Implement base::PowerMonitor::IsOnBatteryPower() for OSX.

base/power_monitor/power_monitor_source.cc

 // Copyright 2013 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/power_monitor/power_monitor_source.h"
 
 #include "base/power_monitor/power_monitor.h"
+#include "build/build_config.h"
 
 namespace base {
 
-PowerMonitorSource::PowerMonitorSource()
-    : on_battery_power_(false),
-      suspended_(false) {
-}
-
-PowerMonitorSource::~PowerMonitorSource() {
-}
+PowerMonitorSource::PowerMonitorSource() {}
+PowerMonitorSource::~PowerMonitorSource() {}
 
 bool PowerMonitorSource::IsOnBatteryPower() {
   AutoLock auto_lock(battery_lock_);
   return on_battery_power_;
 }
 
 void PowerMonitorSource::ProcessPowerEvent(PowerEvent event_id) {
   PowerMonitor* monitor = PowerMonitor::Get();
   if (!monitor)
     return;
@@ skipping 28 matching lines @@
       break;
     case SUSPEND_EVENT:
       if (!source->suspended_) {
         source->suspended_ = true;
         monitor->NotifySuspend();
       }
       break;
   }
 }
 
+void PowerMonitorSource::SetInitialOnBatteryPowerState(bool on_battery_power) {
+  // Must only be called before a monitor exists, otherwise the caller should
+  // have just used a normal ProcessPowerEvent(POWER_STATE_EVENT) call.
+  DCHECK(!PowerMonitor::Get());
+  on_battery_power_ = on_battery_power;
+}
+
 }  // namespace base