Add MD ink drop ripple to app list button

ash/shelf/shelf_view.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_SHELF_SHELF_VIEW_H_
 #define ASH_SHELF_SHELF_VIEW_H_
 
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 19 matching lines @@
 namespace ui {
 class MenuModel;
 }
 
 namespace views {
 class BoundsAnimator;
 class MenuRunner;
 }
 
 namespace ash {
+class AppListButton;
 class DragImageView;
 class OverflowBubble;
 class OverflowButton;
 class Shelf;
 class ShelfButton;
 class ShelfDelegate;
 class ShelfIconObserver;
 class ShelfItemDelegateManager;
 class ShelfModel;
 struct ShelfItem;
@@ skipping 46 matching lines @@
 
   // Returns true if overflow bubble is shown.
   bool IsShowingOverflowBubble() const;
 
   // Sets owner overflow bubble instance from which this shelf view pops
   // out as overflow.
   void set_owner_overflow_bubble(OverflowBubble* owner) {
     owner_overflow_bubble_ = owner;
   }
 
-  views::View* GetAppListButtonView() const;
+  AppListButton* GetAppListButton() const;
 
   // Returns true if the mouse cursor exits the area for launcher tooltip.
   // There are thin gaps between launcher buttons but the tooltip shouldn't hide
   // in the gaps, but the tooltip should hide if the mouse moved totally outside
   // of the buttons area.
   bool ShouldHideTooltip(const gfx::Point& cursor_location) const;
 
   // Returns true if a tooltip should be shown for the shelf item |view|.
   bool ShouldShowTooltipForView(const views::View* view) const;
 
@@ skipping 344 matching lines @@
 
   // Tracks UMA metrics based on shelf button press actions.
   ShelfButtonPressedMetricTracker shelf_button_pressed_metric_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_VIEW_H_