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

tests/isolate/isolate_complex_messages_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 isolate communication with
 // complex messages.
 
 library IsolateComplexMessagesTest;
 import 'dart:isolate';
-import '../../pkg/unittest/lib/unittest.dart';
+import 'package:unittest/unittest.dart';
+import "remote_unittest_helper.dart";
 
-main() {
+void main([args, port]) {
+  if (testRemote(main, port)) return;
   test("complex messages are serialized correctly", () {
     ReceivePort local = new ReceivePort();
     Isolate.spawn(logMessages, local.sendPort);
     var done = expectAsync0((){});
     local.listen(expectAsync1((msg) {
       switch (msg[0]) {
         case "init":
           var remote = msg[1];
           remote.send(1);
           remote.send("Hello");
@@ skipping 53 matching lines @@
           expect(message.length, 3);
           expect(message[0], "Hello");
           expect(message[1], "World");
           expect(message[2], 0xffffffffff);
           break;
       }
       count++;
     }
   });
 }