SystemMonitor refactoring: move power state monitor into a separate class called PowerMonitor

base/system_monitor/system_monitor_win.cc

-// 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 "base/system_monitor/system_monitor.h"
-
-namespace base {
-
-void SystemMonitor::ProcessWmPowerBroadcastMessage(int event_id) {
-  PowerEvent power_event;
-  switch (event_id) {
-    case PBT_APMPOWERSTATUSCHANGE:  // The power status changed.
-      power_event = POWER_STATE_EVENT;
-      break;
-    case PBT_APMRESUMEAUTOMATIC:  // Resume from suspend.
-    //case PBT_APMRESUMESUSPEND:  // User-initiated resume from suspend.
-                                  // We don't notify for this latter event
-                                  // because if it occurs it is always sent as a
-                                  // second event after PBT_APMRESUMEAUTOMATIC.
-      power_event = RESUME_EVENT;
-      break;
-    case PBT_APMSUSPEND:  // System has been suspended.
-      power_event = SUSPEND_EVENT;
-      break;
-    default:
-      return;
-
-    // Other Power Events:
-    // PBT_APMBATTERYLOW - removed in Vista.
-    // PBT_APMOEMEVENT - removed in Vista.
-    // PBT_APMQUERYSUSPEND - removed in Vista.
-    // PBT_APMQUERYSUSPENDFAILED - removed in Vista.
-    // PBT_APMRESUMECRITICAL - removed in Vista.
-    // PBT_POWERSETTINGCHANGE - user changed the power settings.
-  }
-  ProcessPowerMessage(power_event);
-}
-
-// Function to query the system to see if it is currently running on
-// battery power.  Returns true if running on battery.
-bool SystemMonitor::IsBatteryPower() {
-  SYSTEM_POWER_STATUS status;
-  if (!GetSystemPowerStatus(&status)) {
-    DLOG(ERROR) << "GetSystemPowerStatus failed: " << GetLastError();
-    return false;
-  }
-  return (status.ACLineStatus == 0);
-}
-
-}  // namespace base