Add setBatteryListener into Platform.

public/platform/WebBatteryStatus.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 WebBatteryStatus_h
 #define WebBatteryStatus_h
 
+#include <limits>
+
 namespace blink {
 
 class WebBatteryStatus {
 public:
     WebBatteryStatus()
         : charging(true)
         , chargingTime(0.0)
         , dischargingTime(std::numeric_limits<double>::infinity())
         , level(1.0)
     {
     }
 
     bool charging;
     double chargingTime;
     double dischargingTime;
     double level;
 };
 
 } // namespace blink
 
 #endif // WebBatteryStatus_h