: ash/sticky_keys/sticky_keys_overlay.h
diff --git a/ash/sticky_keys/sticky_keys_overlay.h b/ash/sticky_keys/sticky_keys_overlay.h
index 88d195a7843e179f4686418c688fbf3682a6f23d..3a60a34cf0b13280a9d6dac08a1f02a8047471da 100644
--- a/ash/sticky_keys/sticky_keys_overlay.h
+++ b/ash/sticky_keys/sticky_keys_overlay.h
@@ -36,6 +36,8 @@ class ASH_EXPORT StickyKeysOverlay : public ui::LayerAnimationObserver {
   // Shows or hides the overlay.
   void Show(bool visible);
 
+  void SetModifiersVisible(bool mod3_visible, bool altgr_visible);

[Tim Song, 2014/03/05 19:22:27]

It doesn't hurt to make this generic as it's possible to disable ctrl, alt, and
shift through the keyboard settings, and one day we might want to update the UI
to reflect this.

[Zachary Kuznia, 2014/03/05 21:12:30]

Done.

+
   // Updates the overlay with the current state of a sticky key modifier.
   void SetModifierKeyState(ui::EventFlags modifier,
                            StickyKeyState state);