Add MD ink drop ripple to shelf app items

ash/shelf/shelf_button.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_BUTTON_H_
 #define ASH_SHELF_SHELF_BUTTON_H_
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
 #include "ui/gfx/shadow_value.h"
@@ skipping 36 matching lines @@
   const gfx::ImageSkia& GetImage() const;
 
   // |state| is or'd into the current state.
   void AddState(State state);
   void ClearState(State state);
   int state() const { return state_; }
 
   // Returns the bounds of the icon.
   gfx::Rect GetIconBounds() const;
 
+  // Called when user started dragging the shelf button.
+  void OnDragStarted();
+
   // Overrides to views::CustomButton:
   void ShowContextMenu(const gfx::Point& p,
                        ui::MenuSourceType source_type) override;
 
   // View override - needed by unit test.
   void OnMouseCaptureLost() override;
 
  protected:
   // View overrides:
   const char* GetClassName() const override;
   bool OnMousePressed(const ui::MouseEvent& event) override;
   void OnMouseReleased(const ui::MouseEvent& event) override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
   void GetAccessibleState(ui::AXViewState* state) override;
   void Layout() override;
   void ChildPreferredSizeChanged(views::View* child) override;
   void OnFocus() override;
   void OnBlur() override;
   void OnPaint(gfx::Canvas* canvas) override;
 
   // ui::EventHandler overrides:
   void OnGestureEvent(ui::GestureEvent* event) override;
 
+  // views::CustomButton overrides:
+  std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
+  bool ShouldEnterPushedState(const ui::Event& event) override;
+  bool ShouldShowInkDropHighlight() const override;
+  void NotifyClick(const ui::Event& event) override;
+
   // Sets the icon image with a shadow.
   void SetShadowedImage(const gfx::ImageSkia& bitmap);
 
  private:
   class BarView;
 
   // Updates the parts of the button to reflect the current |state_| and
   // alignment. This may add or remove views, layout and paint.
   void UpdateState();
 
@@ skipping 17 matching lines @@
   // If non-null the destuctor sets this to true. This is set while the menu is
   // showing and used to detect if the menu was deleted while running.
   bool* destroyed_flag_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_BUTTON_H_