diff -r 000000000000 -r 6474c204b198 dom/tests/mochitest/localstorage/interOriginTest.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/tests/mochitest/localstorage/interOriginTest.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+var slaveLoadsPending = 1;
+
+var slaveOrigin = "";
+var slave = null;
+
+var failureRegExp = new RegExp("^FAILURE");
+const slavePath = "/tests/dom/tests/mochitest/localstorage/";
+
+window.addEventListener("message", onMessageReceived, false);
+
+function onMessageReceived(event)
+{
+  switch (event.data)
+  {
+    // Indication of the frame onload event
+    case "frame loaded":
+      if (--slaveLoadsPending)
+        break;
+
+      // Just fall through...
+
+    // Indication of successfully finished step of a test
+    case "perf":
+      if (event.data == "perf")
+        doStep();
+
+      slave.postMessage("step", slaveOrigin);
+      break;
+
+    // Indication of all test parts finish (from any of the frames)
+    case "done":
+      localStorage.clear();
+      slaveLoadsPending = 1;
+      doNextTest();
+      break;
+
+    // Any other message indicates error or succes message of a test
+    default:
+      SimpleTest.ok(!event.data.match(failureRegExp), event.data);
+      break;
+  }
+}