diff -r 000000000000 -r 6474c204b198 dom/tests/mochitest/localstorage/localStorageCommon.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/tests/mochitest/localstorage/localStorageCommon.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+function localStorageFlush(cb)
+{
+  var ob = {
+    observe : function(sub, top, dat)
+    {
+      os().removeObserver(ob, "domstorage-test-flushed");
+      cb();
+    }
+  };
+  os().addObserver(ob, "domstorage-test-flushed", false);
+  notify("domstorage-test-flush-force");
+}
+
+function localStorageReload()
+{
+  notify("domstorage-test-reload");
+}
+
+function localStorageFlushAndReload(cb)
+{
+  localStorageFlush(function() {
+    localStorageReload();
+    cb();
+  });
+}
+
+function localStorageClearAll()
+{
+  os().notifyObservers(null, "cookie-changed", "cleared");
+}
+
+function localStorageClearDomain(domain)
+{
+  os().notifyObservers(null, "browser:purge-domain-data", domain);
+}
+
+function os()
+{
+  return SpecialPowers.Services.obs;
+}
+
+function notify(top)
+{
+  os().notifyObservers(null, top, null);
+}