diff -r 000000000000 -r 6474c204b198 dom/workers/test/chromeWorker_worker.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/chromeWorker_worker.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+if (!("ctypes" in self)) {
+  throw "No ctypes!";
+}
+
+// Go ahead and verify that the ctypes lazy getter actually works.
+if (ctypes.toString() != "[object ctypes]") {
+  throw "Bad ctypes object: " + ctypes.toString();
+}
+
+onmessage = function(event) {
+  let worker = new ChromeWorker("chromeWorker_subworker.js");
+  worker.onmessage = function(event) {
+    postMessage(event.data);
+  }
+  worker.postMessage(event.data);
+}