Creating Ui for Battery State Option in Chrome Os Emulator

chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h

 // Copyright 2015 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 CHROME_BROWSER_UI_WEBUI_CHROMEOS_EMULATOR_DEVICE_EMULATOR_MESSAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_EMULATOR_DEVICE_EMULATOR_MESSAGE_HANDLER_H_
 
 #include "chromeos/dbus/fake_power_manager_client.h"
 #include "chromeos/dbus/power_manager/power_supply_properties.pb.h"
 #include "content/public/browser/web_ui_message_handler.h"
@@ skipping 22 matching lines @@
 
   // Callback for the "requestBluetoothPair" message. This asynchronously
   // requests for the system to pair a certain device. The device's data should
   // be passed into |args| as a dictionary. If the device does not already
   // exist, then it will be created and attached to the main adapter.
   void HandleRequestBluetoothPair(const base::ListValue* args);
 
   // Callbacks for JS update methods. All these methods work
   // asynchronously.
   void UpdateBatteryPercent(const base::ListValue* args);
+  void UpdateBatteryState(const base::ListValue* args);
   void UpdateExternalPower(const base::ListValue* args);
   void UpdateTimeToEmpty(const base::ListValue* args);
   void UpdateTimeToFull(const base::ListValue* args);
 
   // Adds |this| as an observer to all necessary objects.
   void Init();
 
   // chromeos::PowerManagerClient::Observer:
   void PowerChanged(const power_manager::PowerSupplyProperties& proto) override;
 
   // content::WebUIMessageHandler:
   void RegisterMessages() override;
 
  private:
   chromeos::FakePowerManagerClient* fake_power_manager_client_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceEmulatorMessageHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_EMULATOR_DEVICE_EMULATOR_MESSAGE_HANDLER_H_