Create chrome://device-emulator and add the ability to get a battery percentage and send an updated…

chrome/browser/ui/webui/chromeos/emulator/device_emulator_ui.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_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_CHROMEOS_EMULATOR_DEVICE_EMULATOR_UI_H_
+
+#include "base/basictypes.h"
+#include "content/public/browser/web_ui_controller.h"
+
+namespace chromeos {
+
+class DeviceEmulatorUI : public content::WebUIController {
+ public:
+  explicit DeviceEmulatorUI(content::WebUI* web_ui);
+  ~DeviceEmulatorUI() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DeviceEmulatorUI);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_EMULATOR_DEVICE_EMULATOR_UI_H_