Add support to Battery Status API in blink.

Source/modules/battery/BatteryStatus.cpp

+// Copyright 2014 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 "config.h"
+#include "modules/battery/BatteryStatus.h"
+
+#include <limits>
+
+namespace WebCore {
+
+PassOwnPtr<BatteryStatus> BatteryStatus::create()
+{
+    return adoptPtr(new BatteryStatus);
+}
+
+PassOwnPtr<BatteryStatus> BatteryStatus::create(bool charging, double chargingTime, double dischargingTime, double level)
+{
+    return adoptPtr(new BatteryStatus(charging, chargingTime, dischargingTime, level));
+}
+
+BatteryStatus::BatteryStatus()
+    : m_charging(true)
+    , m_chargingTime(0)
+    , m_dischargingTime(std::numeric_limits<double>::infinity())
+    , m_level(1)
+{
+}
+
+BatteryStatus::BatteryStatus(bool charging, double chargingTime, double dischargingTime, double level)
+    : m_charging(charging)
+    , m_chargingTime(chargingTime)
+    , m_dischargingTime(dischargingTime)
+    , m_level(level)
+{
+}
+
+} // namespace WebCore
+