Add hierarchy utils and use them in search.

pkg/analysis_services/test/search/test_all.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.services.src.search.all;
 
 import 'package:unittest/unittest.dart';
 
+import 'hierarchy_test.dart' as hierarchy_test;
 import 'search_engine_test.dart' as search_engine_test;
 
 
 /**
  * Utility for manually running all tests.
  */
 main() {
   groupSep = ' | ';
   group('search', () {
+    hierarchy_test.main();
     search_engine_test.main();
   });
-}
+}