Add support to Battery Status API in blink.

Source/modules/battery/NavigatorBattery.cpp

Index: Source/modules/battery/NavigatorBattery.cpp
diff --git a/Source/modules/battery/NavigatorBattery.cpp b/Source/modules/battery/NavigatorBattery.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..09eea150dc3be68f6f444609d4236279f94ff816
--- /dev/null
+++ b/Source/modules/battery/NavigatorBattery.cpp
@@ -0,0 +1,56 @@
+// 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/NavigatorBattery.h"
+
+#include "core/dom/ExecutionContext.h"

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

This header does not appear to be used by this file.  Please remove it.

+#include "core/frame/Navigator.h"

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

You've already included this header in the NavigatorBattery.h.  No need to
include it again.

+#include "modules/battery/BatteryManager.h"
+
+namespace WebCore {
+
+NavigatorBattery::NavigatorBattery(Frame* frame)
+    : DOMWindowProperty(frame)
+{
+}
+
+NavigatorBattery::~NavigatorBattery()
+{
+}
+
+BatteryManager* NavigatorBattery::battery(Navigator& navigator)
+{
+    return NavigatorBattery::from(navigator).battery();

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

Notice that you can pass navigator as the argument to battery() here and avoid
having to be a DOMWindowProperty.

+}
+
+BatteryManager* NavigatorBattery::battery()
+{
+    if (!m_batteryManager && frame())
+        m_batteryManager = BatteryManager::create(frame());
+    return m_batteryManager.get();
+}
+
+const char* NavigatorBattery::supplementName()
+{
+    return "NavigatorBattery";
+}
+
+NavigatorBattery& NavigatorBattery::from(Navigator& navigator)
+{
+    NavigatorBattery* supplement = static_cast<NavigatorBattery*>(Supplement<Navigator>::from(navigator, supplementName()));
+    if (!supplement) {
+        supplement = new NavigatorBattery(navigator.frame());
+        provideTo(navigator, supplementName(), adoptPtr(supplement));
+    }
+    return *supplement;
+}
+
+BatteryManager* NavigatorBattery::batteryManager()
+{
+    return m_batteryManager.get();
+}

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

This function does not appear to be necessary.  Please remove it.

+
+} // namespace WebCore
+