Add a skeleton Start Page to the experimental app list.

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"
@@ skipping 11 matching lines @@
 namespace app_list {
 
 class AppsGridView;
 class ApplicationDragAndDropHost;
 class AppListFolderItem;
 class AppListMainView;
 class AppListModel;
 class AppListViewDelegate;
 class AppsContainerView;
 class PaginationModel;
+class StartPageView;
 
 // 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:
-  enum ShowState { SHOW_APPS, SHOW_SEARCH_RESULTS, };
+  enum ShowState {
+    SHOW_APPS,
+    SHOW_SEARCH_RESULTS,
+    SHOW_START_PAGE,
+  };
 
   ContentsView(AppListMainView* app_list_main_view,
                PaginationModel* pagination_model,
                AppListModel* model,
                AppListViewDelegate* view_delegate);
   virtual ~ContentsView();
 
   // The app list gets closed and drag and drop operations need to be cancelled.
   void CancelDrag();
 
@@ skipping 26 matching lines @@
   void AnimateToIdealBounds();
 
   // 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.
 
   AppsContainerView* apps_container_view_;  // Owned by the views hierarchy.
+  AppListMainView* app_list_main_view_;     // Owned by the views hierarchy.

[xiyuan, 2014/05/08 16:17:48]

Think tapted@'s suggesiont is better. "// Parent view, owns this."

It is more useful to point out |app_list_main_view_| is parent of ContentsView.
|apps_container_view_| above is a child view. Using similar comments would
mislead reader to think |app_list_main_view_| is also a child.

[calamity, 2014/05/09 07:09:39]

Done.

 
   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_