Add search results to experimental app list start page.

ui/app_list/views/app_list_main_view.cc

 // Copyright 2013 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/app_list_main_view.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 235 matching lines @@
 void AppListMainView::GetShortcutPathForApp(
     const std::string& app_id,
     const base::Callback<void(const base::FilePath&)>& callback) {
   delegate_->GetShortcutPathForApp(app_id, callback);
 }
 
 void AppListMainView::QueryChanged(SearchBoxView* sender) {
   base::string16 query;
   base::TrimWhitespace(model_->search_box()->text(), base::TRIM_ALL, &query);
   bool should_show_search = !query.empty();
-  contents_view_->ShowSearchResults(should_show_search);
+
+  ContentsView::ShowState show_state = ContentsView::SHOW_SEARCH_RESULTS;
+  if (!should_show_search) {
+    show_state = app_list::switches::IsExperimentalAppListEnabled()
+                     ? ContentsView::SHOW_START_PAGE
+                     : ContentsView::SHOW_APPS;
+  }
+  contents_view_->SetShowState(show_state);
 
   if (should_show_search)
     delegate_->StartSearch();
   else
     delegate_->StopSearch();
 }
 
 void AppListMainView::OnResultInstalled(SearchResult* result) {
   // Clears the search to show the apps grid. The last installed app
   // should be highlighted and made visible already.
   search_box_view_->ClearSearch();
 }
 
 void AppListMainView::OnResultUninstalled(SearchResult* result) {
   // Resubmit the query via a posted task so that all observers for the
   // uninstall notification are notified.
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&AppListMainView::QueryChanged,
                  weak_ptr_factory_.GetWeakPtr(),
                  search_box_view_));
 }
 
 }  // namespace app_list