Implement app list folder management page UI.

ui/app_list/views/apps_grid_view.h

Index: ui/app_list/views/apps_grid_view.h
diff --git a/ui/app_list/views/apps_grid_view.h b/ui/app_list/views/apps_grid_view.h
index 8d996a6c75f375060ed4bae0c6ea24e436866674..31f2fed2f140cc157c7322f61b995cca15980360 100644
--- a/ui/app_list/views/apps_grid_view.h
+++ b/ui/app_list/views/apps_grid_view.h
@@ -78,6 +78,9 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   // Sets |model| to use. Note this does not take ownership of |model|.
   void SetModel(AppListModel* model);
 
+  // Set |apps| to renders. Note this does not take ownership of |apps|.
+  void SetApps(AppListModel::Apps* apps);
+
   void SetSelectedView(views::View* view);
   void ClearSelectedView(views::View* view);
   bool IsSelectedView(const views::View* view) const;
@@ -131,9 +134,6 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   // Stops the timer that triggers a page flip during a drag.
   void StopPageFlipTimer();
 
-  // Get the last grid view which was created.
-  static AppsGridView* GetLastGridViewForTest();
-
   // Return the view model for test purposes.
   const views::ViewModel* view_model_for_test() const { return &view_model_; }
 
@@ -272,6 +272,7 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   void SetViewHidden(views::View* view, bool hide, bool immediate);
 
   AppListModel* model_;  // Owned by AppListView.
+  AppListModel::Apps* apps_;  // Not owned.
   AppsGridViewDelegate* delegate_;
   PaginationModel* pagination_model_;  // Owned by AppListController.
   PageSwitcher* page_switcher_view_;  // Owned by views hierarchy.