Add MD ink drop ripple to shelf app items

ui/views/controls/button/custom_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 UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "ui/events/event_constants.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/animation/throb_animation.h"
 #include "ui/views/animation/ink_drop_state.h"
 #include "ui/views/controls/button/button.h"
 
 namespace views {
 
-class InkDropDelegate;
-
 // A button with custom rendering. The base of ImageButton and LabelButton.
 // Note that this type of button is not focusable by default and will not be
 // part of the focus chain, unless in accessibility mode. Call
 // SetFocusForPlatform() to make it part of the focus chain.
 class VIEWS_EXPORT CustomButton : public Button, public gfx::AnimationDelegate {
  public:
   // An enum describing the events on which a button should notify its listener.
   enum NotifyAction {
     NOTIFY_ON_PRESS,
     NOTIFY_ON_RELEASE,
@@ skipping 145 matching lines @@
   int triggerable_event_flags_;
 
   // See description above setter.
   bool request_focus_on_press_;
 
   // The event on which the button should notify its listener.
   NotifyAction notify_action_;
 
   // True when a button click should trigger an animation action on
   // ink_drop_delegate().
-  // TODO(bruthig): Use an InkDropAction enum and drop the flag.
   bool has_ink_drop_action_on_click_;
 
-  // The animation action to trigger on ink_drop_delegate() when the button
-  // is clicked.
-  InkDropState ink_drop_action_on_click_;
-
   // When true, the ink drop ripple and hover will be hidden prior to showing
   // the context menu.
   bool hide_ink_drop_when_showing_context_menu_;
 
   // The color of the ripple and hover.
   SkColor ink_drop_base_color_;
 
   DISALLOW_COPY_AND_ASSIGN(CustomButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_