I'm not exactly sure how to tell from chrome developer console if a worker is running but the generated javascript  shows a `new Worker`. The directions in this [post](http://blog.chromium.org/2012/04/debugging-web-workers-with-chrome.html) dont seem to work with the following example. Possible cause its not spawned from a URI?

```
$.IsolateNatives__spawnWorker = function(functionName, uri, replyPort) {
  var worker, t1, workerId;
  if (functionName == null)
    functionName = "main";
  if (uri == null)
    uri = $.get$IsolateNatives_thisScript();
  worker = new Worker(uri);
  worker.set$onmessage(function(e) { $.IsolateNatives__processWorkerMessage.call$2(worker, e); });
  t1 = $globalState;
  workerId = t1.nextManagerId;
  t1.nextManagerId = workerId + 1;
  worker.set$id(workerId);
  $.$$indexSet($globalState.managers, workerId, worker);
  worker.postMessage$1($._serializeMessage($.makeLiteralMap(["command", "start", "id", workerId, "replyTo", $._serializeMessage(replyPort), "functionName", functionName])));
};
```