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

dart/tests/try/poi/poi_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.
 
-import "dart:async";
-import 'package:expect/expect.dart';
+library trydart.poi_test;
+
+import 'dart:io' show
+    Platform;
+
+import 'package:try/poi/poi.dart' as poi;
+
 import 'package:async_helper/async_helper.dart';
 
-@l import "deferred_no_such_method_lib.dart" as lib;
-
-const l = const DeferredLibrary('lib');
-
 void main() {
-  asyncStart();
-  l.load().then((_) {
-    Expect.equals(42, new lib.C().nonExisting());
-    asyncEnd();
-  });
-}
+  poi.main(<String>[Platform.script.toFilePath(), '339']);
+  asyncTest(() => poi.doneFuture);
+}