Make isolate tests work on drt (and hopefully dartium).

tests/isolate/browser/compute_this_script_browser_test.dart

 // Copyright (c) 2012, 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.
 
 // Test that spawn works even when there are many script files in the page.
 // This requires computing correctly the URL to the orignal script, so we can
 // pass it to the web worker APIs.
 library compute_this_script;
 
 import 'dart:html';
 import 'dart:isolate';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
+import "../remote_unittest_helper.dart";
 
 child(var message) {
   var data = message[0];
   var reply = message[1];
   reply.send('re: $data');
 }
 
-main() {
+void main([args, port]) {
+  if (testRemote(main, port)) return;
   useHtmlConfiguration();
   var script = new ScriptElement();
   document.body.append(script);
   test('spawn with other script tags in page', () {
     ReceivePort port = new ReceivePort();
     port.listen(expectAsync1((msg) {
       expect(msg, equals('re: hi'));
       port.close();
     }));
 
     Isolate.spawn(child, ['hi', port.sendPort]);
   });
 }