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

tests/isolate/raw_port_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 RawReceivePort.
 
 library raw_port_test;
 import 'dart:isolate';
-import 'dart:async';
-import '../../pkg/unittest/lib/unittest.dart';
+import 'package:unittest/unittest.dart';
+import 'remote_unittest_helper.dart';
 
 
-void remote(SendPort port) { port.send("reply"); }
+void remote(SendPort port) {
+  port.send("reply");
+}
+
 void remote2(SendPort port) {
   port.send("reply 1");
   port.send("reply 2");
 }
 
-main() {
+main([args, port]) {
+  if (testRemote(main, port)) return;
+
   test("raw receive", () {
     RawReceivePort port = new RawReceivePort();
     Isolate.spawn(remote, port.sendPort);
     port.handler = expectAsync1((v) {
       expect(v, "reply");
       port.close();
     });
   });
+
   test("raw receive twice - change handler", () {
     RawReceivePort port = new RawReceivePort();
     Isolate.spawn(remote2, port.sendPort);
     port.handler = expectAsync1((v) {
       expect(v, "reply 1");
       port.handler = expectAsync1((v) {
         expect(v, "reply 2");
         port.close();
       });
     });
   });
+
   test("from-raw-port", () {
     RawReceivePort rawPort = new RawReceivePort();
     Isolate.spawn(remote, rawPort.sendPort);
     rawPort.handler = expectAsync1((v) {
       expect(v, "reply");
       ReceivePort port = new ReceivePort.fromRawReceivePort(rawPort);
       Isolate.spawn(remote, rawPort.sendPort);
       Isolate.spawn(remote, port.sendPort);
       int ctr = 2;
       port.listen(expectAsync1((v) {
                     expect(v, "reply");
                     ctr--;
                     if (ctr == 0) port.close();
                   }, count: 2),
                   onDone: expectAsync0((){}));
     });
   });
-
 }