Add hierarchy utils and use them in search.

pkg/analysis_services/test/search/test_all.dart

Index: pkg/analysis_services/test/search/test_all.dart
diff --git a/pkg/analysis_services/test/search/test_all.dart b/pkg/analysis_services/test/search/test_all.dart
index 36c496c5a5db48bb677be5b2102b47890cd4f847..86364491209dae7ac9f4dd6073c862b217027724 100644
--- a/pkg/analysis_services/test/search/test_all.dart
+++ b/pkg/analysis_services/test/search/test_all.dart
@@ -6,6 +6,7 @@ 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;
 
 
@@ -15,6 +16,7 @@ import 'search_engine_test.dart' as search_engine_test;
 main() {
   groupSep = ' | ';
   group('search', () {
+    hierarchy_test.main();
     search_engine_test.main();
   });
-}
+}