diff -r 000000000000 -r 6474c204b198 dom/workers/test/close_worker.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/close_worker.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+onclose = function() {
+  postMessage("closed");
+  // Try to open a new worker.
+  try {
+    var worker = new Worker("close_worker.js");
+    throw new Error("We shouldn't get here!");
+  } catch (e) {
+    // pass
+  }
+};
+
+setTimeout(function () {
+  setTimeout(function () {
+    throw new Error("I should never run!");
+  }, 1000);
+  close();
+}, 1000);