diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/idle_timer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/idle_timer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,97 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// IdleTimer is a recurring Timer which runs only when the system is idle.
+// System Idle time is defined as not having any user keyboard or mouse
+// activity for some period of time.  Because the timer is user dependant, it
+// is possible for the timer to never fire.
+//
+// Usage should be for low-priority work, and may look like this:
+//
+//   class MyIdleTimer : public IdleTimer {
+//    public:
+//     // This timer will run repeatedly after 5 seconds of idle time
+//     MyIdleTimer() : IdleTimer(TimeDelta::FromSeconds(5), true) {};
+//     virtual void OnIdle() { do something };
+//   }
+//
+//   MyIdleTimer *timer = new MyIdleTimer();
+//   timer->Start();
+//
+//   // As with all Timers, the caller must dispose the object.
+//   delete timer;  // Will Stop the timer and cleanup.
+//
+// NOTE: An IdleTimer can only be used on a thread that processes UI events.
+// Such a thread should be running a MessageLoopForUI.
+
+#ifndef BASE_IDLE_TIMER_H_
+#define BASE_IDLE_TIMER_H_
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
+#include "base/basictypes.h"
+#include "base/task.h"
+#include "base/timer.h"
+
+namespace base {
+
+// Function prototype - Get the number of milliseconds that the user has been
+// idle.
+typedef bool (*IdleTimeSource)(int32_t *milliseconds_interval_since_last_event);
+
+class IdleTimer {
+ public:
+  // Create an IdleTimer.
+  // idle_time: idle time required before this timer can run.
+  // repeat: true if the timer should fire multiple times per idle,
+  //         false to fire once per idle.
+  IdleTimer(TimeDelta idle_time, bool repeat);
+
+  // On destruction, the IdleTimer will Stop itself.
+  virtual ~IdleTimer();
+
+  // Start the IdleTimer.
+  void Start();
+
+  // Stop the IdleTimer.
+  void Stop();
+
+  // The method to run when the timer elapses.
+  virtual void OnIdle() = 0;
+
+ protected:
+  // Override the IdleTimeSource.
+  void set_idle_time_source(IdleTimeSource idle_time_source) {
+    idle_time_source_ = idle_time_source;
+  }
+
+ private:
+  // Called when timer_ expires.
+  void Run();
+
+  // Start the timer.
+  void StartTimer();
+
+  // Gets the number of milliseconds since the last input event.
+  TimeDelta CurrentIdleTime();
+
+  // Compute time until idle.  Returns 0 if we are now idle.
+  TimeDelta TimeUntilIdle();
+
+  TimeDelta idle_interval_;
+  bool repeat_;
+  Time last_time_fired_;  // The last time the idle timer fired.
+                          // will be 0 until the timer fires the first time.
+  OneShotTimer<IdleTimer> timer_;
+
+  IdleTimeSource idle_time_source_;
+
+  DISALLOW_COPY_AND_ASSIGN(IdleTimer);
+};
+
+}  // namespace base
+
+#endif  // BASE_IDLE_TIMER_H_