Implement app list folder management page UI.

ui/app_list/views/contents_view.h

 // Copyright (c) 2012 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_CONTENTS_VIEW_H_
 #define UI_APP_LIST_VIEWS_CONTENTS_VIEW_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/views/view.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace views {
 class BoundsAnimator;
 class ViewModel;
 }
 
 namespace app_list {
 
 class AppsGridView;
 class ApplicationDragAndDropHost;
+class AppListFolderItem;
 class AppListMainView;
 class AppListModel;
 class AppListViewDelegate;
+class AppsContainerView;
 class PaginationModel;
 
 // A view to manage sub views under the search box (apps grid view + page
 // switcher and search results). The two sets of sub views are mutually
 // exclusive. ContentsView manages a show state to choose one set to show
 // and animates the transition between show states.
 class ContentsView : public views::View {
  public:
   ContentsView(AppListMainView* app_list_main_view,
                PaginationModel* pagination_model,
                AppListModel* model,
                content::WebContents* start_page_contents);
   virtual ~ContentsView();
 
   // The app list gets closed and drag and drop operations need to be cancelled.
   void CancelDrag();
 
   // If |drag_and_drop| is not NULL it will be called upon drag and drop
   // operations outside the application list.
   void SetDragAndDropHostOfCurrentAppList(
       ApplicationDragAndDropHost* drag_and_drop_host);
 
   void ShowSearchResults(bool show);
+  void ShowFolderContent(AppListFolderItem* folder);
+  void ShowApps();
 
   void Prerender();
 
  private:
   enum ShowState {
     SHOW_APPS,
     SHOW_SEARCH_RESULTS,
   };
 
   // Sets show state.
@@ skipping 11 matching lines @@
   virtual bool OnKeyPressed(const ui::KeyEvent& event) OVERRIDE;
   virtual bool OnMouseWheel(const ui::MouseWheelEvent& event) OVERRIDE;
 
   // Overridden from ui::EventHandler:
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
   virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
 
   ShowState show_state_;
   PaginationModel* pagination_model_;  // Owned by AppListController.
 
-  AppsGridView* apps_grid_view_;  // Owned by the view.
+  AppsContainerView* apps_container_view_; // Owned by the views hierarchy.
 
   scoped_ptr<views::ViewModel> view_model_;
   scoped_ptr<views::BoundsAnimator> bounds_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentsView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_CONTENTS_VIEW_H_