Added Dartium support for JS to Dart PortSync calls

tests/html/js_interop_3_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
 
 #library('JsInterop3Test');
 #import('../../lib/unittest/unittest.dart');
 #import('../../lib/unittest/html_config.dart');
 #import('dart:html');
 #import('dart:isolate');
 
 injectSource(code) {
   final script = new ScriptElement();
   script.type = 'text/javascript';
   script.innerHTML = code;
   document.body.nodes.add(script);
 }
 
 var jsToDart = """
   var fun1 = window.lookupPort('fun1');
   var result = fun1.callSync({'a': 'Hello', 'b': 'World', c: 42});
 
   var fun2 = window.lookupPort('fun2');
   fun2.callSync(result);
 """;
 
 main() {
   useHtmlConfiguration();
 
   test('js-to-dart', () {
-    var done = expectAsync0(() {});
-
     var fun1 = (message) {
       Expect.equals('Hello', message['a']);
       Expect.equals('World', message['b']);
       Expect.equals(42, message['c']);
       Expect.equals(3, message.getKeys().length);
       return 42;
     };
 
     var port1 = new ReceivePortSync();
     port1.receive(fun1);
     window.registerPort('fun1', port1.toSendPort());
 
+    // TODO(vsm): Investigate why this needs to be called asynchronously.
+    var done = expectAsync0(() {});
     var fun2 = (message) {
       Expect.equals(42, message);
-
-      // TODO(vsm): Investigate why this needs to be called asynchronously.
       window.setTimeout(done, 0);
     };
 
     var port2 = new ReceivePortSync();
     port2.receive(fun2);
     window.registerPort('fun2', port2.toSendPort());
 
     injectSource(jsToDart);
   });
 }