Add a skeleton Start Page to the experimental app list.

ui/app_list/views/contents_view.h

Index: ui/app_list/views/contents_view.h
diff --git a/ui/app_list/views/contents_view.h b/ui/app_list/views/contents_view.h
index 6b9d4a94c58b900502c6e8e567491b71483726f8..9d6ad846e8ef1de051a868943e764ca439cb8bca 100644
--- a/ui/app_list/views/contents_view.h
+++ b/ui/app_list/views/contents_view.h
@@ -29,6 +29,7 @@ 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
@@ -39,6 +40,7 @@ class ContentsView : public views::View {
   enum ShowState {
     SHOW_APPS,
     SHOW_SEARCH_RESULTS,
+    SHOW_START_PAGE,

[tapted, 2014/03/10 02:41:54]

Maybe go with SHOW_SEARCH_PAGE? I don't think we should mix the meanings of the
current search page unless we are ready to replace it completely.

[calamity, 2014/03/14 07:50:02]

See below.

   };
 
   ContentsView(AppListMainView* app_list_main_view,
@@ -86,6 +88,8 @@ class ContentsView : public views::View {
   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.

[tapted, 2014/03/10 02:41:54]

In keeping with the other GetFooView(..) functions, this could perhaps be (a
member function)

AppListMainView* ContentsView::GetMainView() {
  return static_cast<AppListMainView*>(parent());
}

This would also be a closer match to what's done for the folder view in
apps_grid_view.cc. But I think either is OK (both have merits, so I'll let you
decide).

[calamity, 2014/03/14 07:50:02]

Done.

+  StartPageView* start_page_view_;  // Owned by the views hierarchy.

[tapted, 2014/03/10 02:41:54]

This doesn't seem to be used/initialized - remove?

[calamity, 2014/03/14 07:50:02]

Done.

 
   scoped_ptr<views::ViewModel> view_model_;
   scoped_ptr<views::BoundsAnimator> bounds_animator_;