diff -r 000000000000 -r 6474c204b198 dom/workers/test/content_worker.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/content_worker.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+var props = {
+  'ctypes': 1,
+  'OS': 1
+};
+for (var prop in props) {
+  postMessage({ "prop": prop, "value": self[prop] });
+}
+postMessage({ "testfinished": 1 });