diff -r 000000000000 -r 6474c204b198 js/xpconnect/src/BackstagePass.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/xpconnect/src/BackstagePass.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,60 @@
+/* -*- 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 BackstagePass_h__
+#define BackstagePass_h__
+
+#include "nsISupports.h"
+#include "nsWeakReference.h"
+#include "nsIGlobalObject.h"
+#include "nsIScriptObjectPrincipal.h"
+#include "nsIXPCScriptable.h"
+
+#include "js/HeapAPI.h"
+
+class BackstagePass : public nsIGlobalObject,
+                      public nsIScriptObjectPrincipal,
+                      public nsIXPCScriptable,
+                      public nsIClassInfo,
+                      public nsSupportsWeakReference
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIXPCSCRIPTABLE
+  NS_DECL_NSICLASSINFO
+
+  virtual nsIPrincipal* GetPrincipal() {
+    return mPrincipal;
+  }
+
+  virtual JSObject* GetGlobalJSObject() {
+    return mGlobal;
+  }
+
+  virtual void ForgetGlobalObject() {
+    mGlobal = nullptr;
+  }
+
+  virtual void SetGlobalObject(JSObject* global) {
+    mGlobal = global;
+  }
+
+  BackstagePass(nsIPrincipal *prin) :
+    mPrincipal(prin)
+  {
+  }
+
+  virtual ~BackstagePass() { }
+
+private:
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+  JS::TenuredHeap<JSObject*> mGlobal;
+};
+
+nsresult
+NS_NewBackstagePass(BackstagePass** ret);
+
+#endif // BackstagePass_h__