Add a unit test for the experimental app list.

ui/app_list/views/contents_view.cc

 // 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.
 
 #include "ui/app_list/views/contents_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "ui/app_list/app_list_constants.h"
@@ skipping 40 matching lines @@
 }
 
 }  // namespace
 
 ContentsView::ContentsView(AppListMainView* app_list_main_view,
                            PaginationModel* pagination_model,
                            AppListModel* model,
                            AppListViewDelegate* view_delegate)
     : show_state_(SHOW_APPS),
       pagination_model_(pagination_model),
+      start_page_view_(NULL),
       app_list_main_view_(app_list_main_view),
       view_model_(new views::ViewModel),
       bounds_animator_(new views::BoundsAnimator(this)) {
   DCHECK(model);
   pagination_model_->SetTransitionDurations(
       kPageTransitionDurationInMs,
       kOverscrollPageTransitionDurationMs);
 
   apps_container_view_ =
       new AppsContainerView(app_list_main_view, pagination_model, model);
   AddChildView(apps_container_view_);
   view_model_->Add(apps_container_view_, kIndexAppsContainer);
 
   SearchResultListView* search_results_view = new SearchResultListView(
       app_list_main_view, view_delegate);
   AddChildView(search_results_view);
   view_model_->Add(search_results_view, kIndexSearchResults);
 
   if (app_list::switches::IsExperimentalAppListEnabled()) {
-    StartPageView* start_page_view =
-        new StartPageView(app_list_main_view, view_delegate);
-    AddChildView(start_page_view);
-    view_model_->Add(start_page_view, kIndexStartPage);
+    start_page_view_ = new StartPageView(app_list_main_view, view_delegate);
+    AddChildView(start_page_view_);
+    view_model_->Add(start_page_view_, kIndexStartPage);
   }
 
   GetSearchResultListView(view_model_.get())->SetResults(model->results());
 }
 
 ContentsView::~ContentsView() {
 }
 
 void ContentsView::CancelDrag() {
   if (apps_container_view_->apps_grid_view()->has_dragged_view())
@@ skipping 216 matching lines @@
     if (!pagination_model_->has_transition()) {
       pagination_model_->SelectPageRelative(offset > 0 ? -1 : 1,
                                             true);
     }
     event->SetHandled();
     event->StopPropagation();
   }
 }
 
 }  // namespace app_list