Add RawReceivePort to dart2js.

sdk/lib/isolate/isolate.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.
 
 /**
  * Concurrent programming using _isolates_:
  * independent workers that are similar to threads
  * but don't share memory,
  * communicating only via messages.
  *
@@ skipping 160 matching lines @@
    * Closes `this`.
    *
    * If the stream has not been canceled yet, adds a close-event to the event
    * queue and discards any further incoming messages.
    *
    * If the stream has already been canceled this method has no effect.
    */
   void close();
 
   /**
-   * Returns a send port that sends to this receive port.
+   * Returns a [SendPort] that sends to this receive port.
    */
   SendPort get sendPort;
 }
 
 abstract class RawReceivePort {
   /**
    * Opens a long-lived port for receiving messages.
    *
    * A [RawReceivePort] is low level and does not work with [Zone]s. It
    * can not be paused. The data-handler must be set before the first
    * event is received.
    */
   external factory RawReceivePort([void handler(event)]);
 
   /**
    * Sets the handler that is invoked for every incoming message.
    *
    * The handler is invoked in the root-zone ([Zone.ROOT]).
    */
   void set handler(Function newHandler);
 
   /**
    * Closes the port.
    *
    * After a call to this method any incoming message is silently dropped.
    */
   void close();
+
+  /**
+   * Returns a [SendPort] that sends to this receive port.
+   */
+  SendPort get sendPort;
 }
 
 /**
  * Wraps unhandled exceptions thrown during isolate execution. It is
  * used to show both the error message and the stack trace for unhandled
  * exceptions.
  */
 // TODO(floitsch): probably going to remove and replace with something else.
 class _IsolateUnhandledException implements Exception {
   /** Message being handled when exception occurred. */
   final message;
 
   /** Wrapped exception. */
   final source;
 
   /** Trace for the wrapped exception. */
   final StackTrace stackTrace;
 
   const _IsolateUnhandledException(this.message, this.source, this.stackTrace);
 
   String toString() {
     return 'IsolateUnhandledException: exception while handling message: '
         '${message} \n  '
         '${source.toString().replaceAll("\n", "\n  ")}\n'
         'original stack trace:\n  '
         '${stackTrace.toString().replaceAll("\n","\n  ")}';
   }
 }