diff -r 000000000000 -r 6474c204b198 dom/bindings/AtomList.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/bindings/AtomList.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_AtomList_h
+#define mozilla_dom_AtomList_h
+
+#include "jsapi.h"
+#include "mozilla/dom/GeneratedAtomList.h"
+
+namespace mozilla {
+namespace dom {
+
+template<class T>
+T* GetAtomCache(JSContext* aCx)
+{
+  JSRuntime* rt = JS_GetRuntime(aCx);
+
+  auto atomCache = static_cast<PerThreadAtomCache*>(JS_GetRuntimePrivate(rt));
+
+  return static_cast<T*>(atomCache);
+}
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_AtomList_h