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-rw-r--r--chrome/common/hi_res_timer_manager_win.cc29
1 files changed, 29 insertions, 0 deletions
diff --git a/chrome/common/hi_res_timer_manager_win.cc b/chrome/common/hi_res_timer_manager_win.cc
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+++ b/chrome/common/hi_res_timer_manager_win.cc
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+// Copyright (c) 2011 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.
+
+#include "chrome/common/hi_res_timer_manager.h"
+
+#include "base/time.h"
+
+HighResolutionTimerManager::HighResolutionTimerManager()
+ : hi_res_clock_used_(false) {
+ ui::SystemMonitor* system_monitor = ui::SystemMonitor::Get();
+ system_monitor->AddObserver(this);
+ UseHiResClock(!system_monitor->BatteryPower());
+}
+
+HighResolutionTimerManager::~HighResolutionTimerManager() {
+ ui::SystemMonitor::Get()->RemoveObserver(this);
+ UseHiResClock(false);
+}
+
+void HighResolutionTimerManager::OnPowerStateChange(bool on_battery_power) {
+ UseHiResClock(!on_battery_power);
+}
+
+void HighResolutionTimerManager::UseHiResClock(bool use) {
+ if (use == hi_res_clock_used_)
+ return;
+ base::Time::EnableHighResolutionTimer(use);
+}