Enable CursorManager::LockCursor to lock cursor visibility.

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 71b72f0a2d16f697287e671ceb4da0c35eba5d87..6028ff24d0541103f329aebf21907e6cf9ba05f1 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -104,7 +104,6 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   ui::Compositor* compositor() { return compositor_.get(); }
   gfx::NativeCursor last_cursor() const { return last_cursor_; }
   Window* mouse_pressed_handler() { return mouse_pressed_handler_; }
-  bool cursor_shown() const { return cursor_shown_; }
 
   void set_focus_manager(FocusManager* focus_manager) {
     focus_manager_ = focus_manager;
@@ -140,8 +139,8 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // used.
   void SetCursor(gfx::NativeCursor cursor);
 
-  // Shows or hides the cursor.
-  void ShowCursor(bool show);
+  // Invoked when the cursor's visibility has changed.
+  void OnCursorVisibilityChanged(bool visible);
 
   // Moves the cursor to the specified location relative to the root window.
   virtual void MoveCursorTo(const gfx::Point& location) OVERRIDE;
@@ -379,9 +378,6 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // Last cursor set.  Used for testing.
   gfx::NativeCursor last_cursor_;
 
-  // Is the cursor currently shown?  Used for testing.
-  bool cursor_shown_;
-
   ObserverList<RootWindowObserver> observers_;
 
   Window* mouse_pressed_handler_;