diff -r 000000000000 -r 6474c204b198 dom/base/nsIGlobalObject.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/base/nsIGlobalObject.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsIGlobalObject_h__
+#define nsIGlobalObject_h__
+
+#include "nsISupports.h"
+#include "js/TypeDecls.h"
+
+#define NS_IGLOBALOBJECT_IID \
+{ 0xe2538ded, 0x13ef, 0x4f4d, \
+{ 0x94, 0x6b, 0x65, 0xd3, 0x33, 0xb4, 0xf0, 0x3c } }
+
+class nsIPrincipal;
+
+class nsIGlobalObject : public nsISupports
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IGLOBALOBJECT_IID)
+
+  virtual JSObject* GetGlobalJSObject() = 0;
+
+  // This method is not meant to be overridden.
+  nsIPrincipal* PrincipalOrNull();
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIGlobalObject,
+                              NS_IGLOBALOBJECT_IID)
+
+#endif // nsIGlobalObject_h__