chromeos: Add support for the battery status API on chromeos.

chrome/browser/chromeos/battery_status_provider_chromeos.cc

+// Copyright (c) 2012 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/browser/chromeos/battery_status_provider_chromeos.h"
+
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "content/public/browser/battery_status_provider.h"
+#include "content/public/browser/power_supply_status.h"
+
+using namespace chromeos;
+
+BatteryStatusProviderChromeos* BatteryStatusProviderChromeos::GetInstance() {
+  return Singleton<BatteryStatusProviderChromeos>::get();
+}
+
+BatteryStatusProviderChromeos::BatteryStatusProviderChromeos() {
+  DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
+}
+
+BatteryStatusProviderChromeos::~BatteryStatusProviderChromeos() {
+  // By the time this singleton gets destroyed, the DBusThreadManager has
+  // already been destroyed. so do not remove the observer here.
+}
+
+void BatteryStatusProviderChromeos::PowerChanged(
+    const PowerSupplyStatus& status) {
+  content::PowerSupplyStatus content_status;
+  content_status.line_power_on = status.line_power_on;
+  content_status.battery_is_present = status.battery_is_present;
+  content_status.battery_is_full = status.battery_is_full;
+  content_status.battery_seconds_to_empty = status.battery_seconds_to_empty;
+  content_status.battery_seconds_to_full = status.battery_seconds_to_full;
+  content_status.battery_percentage = status.battery_percentage;
+  content_status.is_calculating_battery_time =
+      status.is_calculating_battery_time;
+  content::BatteryStatusProvider::GetInstance()->SendUpdate(content_status);
+}