Add "point of interest" app for command-line testing of dart2js type information.

dart/tests/try/web/test_case.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 trydart.test_case;
 
 import 'dart:html' show
     document;
 
 import 'dart:async';
 
-import '../../pkg/async_helper/lib/async_helper.dart';
+import 'package:async_helper/async_helper.dart';
 
 typedef void VoidFunction();
 
 class TestCase {
   final String description;
   final VoidFunction setup;
   final VoidFunction validate;
 
   TestCase(this.description, this.setup, this.validate);
 }
@@ skipping 29 matching lines @@
         print('${test.description}\nDone.');
         iterateTests(iterator);
       });
     } else {
       completer.complete(null);
     }
   }
 
   iterateTests(tests.iterator);
 }