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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/timer/hi_res_timer_manager.h"
      6 
      7 #include "base/power_monitor/power_monitor.h"
      8 #include "base/time/time.h"
      9 
     10 namespace base {
     11 
     12 HighResolutionTimerManager::HighResolutionTimerManager()
     13     : hi_res_clock_available_(false) {
     14   base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
     15   DCHECK(power_monitor != NULL);
     16   power_monitor->AddObserver(this);
     17   UseHiResClock(!power_monitor->IsOnBatteryPower());
     18 }
     19 
     20 HighResolutionTimerManager::~HighResolutionTimerManager() {
     21   base::PowerMonitor::Get()->RemoveObserver(this);
     22   UseHiResClock(false);
     23 }
     24 
     25 void HighResolutionTimerManager::OnPowerStateChange(bool on_battery_power) {
     26   UseHiResClock(!on_battery_power);
     27 }
     28 
     29 void HighResolutionTimerManager::UseHiResClock(bool use) {
     30   if (use == hi_res_clock_available_)
     31     return;
     32   hi_res_clock_available_ = use;
     33   base::Time::EnableHighResolutionTimer(use);
     34 }
     35 
     36 }  // namespace base
     37