Support for debugging DDC tests under devtool

pkg/dev_compiler/tool/run.js

 // Copyright (c) 2016, 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.
 
+/// This is a utility to run and debug an individual DDC compiled test.
+/// Tests can be run with either node or devtool (a Chrome-based utility with
+/// DOM APIs and developer tools support).
+///
+/// Install devtool via:
+/// > npm install -g devtool
+///
+/// Run via:
+/// > devtool tool/run.js -- corelib/apply2_test
+/// or
+/// > node tool/run.js corelib/apply2_test
+///
+/// See TODO below on async / unittest support. 
+
 var args = process.argv.slice(2);
 if (args.length != 1) {
-  throw new Error("Usage: node test/run.js <test-module-name>");
+  throw new Error("Usage: devtool tool/run.js <test-module-name>");
 }
 var test = args[0];
 
 var requirejs = require('requirejs');
 var ddcdir = __dirname + '/../';
 requirejs.config({
   baseUrl: ddcdir + 'gen/codegen_output',
   paths: {
     dart_sdk: ddcdir + 'lib/js/amd/dart_sdk',
     async_helper: ddcdir + 'gen/codegen_output/pkg/async_helper',
     expect: ddcdir + 'gen/codegen_output/pkg/expect',
     js: ddcdir + 'gen/codegen_output/pkg/js',
     matcher: ddcdir + 'gen/codegen_output/pkg/matcher',
     minitest: ddcdir + 'gen/codegen_output/pkg/minitest',
     path: ddcdir + 'gen/codegen_output/pkg/path',
     stack_trace: ddcdir + 'gen/codegen_output/pkg/stack_trace',
     unittest: ddcdir + 'gen/codegen_output/pkg/unittest',
   }
 });
 
 // TODO(vsm): Factor out test framework code in test/browser/language_tests.js
 // and use here.  Async tests and unittests won't work without it.
-
+var sdk = requirejs('dart_sdk');
 var module = requirejs(test);
-test = test.split('/').slice(-1)[0];
-module[test].main();
+var lib = test.split('/').slice(-1)[0];
+try {
+  module[lib].main();
+  console.log('Test ' + test + ' passed.');
+} catch (e) {
+  console.log('Test ' + test + ' failed:\n' + e.toString());
+  sdk.dart.stackPrint(e);
+}