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

ash/common/system/tray/system_menu_button.h

 // Copyright 2016 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_SYSTEM_TRAY_SYSTEM_MENU_BUTTON_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_MENU_BUTTON_H_
 
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
@@ skipping 25 matching lines @@
   // |icon|. |ink_drop_style| specifies which flavor of the ink drop should be
   // used. |accessible_name_id| corresponds to the string in
   // ui::ResourceBundle to use for the button's accessible and tooltip text.
   SystemMenuButton(views::ButtonListener* listener,
                    InkDropStyle ink_drop_style,
                    const gfx::VectorIcon& icon,
                    int accessible_name_id);
   ~SystemMenuButton() override;
 
   // views::ImageButton:
+  std::unique_ptr<views::InkDrop> CreateInkDrop() override;
   std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
   std::unique_ptr<views::InkDropHighlight> CreateInkDropHighlight()
       const override;
-  bool ShouldShowInkDropHighlight() const override;
 
  private:
   // Returns the size that the ink drop should be constructed with.
   gfx::Size GetInkDropSize() const;
 
   // Defines the flavor of ink drop ripple/highlight that should be constructed.
   InkDropStyle ink_drop_style_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemMenuButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_MENU_BUTTON_H_