diff -r 000000000000 -r 6474c204b198 widget/gtk/nsScreenManagerGtk.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/gtk/nsScreenManagerGtk.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+/* -*- 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 nsScreenManagerGtk_h___
+#define nsScreenManagerGtk_h___
+
+#include "nsIScreenManager.h"
+#include "nsIScreen.h"
+#include "nsCOMPtr.h"
+#include "nsCOMArray.h"
+#include "prlink.h"
+#include "gdk/gdk.h"
+#ifdef MOZ_X11
+#include <X11/Xlib.h>
+#endif
+
+//------------------------------------------------------------------------
+
+class nsScreenManagerGtk : public nsIScreenManager
+{
+public:
+  nsScreenManagerGtk ( );
+  virtual ~nsScreenManagerGtk();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISCREENMANAGER
+
+#ifdef MOZ_X11
+  Atom NetWorkareaAtom() { return mNetWorkareaAtom; }
+#endif
+  
+  // For internal use, or reinitialization from change notification.
+  nsresult Init();
+
+private:
+
+  nsresult EnsureInit();
+
+  // Cached screen array.  Its length is the number of screens we have.
+  nsCOMArray<nsIScreen> mCachedScreenArray;
+
+  PRLibrary *mXineramalib;
+
+  GdkWindow *mRootWindow;
+#ifdef MOZ_X11
+  Atom mNetWorkareaAtom;
+#endif
+};
+
+#endif  // nsScreenManagerGtk_h___