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

base/power_monitor/power_monitor_source.cc

Index: base/power_monitor/power_monitor_source.cc
diff --git a/base/power_monitor/power_monitor_source.cc b/base/power_monitor/power_monitor_source.cc
index 6868cb19e338e17b7d5c960b606b8f22845893da..5d27a0e5a07b0513f412df7a0a098003e73192c8 100644
--- a/base/power_monitor/power_monitor_source.cc
+++ b/base/power_monitor/power_monitor_source.cc
@@ -5,16 +5,12 @@
 #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_);
@@ -63,4 +59,11 @@ void PowerMonitorSource::ProcessPowerEvent(PowerEvent event_id) {
   }
 }
 
+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