Add support to Battery Status API in blink.

Source/modules/battery/NavigatorBattery.h

+// 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.
+
+#ifndef NavigatorBattery_h
+#define NavigatorBattery_h
+
+#include "core/frame/Navigator.h"
+#include "platform/Supplementable.h"
+
+namespace WebCore {
+
+class BatteryManager;
+class Navigator;
+class ScriptExecutionContext;

[abarth-chromium, 2014/02/28 06:45:14]

This forward declaration doesn't appear to be used in this file.  Please remove
it.

+
+class NavigatorBattery : public Supplement<Navigator>, DOMWindowProperty {

[abarth-chromium, 2014/02/28 06:45:14]

Why does this class need to be a DOMWindowProperty?  That base class shouldn't
be needed.

+public:
+    virtual ~NavigatorBattery();
+
+    static NavigatorBattery& from(Navigator&);
+
+    static BatteryManager* battery(Navigator&);
+    BatteryManager* battery();
+
+    BatteryManager* batteryManager();

[abarth-chromium, 2014/02/28 06:45:14]

What's the difference between battery() and batteryManager() ?

+
+private:
+    NavigatorBattery(Frame*);

[abarth-chromium, 2014/02/28 06:45:14]

Please mark one-argument constructors explicit.

+    static const char* supplementName();
+
+    RefPtr<BatteryManager> m_batteryManager;
+};
+
+} // namespace WebCore
+
+#endif // NavigatorBattery_h
+
+

[abarth-chromium, 2014/02/28 06:45:14]

Please remove these extra blank lines at the end of this file.