diff -r 000000000000 -r 6474c204b198 dom/workers/test/dom_worker_helper.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/test/dom_worker_helper.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/
+ */
+
+var gRemainingTests = 0;
+
+function waitForWorkerFinish() {
+  if (gRemainingTests == 0) {
+    SimpleTest.waitForExplicitFinish();
+  }
+  ++gRemainingTests;
+}
+
+function finish() {
+  --gRemainingTests;
+  if (gRemainingTests == 0) {
+    SimpleTest.finish();
+  }
+}
+