Convert most of the javascript isolate code into Dart, inject JS code only when

frog/lib/isolate_serialization.dart

 // Copyright (c) 2011, 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.
 
 /**
  * Abstract visitor for dart objects that can be passed as messages between any
  * isolates.
  */
 class MessageTraverser {
   static bool isPrimitive(x) {
@@ skipping 99 matching lines @@
     return copy;
   }
 
   SendPort visitSendPort(SendPortImpl port) {
     return new SendPortImpl(port._workerId,
                             port._isolateId,
                             port._receivePortId);
   }
 
   SendPort visitReceivePort(ReceivePortImpl port) {
-    return port._toNewSendPort();
+    return port.toSendPort();
   }
 
   SendPort visitReceivePortSingleShot(ReceivePortSingleShotImpl port) {
-    return port._toNewSendPort();
+    return port.toSendPort();
   }
 }
 
 /** Visitor that serializes a message as a JSON array. */
 class Serializer extends MessageTraverser {
   Serializer() : super();
 
   visitPrimitive(x) => x;
 
   visitList(List list) {
@@ skipping 109 matching lines @@
   SendPort _deserializeSendPort(List x) {
     int workerId = x[1];
     int isolateId = x[2];
     int receivePortId = x[3];
     return new SendPortImpl(workerId, isolateId, receivePortId);
   }
 
   // TODO(floitsch): this should by Map<int, var> or Map<int, Dynamic>.
   Map<int, Dynamic> _deserialized;
 }