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

tests/isolate/cross_isolate_message_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.
 
 // Dart test program for testing that isolates can communicate to isolates
 // other than the main isolate.
 
 library CrossIsolateMessageTest;
 import 'dart:isolate';
-import '../../pkg/unittest/lib/unittest.dart';
+import 'package:unittest/unittest.dart';
+import "remote_unittest_helper.dart";
 
 /*
  * Everything starts in the main-isolate (in the main-method).
  * The main isolate spawns two isolates: isolate1 (with entry point
  * 'crossIsolate1') and isolate2 (with entry point 'crossIsolate2').
  *
  * The main isolate creates two isolates, isolate1 and isolate2.
  * The second isolate is created with a send-port being listened on by
  * isolate1. A message is passed along this from isolate2 to isolate1.
  * Isolate1 then sends the result back to the main isolate for final checking.
  */
 
 void crossIsolate1(SendPort mainIsolate) {
   ReceivePort local = new ReceivePort();
   mainIsolate.send(["ready1", local.sendPort]);
   local.first.then((msg) {
     // Message from crossIsolate2
     expect(msg[0], "fromIsolate2");
     mainIsolate.send(["fromIsolate1", msg[1] + 58]);  // 100.
   });
 }
 
 void crossIsolate2(SendPort toIsolate1) {
   toIsolate1.send(["fromIsolate2", 42]);
 }
 
-main() {
+void main([args, port]) {
+  if (testRemote(main, port)) return;
   test("send message cross isolates ", () {
     ReceivePort fromIsolate1 = new ReceivePort();
     Isolate.spawn(crossIsolate1, fromIsolate1.sendPort);
     var done = expectAsync0((){});
     fromIsolate1.listen((msg) {
       switch (msg[0]) {
         case "ready1":
           SendPort toIsolate1 = msg[1];
           Isolate.spawn(crossIsolate2, toIsolate1);
           break;
         case "fromIsolate1":
           expect(msg[1], 100);
           fromIsolate1.close();
           break;
         default:
           fail("unreachable! Tag: ${msg[0]}");
       }
     }, onDone: done);
   });
 }