Fixing problem with not showing bubble

ash/wm/workspace/frame_maximize_button.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_WM_WORKSPACE_FRAME_MAXIMIZE_BUTTON_H_
 #define ASH_WM_WORKSPACE_FRAME_MAXIMIZE_BUTTON_H_
 
 #include "ash/ash_export.h"
 #include "ash/wm/workspace/snap_types.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 37 matching lines @@
   bool is_snap_enabled() const { return is_snap_enabled_; }
 
   // WindowObserver overrides:
   virtual void OnWindowBoundsChanged(aura::Window* window,
                                      const gfx::Rect& old_bounds,
                                      const gfx::Rect& new_bounds) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   // ImageButton overrides:
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
-  virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseMoved(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
   virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual ui::GestureStatus OnGestureEvent(
       const views::GestureEvent& event) OVERRIDE;
 
   // Unit test overwrite: Change the UI delay used for the bubble show up.
   void set_bubble_appearance_delay_ms(int bubble_appearance_delay_ms) {
     bubble_appearance_delay_ms_ = bubble_appearance_delay_ms;
@@ skipping 80 matching lines @@
 
   // The delay of the bubble appearance.
   int bubble_appearance_delay_ms_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameMaximizeButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_FRAME_MAXIMIZE_BUTTON_H_