diff -r 000000000000 -r 6474c204b198 widget/windows/nsScreenManagerWin.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/windows/nsScreenManagerWin.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,50 @@
+/* -*- 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 nsScreenManagerWin_h___
+#define nsScreenManagerWin_h___
+
+#include "nsIScreenManager.h"
+
+#include <windows.h>
+#include "nsCOMPtr.h"
+#include "nsTArray.h"
+#include "mozilla/Attributes.h"
+
+class nsIScreen;
+
+//------------------------------------------------------------------------
+
+class ScreenListItem
+{
+public:
+  ScreenListItem ( HMONITOR inMon, nsIScreen* inScreen )
+    : mMon(inMon), mScreen(inScreen) { } ;
+  
+  HMONITOR mMon;
+  nsCOMPtr<nsIScreen> mScreen;
+};
+
+class nsScreenManagerWin MOZ_FINAL : public nsIScreenManager
+{
+public:
+  nsScreenManagerWin ( );
+  ~nsScreenManagerWin();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISCREENMANAGER
+
+private:
+
+  nsIScreen* CreateNewScreenObject ( HMONITOR inScreen ) ;
+
+  uint32_t mNumberOfScreens;
+
+    // cache the screens to avoid the memory allocations
+  nsAutoTArray<ScreenListItem, 8> mScreenList;
+
+};
+
+#endif  // nsScreenManagerWin_h___