Add (an as yet unused) task

pkg/analyzer/test/task/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 smoke.test.mirrors_test;
+library test.task;
 
-import 'package:smoke/mirrors.dart';
 import 'package:unittest/unittest.dart';
-import 'common.dart' as common show main;
 
+import 'task_dart_test.dart' as task_dart_test;
+
+/// Utility for manually running all tests.
 main() {
-  setUp(useMirrors);
-  common.main();
+  groupSep = ' | ';
+  group('generated tests', () {
+    task_dart_test.main();
+  });
 }