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.cc

+// 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.
+
+#include "chrome/browser/ui/webui/chromeos/emulator/device_emulator_ui.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "base/values.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h"
+#include "chrome/common/url_constants.h"
+#include "chromeos/dbus/power_manager/power_supply_properties.pb.h"
+#include "content/public/browser/web_ui.h"
+#include "content/public/browser/web_ui_data_source.h"
+#include "grit/browser_resources.h"
+#include "grit/generated_resources.h"
+
+namespace {
+
+// Create data source for chrome://device-emulator/.
+content::WebUIDataSource* CreateDeviceEmulatorUIDataSource() {
+  content::WebUIDataSource* html =
+      content::WebUIDataSource::Create(chrome::kChromeUIDeviceEmulatorHost);
+
+  // Add variables for the JS to use.
+  html->AddString("acPower", base::IntToString(
+      power_manager::PowerSupplyProperties_ExternalPower_AC));
+  html->AddString("usbPower", base::IntToString(
+      power_manager::PowerSupplyProperties_ExternalPower_USB));
+  html->AddString("disconnected", base::IntToString(
+      power_manager::PowerSupplyProperties_ExternalPower_DISCONNECTED));
+  html->SetJsonPath("strings.js");
+
+  // Add resources.
+  html->AddResourcePath("device_emulator.css", IDR_DEVICE_EMULATOR_CSS);
+  html->AddResourcePath("device_emulator.js", IDR_DEVICE_EMULATOR_JS);
+  html->SetDefaultResource(IDR_DEVICE_EMULATOR_HTML);
+
+  return html;
+}
+
+}  // namespace
+
+DeviceEmulatorUI::DeviceEmulatorUI(content::WebUI* web_ui)
+    : WebUIController(web_ui) {
+  web_ui->AddMessageHandler(new DeviceEmulatorMessageHandler());
+
+  Profile* profile = Profile::FromWebUI(web_ui);
+  content::WebUIDataSource::Add(profile, CreateDeviceEmulatorUIDataSource());
+}
+
+DeviceEmulatorUI::~DeviceEmulatorUI() {
+}