diff -r 000000000000 -r 6474c204b198 layout/xul/nsRepeatService.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/nsRepeatService.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,60 @@
+/* -*- 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/. */
+
+//
+// nsRepeatService
+//
+#ifndef nsRepeatService_h__
+#define nsRepeatService_h__
+
+#include "nsCOMPtr.h"
+#include "nsITimer.h"
+
+#define INITAL_REPEAT_DELAY 250
+
+#ifdef XP_MACOSX
+#define REPEAT_DELAY        25
+#else
+#define REPEAT_DELAY        50
+#endif
+
+class nsITimer;
+
+class nsRepeatService : public nsITimerCallback
+{
+public:
+
+  typedef void (* Callback)(void* aData);
+    
+  NS_DECL_NSITIMERCALLBACK
+
+  // Start dispatching timer events to the callback. There is no memory
+  // management of aData here; it is the caller's responsibility to call
+  // Stop() before aData's memory is released.
+  void Start(Callback aCallback, void* aData,
+             uint32_t aInitialDelay = INITAL_REPEAT_DELAY);
+  // Stop dispatching timer events to the callback. If the repeat service
+  // is not currently configured with the given callback and data, this
+  // is just ignored.
+  void Stop(Callback aCallback, void* aData);
+
+  static nsRepeatService* GetInstance();
+  static void Shutdown();
+
+  NS_DECL_ISUPPORTS
+  virtual ~nsRepeatService();
+
+protected:
+  nsRepeatService();
+
+private:
+  Callback           mCallback;
+  void*              mCallbackData;
+  nsCOMPtr<nsITimer> mRepeatTimer;
+  static nsRepeatService* gInstance;
+
+}; // class nsRepeatService
+
+#endif