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

ash/common/shelf/app_list_button.h

Index: ash/common/shelf/app_list_button.h
diff --git a/ash/common/shelf/app_list_button.h b/ash/common/shelf/app_list_button.h
index af0fdbd9d4192fd552694607b66fa31ae5b5ab5f..147f50beb553c45eb0ebe52e86b3a605064b53de 100644
--- a/ash/common/shelf/app_list_button.h
+++ b/ash/common/shelf/app_list_button.h
@@ -9,6 +9,10 @@
 #include "base/macros.h"
 #include "ui/views/controls/button/image_button.h"
 
+namespace views {
+class InkDrop;
+}  // namespace views
+
 namespace ash {
 class InkDropButtonListener;
 class ShelfView;
@@ -41,7 +45,7 @@ class ASH_EXPORT AppListButton : public views::ImageButton {
   std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
   void NotifyClick(const ui::Event& event) override;
   bool ShouldEnterPushedState(const ui::Event& event) override;
-  bool ShouldShowInkDropHighlight() const override;
+  std::unique_ptr<views::InkDrop> CreateInkDrop() override;
 
   // ui::EventHandler overrides:
   void OnGestureEvent(ui::GestureEvent* event) override;