Add a unit test for 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 8348064d9b624973d8299ebe85c22f5cd5090a48..01ebb4f4f389b4ca69735c78ebb77e9902c7e065 100644
--- a/ui/app_list/views/contents_view.h
+++ b/ui/app_list/views/contents_view.h
@@ -66,6 +66,7 @@ class ContentsView : public views::View {
   void Prerender();
 
   AppsContainerView* apps_container_view() { return apps_container_view_; }
+  StartPageView* start_page_view() { return start_page_view_; }
 
   ShowState show_state() const { return show_state_; }
 
@@ -90,6 +91,8 @@ class ContentsView : public views::View {
   PaginationModel* pagination_model_;  // Owned by AppListController.
 
   AppsContainerView* apps_container_view_;  // Owned by the views hierarchy.
+  StartPageView* start_page_view_;          // Owned by the views hierarchy.
+
   AppListMainView* app_list_main_view_;     // Parent view, owns this.
 
   scoped_ptr<views::ViewModel> view_model_;