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

tests/isolate/message2_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 serialization of messages.
 // VMOptions=--enable_type_checks --enable_asserts
 
 library Message2Test;
 import 'dart:isolate';
-import '../../pkg/unittest/lib/unittest.dart';
+import 'package:unittest/unittest.dart';
+import "remote_unittest_helper.dart";
 
 // ---------------------------------------------------------------------------
 // Message passing test 2.
 // ---------------------------------------------------------------------------
 
 class MessageTest {
   static void mapEqualsDeep(Map expected, Map actual) {
     expect(expected, isMap);
     expect(actual, isMap);
     expect(actual.length, expected.length);
@@ skipping 27 matching lines @@
       port.close();
     } else {
       // Bounce the received object back so that the sender
       // can make sure that the object matches.
       message[1].send(message[0]);
     }
   });
   replyPort.send(port.sendPort);
 }
 
-main() {
+void main([args, port]) {
+  if (testRemote(main, port)) return;
   test("map is equal after it is sent back and forth", () {
     ReceivePort port = new ReceivePort();
     Isolate.spawn(pingPong, port.sendPort);
     port.first.then(expectAsync1((remote) {
       Map m = new Map();
       m[1] = "eins";
       m[2] = "deux";
       m[3] = "tre";
       m[4] = "four";
       ReceivePort replyPort = new ReceivePort();
       remote.send([m, replyPort.sendPort]);
       replyPort.first.then(expectAsync1((var received) {
         MessageTest.mapEqualsDeep(m, received);
         remote.send(null);
       }));
     }));
   });
 }