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diff --git a/widget/nsUserIdleService.h b/widget/nsUserIdleService.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=2:tabstop=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 nsUserIdleService_h__
+#define nsUserIdleService_h__
+
+#include "nsIUserIdleServiceInternal.h"
+#include "nsCOMPtr.h"
+#include "nsITimer.h"
+#include "nsTArray.h"
+#include "nsIObserver.h"
+#include "nsIUserIdleService.h"
+#include "nsCategoryCache.h"
+#include "nsWeakReference.h"
+#include "mozilla/TimeStamp.h"
+
+/**
+ * Class we can use to store an observer with its associated idle time
+ * requirement and whether or not the observer thinks it's "idle".
+ */
+class IdleListener {
+ public:
+ nsCOMPtr<nsIObserver> observer;
+ uint32_t reqIdleTime;
+ bool isIdle;
+
+ IdleListener(nsIObserver* obs, uint32_t reqIT, bool aIsIdle = false)
+ : observer(obs), reqIdleTime(reqIT), isIdle(aIsIdle) {}
+ ~IdleListener() = default;
+};
+
+// This one will be declared later.
+class nsUserIdleService;
+
+/**
+ * Class to handle the daily idle timer.
+ */
+class nsUserIdleServiceDaily : public nsIObserver,
+ public nsSupportsWeakReference {
+ public:
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIOBSERVER
+
+ explicit nsUserIdleServiceDaily(nsIUserIdleService* aIdleService);
+
+ /**
+ * Initializes the daily idle observer.
+ * Keep this separated from the constructor, since it could cause pointer
+ * corruption due to AddRef/Release of "this".
+ */
+ void Init();
+
+ private:
+ virtual ~nsUserIdleServiceDaily();
+
+ /**
+ * StageIdleDaily is the interim call made when an idle-daily event is due.
+ * However we don't want to fire idle-daily until the user is idle for this
+ * session, so this sets up a short wait for an idle event which triggers
+ * the actual idle-daily event.
+ *
+ * @param aHasBeenLongWait Pass true indicating nsUserIdleServiceDaily is
+ * having trouble getting the idle-daily event fired. If true StageIdleDaily
+ * will use a shorter idle wait time before firing idle-daily.
+ */
+ void StageIdleDaily(bool aHasBeenLongWait);
+
+ /**
+ * @note This is a normal pointer, part to avoid creating a cycle with the
+ * idle service, part to avoid potential pointer corruption due to this class
+ * being instantiated in the constructor of the service itself.
+ */
+ nsIUserIdleService* mIdleService;
+
+ /**
+ * Place to hold the timer used by this class to determine when a day has
+ * passed, after that it will wait for idle time to be detected.
+ */
+ nsCOMPtr<nsITimer> mTimer;
+
+ /**
+ * Function that is called back once a day.
+ */
+ static void DailyCallback(nsITimer* aTimer, void* aClosure);
+
+ /**
+ * Cache of observers for the "idle-daily" category.
+ */
+ nsCategoryCache<nsIObserver> mCategoryObservers;
+
+ /**
+ * Next time we expect an idle-daily timer to fire, in case timers aren't
+ * very reliable on the platform. Value is in PR_Now microsecond units.
+ */
+ PRTime mExpectedTriggerTime;
+
+ /**
+ * Tracks which idle daily observer callback we ask for. There are two: a
+ * regular long idle wait and a shorter wait if we've been waiting to fire
+ * idle daily for an extended period. Set by StageIdleDaily.
+ */
+ int32_t mIdleDailyTriggerWait;
+};
+
+class nsUserIdleService : public nsIUserIdleServiceInternal {
+ public:
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIUSERIDLESERVICE NS_DECL_NSIUSERIDLESERVICEINTERNAL
+
+ protected : static already_AddRefed<nsUserIdleService>
+ GetInstance();
+
+ nsUserIdleService();
+ virtual ~nsUserIdleService();
+
+ /**
+ * If there is a platform specific function to poll the system idel time
+ * then that must be returned in this function, and the function MUST return
+ * true, otherwise then the function should be left unimplemented or made
+ * to return false (this can also be used for systems where it depends on
+ * the configuration of the system if the idle time can be determined)
+ *
+ * @param aIdleTime
+ * The idle time in ms.
+ *
+ * @return true if the idle time could be polled, false otherwise.
+ *
+ * @note The time returned by this function can be different than the one
+ * returned by GetIdleTime, as that is corrected by any calls to
+ * ResetIdleTimeOut(), unless you overwrite that function too...
+ */
+ virtual bool PollIdleTime(uint32_t* aIdleTime);
+
+ public:
+ void SetDisabledForShutdown();
+
+ private:
+ /**
+ * Ensure that the timer is expiring at least at the given time
+ *
+ * The function might not restart the timer if there is one running currently
+ *
+ * @param aNextTimeout
+ * The last absolute time the timer should expire
+ */
+ void SetTimerExpiryIfBefore(mozilla::TimeStamp aNextTimeout);
+
+ /**
+ * Stores the next timeout time, 0 means timer not running
+ */
+ mozilla::TimeStamp mCurrentlySetToTimeoutAt;
+
+ /**
+ * mTimer holds the internal timer used by this class to detect when to poll
+ * for idle time, when to check if idle timers should expire etc.
+ */
+ nsCOMPtr<nsITimer> mTimer;
+
+ /**
+ * Array of listeners that wants to be notified about idle time.
+ */
+ nsTArray<IdleListener> mArrayListeners;
+
+ /**
+ * Object keeping track of the daily idle thingy.
+ */
+ RefPtr<nsUserIdleServiceDaily> mDailyIdle;
+
+ /**
+ * Number of observers currently in idle mode.
+ */
+ uint32_t mIdleObserverCount;
+
+ /**
+ * Delta time from last non idle time to when the next observer should switch
+ * to idle mode
+ *
+ * Time in seconds
+ *
+ * If this value is 0 it means there are no active observers
+ */
+ uint32_t mDeltaToNextIdleSwitchInS;
+
+ /**
+ * If true, the idle service is temporarily disabled, and all idle events
+ * will be ignored.
+ */
+ bool mDisabled = false;
+
+ /**
+ * Absolute value for when the last user interaction took place.
+ */
+ mozilla::TimeStamp mLastUserInteraction;
+
+ /**
+ * Function that ensures the timer is running with at least the minimum time
+ * needed. It will kill the timer if there are no active observers.
+ */
+ void ReconfigureTimer(void);
+
+ /**
+ * Callback function that is called when the internal timer expires.
+ *
+ * This in turn calls the IdleTimerCallback that does the real processing
+ */
+ static void StaticIdleTimerCallback(nsITimer* aTimer, void* aClosure);
+
+ /**
+ * Function that handles when a timer has expired
+ */
+ void IdleTimerCallback(void);
+};
+
+#endif // nsUserIdleService_h__