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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/hi_res_timer_manager.h" | |
6 | |
7 #include "base/power_monitor/power_monitor.h" | |
8 #include "base/time.h" | |
9 | |
10 HighResolutionTimerManager::HighResolutionTimerManager() | |
11 : hi_res_clock_available_(false) { | |
12 base::PowerMonitor* power_monitor = base::PowerMonitor::Get(); | |
13 power_monitor->AddObserver(this); | |
14 UseHiResClock(!power_monitor->BatteryPower()); | |
15 } | |
16 | |
17 HighResolutionTimerManager::~HighResolutionTimerManager() { | |
18 base::PowerMonitor::Get()->RemoveObserver(this); | |
19 UseHiResClock(false); | |
20 } | |
21 | |
22 void HighResolutionTimerManager::OnPowerStateChange(bool on_battery_power) { | |
23 UseHiResClock(!on_battery_power); | |
24 } | |
25 | |
26 void HighResolutionTimerManager::UseHiResClock(bool use) { | |
27 if (use == hi_res_clock_available_) | |
28 return; | |
29 hi_res_clock_available_ = use; | |
30 base::Time::EnableHighResolutionTimer(use); | |
31 } | |
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