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_message_handler.h

Index: chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h b/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h
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index 0000000000000000000000000000000000000000..da23b1ecd54d357b0f94c74464a6e1ec52974dd7
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+++ b/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h
@@ -0,0 +1,45 @@
+// 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 "content/public/browser/web_ui_message_handler.h"
+
+namespace power_manager {
+class PowerSupplyProperties;
+}
+
+namespace base {
+class ListValue;
+}
+
+// Handler class for the Device Emulator page operations.
+class DeviceEmulatorMessageHandler : public content::WebUIMessageHandler {
+ public:
+  DeviceEmulatorMessageHandler();
+  ~DeviceEmulatorMessageHandler() override;
+
+  // content::WebUIMessageHandler:
+  void RegisterMessages() override;
+
+  // Callback for the "requestBatteryInfo" message. This asynchronously
+  // requests the emulator's battery percentage.
+  void HandleRequestBatteryInfo(const base::ListValue* args);
+
+  // Callback for the "updateBatteryInfo" message. This asynchronously
+  // updates the emulator's battery percentage to a given percentage
+  // contained in args.
+  void HandleUpdateBatteryInfo(const base::ListValue* args);
+
+  // Callback for the "updatePowerSource" message. This asynchronously
+  // updates the emulator's power source based on the given parameter
+  // in args.
+  void HandleUpdatePowerSource(const base::ListValue* args);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DeviceEmulatorMessageHandler);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_EMULATOR_DEVICE_EMULATOR_MESSAGE_HANDLER_H_