diff -r 000000000000 -r 6474c204b198 dom/workers/Principal.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/workers/Principal.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,28 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* 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/. */
+
+#include "Principal.h"
+
+#include "jsapi.h"
+
+BEGIN_WORKERS_NAMESPACE
+
+JSPrincipals*
+GetWorkerPrincipal()
+{
+  static Atomic<bool> sInitialized(false);
+  static JSPrincipals sPrincipal;
+
+  bool isInitialized = sInitialized.exchange(true);
+  if (!isInitialized) {
+    sPrincipal.refcount = 1;
+#ifdef DEBUG
+    sPrincipal.debugToken = kJSPrincipalsDebugToken;
+#endif
+  }
+  return &sPrincipal;
+}
+
+END_WORKERS_NAMESPACE