Add MD ink drop ripple to app list button

ui/app_list/presenter/app_list_presenter_impl.h

Index: ui/app_list/presenter/app_list_presenter_impl.h
diff --git a/ui/app_list/presenter/app_list_presenter_impl.h b/ui/app_list/presenter/app_list_presenter_impl.h
index 0c7dfb308faafb84e0cb958fb5d751f06fa9bc3e..74d5b72327d0a1f4de11b2d39bc9e8995d367de7 100644
--- a/ui/app_list/presenter/app_list_presenter_impl.h
+++ b/ui/app_list/presenter/app_list_presenter_impl.h
@@ -55,14 +55,12 @@ class APP_LIST_PRESENTER_EXPORT AppListPresenterImpl
   void Show(int64_t display_id) override;
   void Dismiss() override;
   void ToggleAppList(int64_t display_id) override;
+  bool IsVisible() const override;
   bool GetTargetVisibility() const override;
 
  private:
   friend class test::AppListPresenterImplTestApi;
 
-  // Whether the app list's aura::Window is currently visible.
-  bool IsVisible() const;
-
   // Sets the app list view and attempts to show it.
   void SetView(AppListView* view);