Adjust MD shelf app list icon for better centering.

ash/common/shelf/app_list_button.h

 // Copyright 2014 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_COMMON_SHELF_APP_LIST_BUTTON_H_
 #define ASH_COMMON_SHELF_APP_LIST_BUTTON_H_
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
 #include "ui/views/controls/button/image_button.h"
@@ skipping 32 matching lines @@
   bool ShouldEnterPushedState(const ui::Event& event) override;
   std::unique_ptr<views::InkDrop> CreateInkDrop() override;
 
   // ui::EventHandler overrides:
   void OnGestureEvent(ui::GestureEvent* event) override;
 
  private:
   // Toggles the active state for painting the background and schedules a paint.
   void SetDrawBackgroundAsActive(bool draw_background_as_active);
 
-  // Helper functions to paint the background and foreground of the AppList
+  // Helper function to paint the background and foreground of the AppList
   // button in Chrome OS MD.
-  void PaintBackgroundMD(gfx::Canvas* canvas);
-  void PaintForegroundMD(gfx::Canvas* canvas,
-                         const gfx::ImageSkia& foreground_image);
+  void PaintMd(gfx::Canvas* canvas);
 
   // Helper function to paint the AppList button in Chrome OS non-MD.
   void PaintAppListButton(gfx::Canvas* canvas,
                           const gfx::ImageSkia& foreground_image);
 
   // True if the background should render as active, regardless of the state of
   // the application list.
   bool draw_background_as_active_;
 
   // Alpha value used to paint the background.
   int background_alpha_;
 
   InkDropButtonListener* listener_;
   ShelfView* shelf_view_;
   WmShelf* wm_shelf_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_APP_LIST_BUTTON_H_