Add support to Battery Status API in blink.

Source/modules/battery/BatteryManager.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.
+ */

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

Please use this license for new files:

http://dev.chromium.org/blink/coding-style#TOC-License

+
+#ifndef BatteryManager_h
+#define BatteryManager_h
+
+#include "core/dom/ActiveDOMObject.h"
+#include "core/events/EventTarget.h"
+#include "core/frame/Frame.h"
+#include "modules/battery/BatteryStatus.h"
+
+namespace WebCore {
+
+class Navigator;
+class ScriptExecutionContext;
+
+class BatteryManager : public ActiveDOMObject, public RefCounted<BatteryManager>, public EventTarget {
+public:
+    virtual ~BatteryManager();
+    static PassRefPtr<BatteryManager> create(Navigator*);
+    static PassRefPtr<BatteryManager> create(Frame*);

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

Why are there two create functions?  It seems like one create function should be
enough.

+
+    // EventTarget implementation.
+    virtual const WTF::AtomicString& interfaceName() const { return EventTargetNames::BatteryManager; }
+    virtual ExecutionContext* executionContext() const OVERRIDE FINAL { return ActiveDOMObject::executionContext(); }
+
+    bool charging();
+    double chargingTime();
+    double dischargingTime();
+    double level();
+
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(chargingchange);
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(chargingtimechange);
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(dischargingtimechange);
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(levelchange);
+
+    void didChangeBatteryStatus(PassRefPtr<Event>, PassRefPtr<BatteryStatus>);
+
+    using RefCounted<BatteryManager>::ref;
+    using RefCounted<BatteryManager>::deref;
+
+    // ActiveDOMObject implementation.
+    virtual bool canSuspend() const { return true; }
+    virtual void suspend() OVERRIDE;
+    virtual void resume() OVERRIDE;
+    virtual void stop() OVERRIDE;
+
+protected:
+    virtual EventTargetData* eventTargetData() { return &m_eventTargetData; }
+    virtual EventTargetData& ensureEventTargetData() { return m_eventTargetData; }
+
+private:
+    explicit BatteryManager(Navigator*);
+    explicit BatteryManager(Frame*);
+
+    // EventTarget implementation.
+    virtual void refEventTarget() { ref(); }
+    virtual void derefEventTarget() { deref(); }
+
+    EventTargetData m_eventTargetData;
+    RefPtr<BatteryStatus> m_batteryStatus;
+};
+
+}
+
+#endif // BatteryManager_h
+