[ash-md] Added different highlighting modes to the InkDropImpl.

ash/common/shelf/overflow_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_COMMON_SHELF_OVERFLOW_BUTTON_H_
 #define ASH_COMMON_SHELF_OVERFLOW_BUTTON_H_
 
 #include "base/macros.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/controls/button/custom_button.h"
@@ skipping 12 matching lines @@
   void OnShelfAlignmentChanged();
   void OnOverflowBubbleShown();
   void OnOverflowBubbleHidden();
 
   // Sets alpha value of the background and schedules a paint.
   void SetBackgroundAlpha(int alpha);
 
  private:
   // views::CustomButton:
   void OnPaint(gfx::Canvas* canvas) override;
+  std::unique_ptr<views::InkDrop> CreateInkDrop() override;
   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;
 
   // Helper functions to paint the background and foreground of the button
   // at |bounds|.
   void PaintBackground(gfx::Canvas* canvas, const gfx::Rect& bounds);
   void PaintForeground(gfx::Canvas* canvas, const gfx::Rect& bounds);
 
   // Returns the id of the asset to use for the button backgound based on the
   // current shelf state.
   // TODO(tdanderson): Remove this once the material design shelf is enabled
@@ skipping 21 matching lines @@
 
   // Alpha value used to paint the background.
   int background_alpha_;
 
   DISALLOW_COPY_AND_ASSIGN(OverflowButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_OVERFLOW_BUTTON_H_