diff -r 000000000000 -r 6474c204b198 dom/alarm/AlarmHalService.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/alarm/AlarmHalService.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* 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 mozilla_dom_alarm_AlarmHalService_h
+#define mozilla_dom_alarm_AlarmHalService_h
+
+#include "base/basictypes.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/Hal.h"
+#include "mozilla/Services.h"
+#include "nsIAlarmHalService.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+
+namespace mozilla {
+namespace dom {
+namespace alarm {
+  
+typedef Observer<void_t> AlarmObserver;
+typedef Observer<hal::SystemTimezoneChangeInformation> SystemTimezoneChangeObserver;
+
+class AlarmHalService : public nsIAlarmHalService, 
+                        public AlarmObserver,
+                        public SystemTimezoneChangeObserver
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIALARMHALSERVICE
+
+  void Init();
+  virtual ~AlarmHalService();
+
+  static already_AddRefed<AlarmHalService> GetInstance();
+
+  // Implementing hal::AlarmObserver
+  void Notify(const void_t& aVoid);
+
+  // Implementing hal::SystemTimezoneChangeObserver
+  void Notify(const hal::SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo);
+
+private:
+  bool mAlarmEnabled;
+  static StaticRefPtr<AlarmHalService> sSingleton;
+
+  nsCOMPtr<nsIAlarmFiredCb> mAlarmFiredCb;
+  nsCOMPtr<nsITimezoneChangedCb> mTimezoneChangedCb;
+};
+
+} // namespace alarm
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_alarm_AlarmHalService_h