Add support to Battery Status API in blink.

Source/modules/battery/BatteryStatus.h

+/*
+ *  Copyright (C) 2012 Samsung Electronics
+ *  Copyright (C) 2014 Intel Corporation
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ */
+
+#ifndef BatteryStatus_h
+#define BatteryStatus_h
+
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefCounted.h"
+
+namespace WebCore {
+
+class BatteryStatus : public RefCounted<BatteryStatus> {

[abarth-chromium, 2014/02/27 05:42:09]

Why is this object RefCounted?  It looks like there's only ever one reference. 
We should use OwnPtr rather than RefPtr.

+public:
+    static PassRefPtr<BatteryStatus> create();
+    static PassRefPtr<BatteryStatus> create(bool charging, double chargingTime, double dischargingTime, double level);
+
+    bool charging() const { return m_charging; }
+    double chargingTime() const  { return m_chargingTime; }
+    double dischargingTime() const  { return m_dischargingTime; }
+    double level() const  { return m_level; }
+
+private:
+    BatteryStatus();
+    BatteryStatus(bool charging, double chargingTime, double dischargingTime, double level);
+
+    bool m_charging;
+    double m_chargingTime;
+    double m_dischargingTime;
+    double m_level;
+};
+
+} // namespace WebCore
+
+#endif // BatteryStatus_h
+