Make the cursor have separate mode for disabled mouse events and invisible.

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 3770d9e299e78e5226395ced38e10f68240e924d..bdff77bee114a1caca709a6337d3a82aeab95cd3 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -114,8 +114,8 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // used.
   void SetCursor(gfx::NativeCursor cursor);
 
-  // Invoked when the cursor's visibility has changed.
-  void OnCursorVisibilityChanged(bool visible);
+  // Invoked when the cursor gets enabled or disabled.
+  void OnCursorEnableStateChanged(bool enabled);
 
   // Moves the cursor to the specified location relative to the root window.
   virtual void MoveCursorTo(const gfx::Point& location) OVERRIDE;