Add MD ink drop ripple to app list button

ash/shelf/shelf.h

 // Copyright 2013 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_H_
 #define ASH_SHELF_SHELF_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 17 matching lines @@
 
 namespace gfx {
 class Rect;
 }
 
 namespace views {
 class View;
 }
 
 namespace ash {
+class AppListButton;
 class FocusCycler;
 class ShelfDelegate;
 class ShelfIconObserver;
 class ShelfModel;
 class ShelfView;
 class WmShelf;
 
 namespace test {
 class ShelfTestAPI;
 }
@@ skipping 81 matching lines @@
   // Returns true if the shelf is showing a context menu.
   bool IsShowingMenu() const;
 
   bool IsShowingOverflowBubble() const;
 
   void SetVisible(bool visible) const;
   bool IsVisible() const;
 
   void SchedulePaint();
 
-  views::View* GetAppListButtonView() const;
+  AppListButton* GetAppListButton() const;
 
   // Launch a 0-indexed shelf item in the shelf.
   // A negative index launches the last shelf item in the shelf.
   void LaunchAppIndexAt(int item_index);
 
   ShelfWidget* shelf_widget() { return shelf_widget_; }
 
   // TODO(msw): ShelfLayoutManager should not be accessed externally.
   ShelfLayoutManager* shelf_layout_manager() {
     return shelf_widget_->shelf_layout_manager();
@@ skipping 18 matching lines @@
 
   ShelfAlignment alignment_ = SHELF_ALIGNMENT_BOTTOM;
   ShelfAutoHideBehavior auto_hide_behavior_ = SHELF_AUTO_HIDE_BEHAVIOR_NEVER;
 
   DISALLOW_COPY_AND_ASSIGN(Shelf);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_H_