diff -r 000000000000 -r 6474c204b198 embedding/components/windowwatcher/src/nsAutoWindowStateHelper.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/embedding/components/windowwatcher/src/nsAutoWindowStateHelper.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+/* -*- 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 __nsAutoWindowStateHelper_h
+#define __nsAutoWindowStateHelper_h
+
+#include "nsCOMPtr.h"
+#include "nsPIDOMWindow.h"
+
+/**
+ * Helper class for dealing with notifications around opening modal
+ * windows.
+ */
+
+class nsPIDOMWindow;
+
+class nsAutoWindowStateHelper
+{
+public:
+  nsAutoWindowStateHelper(nsPIDOMWindow *aWindow);
+  ~nsAutoWindowStateHelper();
+
+  bool DefaultEnabled()
+  {
+    return mDefaultEnabled;
+  }
+
+protected:
+  bool DispatchEventToChrome(const char *aEventName);
+
+  nsCOMPtr<nsPIDOMWindow> mWindow;
+  bool mDefaultEnabled;
+};
+
+
+#endif