Add a skeleton Start Page to the experimental app list.

ui/app_list/views/apps_grid_view.cc

Index: ui/app_list/views/apps_grid_view.cc
diff --git a/ui/app_list/views/apps_grid_view.cc b/ui/app_list/views/apps_grid_view.cc
index 4016d5fdf965b1ad2dd85260b8ab7c9cf8fdd005..0cbdffca5fe2b015111f25d55a016e98b95ea4cf 100644
--- a/ui/app_list/views/apps_grid_view.cc
+++ b/ui/app_list/views/apps_grid_view.cc
@@ -328,7 +328,7 @@ AppsGridView::AppsGridView(AppsGridViewDelegate* delegate,
   pagination_model_->AddObserver(this);
   AddChildView(page_switcher_view_);
 
-  if (start_page_contents) {
+  if (start_page_contents && app_list::switches::IsStartPageWebUIEnabled()) {

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

With StartPageService::GetSearchPageContents(..) this change shouldn't be needed

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

Holding off on this in case we can just remove the web contents from the
AppsGridView entirely.

     start_page_view_ =
         new views::WebView(start_page_contents->GetBrowserContext());
     start_page_view_->SetWebContents(start_page_contents);