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

ash/common/system/tray/system_menu_button.h

Index: ash/common/system/tray/system_menu_button.h
diff --git a/ash/common/system/tray/system_menu_button.h b/ash/common/system/tray/system_menu_button.h
index 86937bed6e3d0ec0f32a05c10258be2775f749d8..8bf485a04bcab97019e00478b13b6e177023d109 100644
--- a/ash/common/system/tray/system_menu_button.h
+++ b/ash/common/system/tray/system_menu_button.h
@@ -43,10 +43,10 @@ class SystemMenuButton : public views::ImageButton {
   ~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.