Replace AllAppsTileItemView with ArrowExpandView

ui/app_list/views/start_page_view.h

 // Copyright 2014 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 UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_
 #define UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_
 
 #include <stddef.h>
 
 #include <vector>
 
 #include "base/macros.h"
 #include "ui/app_list/app_list_export.h"
 #include "ui/app_list/views/app_list_page.h"
 
 namespace app_list {
 
 class AppListMainView;
 class AppListView;
 class AppListViewDelegate;
 class CustomLauncherPageBackgroundView;
+class ExpandArrowView;
 class IndicatorChipView;
 class SearchResultTileItemView;
 class TileItemView;
 
 // The start page for the app list.
 class APP_LIST_EXPORT StartPageView : public AppListPage {
  public:
   StartPageView(AppListMainView* app_list_main_view,
                 AppListViewDelegate* view_delegate,
                 AppListView* app_list_view);
@@ skipping 40 matching lines @@
   // An invisible placeholder view which fills the space for the search box view
   // in a box layout. The search box view itself is a child of the AppListView
   // (because it is visible on many different pages).
   views::View* search_box_spacer_view_;  // Owned by views hierarchy.
 
   views::View* instant_container_;  // Owned by views hierarchy.
   CustomLauncherPageBackgroundView*
       custom_launcher_page_background_;       // Owned by views hierarchy.
   IndicatorChipView* indicator_ = nullptr;    // Owned by views hierarchy.
   StartPageTilesContainer* tiles_container_;  // Owned by views hierarchy.
+  ExpandArrowView* expand_arrow_view_ = nullptr;  // Owned by views hierarchy.
 
   const bool is_fullscreen_app_list_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(StartPageView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_