Implement Isolate.pause in dart2js.

tests/isolate/pause_test.dart

 // Copyright (c) 2014, 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.
 
 import "dart:isolate";
 import "dart:async";
 import "package:async_helper/async_helper.dart";
 
 isomain1(replyPort) {
   RawReceivePort port = new RawReceivePort();
   port.handler = (v) {
     replyPort.send(v);
     port.close();
   };
   replyPort.send(port.sendPort);
 }
 
 main(){
   asyncStart();
   RawReceivePort reply = new RawReceivePort();
   Isolate isolate;
   Capability resume;
   var completer = new Completer();  // Completed by first reply from isolate.
   reply.handler = completer.complete;
   Isolate.spawn(isomain1, reply.sendPort).then((Isolate iso) {
     isolate = iso;
-    resume = isolate.pause();
     return completer.future;
   }).then((echoPort) {
     // Isolate has been created, and first response has been returned.
+    resume = isolate.pause();
     echoPort.send(24);
     reply.handler = (v) {
       throw "RESPONSE WHILE PAUSED?!?";
     };
-    return new Future.delayed(const Duration(milliseconds: 250));
+    return new Future.delayed(const Duration(milliseconds: /*25*/0));

[floitsch, 2014/02/07 15:40:16]

on purpose?

[Lasse Reichstein Nielsen, 2014/02/10 08:41:26]

To make it run in d8 while testing.
Will remove now, and mark as failng in d8.

   }).then((_) {
     reply.handler = (v) {
       if (v != 24) throw "WRONG ANSWER!";
+      print("Success");

[floitsch, 2014/02/07 15:40:16]

debug?

[Lasse Reichstein Nielsen, 2014/02/10 08:41:26]

Done.

       reply.close();
       asyncEnd();
     };
     isolate.resume(resume);
   });
 }