Add support to Battery Status API in blink.

Source/modules/battery/BatteryManager.idl

 /*
  *  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.
  */
 
-partial interface Navigator {
-    // FIXME: The contents of the pattern argument should be clamped.
-    // See https://code.google.com/p/chromium/issues/detail?id=310138
-    boolean vibrate(sequence<unsigned long> pattern);
-    boolean vibrate([Clamp] unsigned long time);
+// http://dev.w3.org/2009/dap/system-info/battery-status.html
+[
+    NoInterfaceObject,
+    ActiveDOMObject,
+] interface BatteryManager : EventTarget {
+    readonly attribute boolean charging;
+    readonly attribute double chargingTime;
+    readonly attribute double dischargingTime;
+    readonly attribute double level;
+
+    attribute EventHandler onchargingchange;
+    attribute EventHandler onchargingtimechange;
+    attribute EventHandler ondischargingtimechange;
+    attribute EventHandler onlevelchange;
+
 };
+