diff -r 000000000000 -r 6474c204b198 widget/windows/nsIdleServiceWin.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/windows/nsIdleServiceWin.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim:expandtab:shiftwidth=4:tabstop=4:
+ */
+/* 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 nsIdleServiceWin_h__
+#define nsIdleServiceWin_h__
+
+#include "nsIdleService.h"
+
+
+/* NOTE: Compare of GetTickCount() could overflow.  This corrects for
+* overflow situations.
+***/
+#ifndef SAFE_COMPARE_EVEN_WITH_WRAPPING
+#define SAFE_COMPARE_EVEN_WITH_WRAPPING(A, B) (((int)((long)A - (long)B) & 0xFFFFFFFF))
+#endif
+
+
+class nsIdleServiceWin : public nsIdleService
+{
+public:
+    NS_DECL_ISUPPORTS_INHERITED
+
+    bool PollIdleTime(uint32_t* aIdleTime);
+
+    static already_AddRefed<nsIdleServiceWin> GetInstance()
+    {
+        nsRefPtr<nsIdleServiceWin> idleService =
+            nsIdleService::GetInstance().downcast<nsIdleServiceWin>();
+        if (!idleService) {
+            idleService = new nsIdleServiceWin();
+        }
+        
+        return idleService.forget();
+    }
+
+protected:
+    nsIdleServiceWin() { }
+    virtual ~nsIdleServiceWin() { }
+    bool UsePollMode();
+};
+
+#endif // nsIdleServiceWin_h__