Snap widgets to pixel boundary on ash

ash/wm/status_area_layout_manager.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_STATUS_AREA_LAYOUT_MANAGER_H_
 #define ASH_WM_STATUS_AREA_LAYOUT_MANAGER_H_
 
+#include "ash/snap_to_pixel_layout_manager.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/layout_manager.h"
 
 namespace ash {
 class ShelfWidget;
 
 // StatusAreaLayoutManager is a layout manager responsible for the status area.
 // In any case when status area needs relayout it redirects this call to
 // ShelfLayoutManager.
-class StatusAreaLayoutManager : public aura::LayoutManager {
+class StatusAreaLayoutManager : public SnapToPixelLayoutManager {
  public:
-  explicit StatusAreaLayoutManager(ShelfWidget* shelf);
+  StatusAreaLayoutManager(aura::Window* container, ShelfWidget* shelf);
   virtual ~StatusAreaLayoutManager();
 
   // Overridden from aura::LayoutManager:
   virtual void OnWindowResized() OVERRIDE;
-  virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
-  virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
-  virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE;
-  virtual void OnChildWindowVisibilityChanged(aura::Window* child,
-                                              bool visible) OVERRIDE;
   virtual void SetChildBounds(aura::Window* child,
                               const gfx::Rect& requested_bounds) OVERRIDE;
 
  private:
   // Updates layout of the status area. Effectively calls ShelfLayoutManager
   // to update layout of the shelf.
   void LayoutStatusArea();
 
   // True when inside LayoutStatusArea method.
   // Used to prevent calling itself again from SetChildBounds().
   bool in_layout_;
 
   ShelfWidget* shelf_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_STATUS_AREA_LAYOUT_MANAGER_H_