Move cursor when it's hidden so that UX can update correctly

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index ac435e8dc5b274a157deb31de7be7f517e809102..c63e00c77df798c494b4a8d83e010b2a9902f325 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -338,6 +338,12 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // is no a pending task.
   void PostMouseMoveEventAfterWindowChange();
 
+  // Creates and dispatches synthesized mouse event using the
+  // current mouse location, if specified by |use_current_position| other wise
+  // passes an offscreen location of (-1, -1).
+  void SynthesizeMouseEvent(ui::EventType event_type,
+                            bool use_current_position);
+
   // Creates and dispatches synthesized mouse move event using the
   // current mouse location.
   void SynthesizeMouseMoveEvent();