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

dart/tests/try/web/internal_error_test.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.internal_error_test;
 
 import 'dart:html';
 import 'dart:async';
 
 import 'package:try/src/interaction_manager.dart' show
     InteractionManager,
     TRY_DART_NEW_DEFECT;
 
 import 'package:try/src/ui.dart' show
     mainEditorPane,
     observer,
     outputDiv;
 
 import 'package:try/src/user_option.dart' show
     UserOption;
 
-import '../../pkg/expect/lib/expect.dart';
-import '../../pkg/async_helper/lib/async_helper.dart';
+import 'package:expect/expect.dart';
+import 'package:async_helper/async_helper.dart';
 
 main() {
   UserOption.storage = {};
 
   var interaction = new InteractionManager();
   mainEditorPane = new DivElement();
   outputDiv = new PreElement();
   document.body.append(mainEditorPane);
   observer = new MutationObserver((mutations, observer) {
     try {
       interaction.onMutation(mutations, observer);
     } catch (e) {
       // Ignored.
     }
   });
   observer.observe(
       mainEditorPane, childList: true, characterData: true, subtree: true);
 
   mainEditorPane.innerHtml = 'main() { print("hello"); }';
 
   interaction.currentCompilationUnit = null; // This will provoke a crash.
 
   asyncTest(() {
     return new Future(() {
       Expect.isTrue(outputDiv.text.contains(TRY_DART_NEW_DEFECT));
     });
   });
 }