chrome/browser/ui/webui/chromeos/login/oobe_ui.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
   6
   7 #include "ash/ash_switches.h"
   8 #include "base/command_line.h"
   9 #include "base/logging.h"
  10 #include "base/memory/ref_counted_memory.h"
  11 #include "base/values.h"
  12 #include "chrome/browser/browser_about_handler.h"
  13 #include "chrome/browser/chrome_notification_types.h"
  14 #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_settings.h"
  15 #include "chrome/browser/chromeos/login/enrollment/enrollment_screen_actor.h"
  16 #include "chrome/browser/chromeos/login/login_display_host_impl.h"
  17 #include "chrome/browser/chromeos/login/screen_locker.h"
  18 #include "chrome/browser/chromeos/login/user_manager.h"
  19 #include "chrome/browser/chromeos/login/wizard_controller.h"
  20 #include "chrome/browser/chromeos/system/input_device_settings.h"
  21 #include "chrome/browser/profiles/profile.h"
  22 #include "chrome/browser/ui/webui/about_ui.h"
  23 #include "chrome/browser/ui/webui/chromeos/login/app_launch_splash_screen_handler.h"
  24 #include "chrome/browser/ui/webui/chromeos/login/base_screen_handler.h"
  25 #include "chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.h"
  26 #include "chrome/browser/ui/webui/chromeos/login/error_screen_handler.h"
  27 #include "chrome/browser/ui/webui/chromeos/login/eula_screen_handler.h"
  28 #include "chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.h"
  29 #include "chrome/browser/ui/webui/chromeos/login/kiosk_app_menu_handler.h"
  30 #include "chrome/browser/ui/webui/chromeos/login/kiosk_autolaunch_screen_handler.h"
  31 #include "chrome/browser/ui/webui/chromeos/login/kiosk_enable_screen_handler.h"
  32 #include "chrome/browser/ui/webui/chromeos/login/locally_managed_user_creation_screen_handler.h"
  33 #include "chrome/browser/ui/webui/chromeos/login/network_dropdown_handler.h"
  34 #include "chrome/browser/ui/webui/chromeos/login/network_screen_handler.h"
  35 #include "chrome/browser/ui/webui/chromeos/login/network_state_informer.h"
  36 #include "chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h"
  37 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
  38 #include "chrome/browser/ui/webui/chromeos/login/terms_of_service_screen_handler.h"
  39 #include "chrome/browser/ui/webui/chromeos/login/update_screen_handler.h"
  40 #include "chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.h"
  41 #include "chrome/browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.h"
  42 #include "chrome/browser/ui/webui/options/chromeos/user_image_source.h"
  43 #include "chrome/browser/ui/webui/theme_source.h"
  44 #include "chrome/common/chrome_constants.h"
  45 #include "chrome/common/url_constants.h"
  46 #include "chromeos/chromeos_constants.h"
  47 #include "chromeos/chromeos_switches.h"
  48 #include "content/public/browser/web_ui.h"
  49 #include "content/public/browser/web_ui_data_source.h"
  50 #include "grit/browser_resources.h"
  51 #include "ui/base/resource/resource_bundle.h"
  52 #include "ui/base/webui/web_ui_util.h"
  53
  54 namespace chromeos {
  55
  56 namespace {
  57
  58 // List of known types of OobeUI. Type added as path in chrome://oobe url, for
  59 // example chrome://oobe/user-adding.
  60 const char kOobeDisplay[] = "oobe";
  61 const char kLoginDisplay[] = "login";
  62 const char kLockDisplay[] = "lock";
  63 const char kUserAddingDisplay[] = "user-adding";
  64 const char kAppLaunchSplashDisplay[] = "app-launch-splash";
  65
  66 const char* kKnownDisplayTypes[] = {
  67   kOobeDisplay,
  68   kLoginDisplay,
  69   kLockDisplay,
  70   kUserAddingDisplay,
  71   kAppLaunchSplashDisplay
  72 };
  73
  74 const char kStringsJSPath[] = "strings.js";
  75 const char kLoginJSPath[] = "login.js";
  76 const char kOobeJSPath[] = "oobe.js";
  77 const char kKeyboardUtilsJSPath[] = "keyboard_utils.js";
  78 const char kDemoUserLoginJSPath[] = "demo_user_login.js";
  79
  80 // Paths for deferred resource loading.
  81 const char kEnrollmentHTMLPath[] = "enrollment.html";
  82 const char kEnrollmentCSSPath[] = "enrollment.css";
  83 const char kEnrollmentJSPath[] = "enrollment.js";
  84
  85 // Creates a WebUIDataSource for chrome://oobe
  86 content::WebUIDataSource* CreateOobeUIDataSource(
  87     const base::DictionaryValue& localized_strings,
  88     const std::string& display_type) {
  89   content::WebUIDataSource* source =
  90       content::WebUIDataSource::Create(chrome::kChromeUIOobeHost);
  91   source->SetUseJsonJSFormatV2();
  92   source->AddLocalizedStrings(localized_strings);
  93   source->SetJsonPath(kStringsJSPath);
  94
  95   if (chromeos::KioskModeSettings::Get()->IsKioskModeEnabled()) {
  96     source->SetDefaultResource(IDR_DEMO_USER_LOGIN_HTML);
  97     source->AddResourcePath(kDemoUserLoginJSPath, IDR_DEMO_USER_LOGIN_JS);
  98     return source;
  99   }
 100   if (display_type == kOobeDisplay) {
 101     source->SetDefaultResource(IDR_OOBE_HTML);
 102     source->AddResourcePath(kOobeJSPath, IDR_OOBE_JS);
 103   } else {
 104     source->SetDefaultResource(IDR_LOGIN_HTML);
 105     source->AddResourcePath(kLoginJSPath, IDR_LOGIN_JS);
 106   }
 107   source->AddResourcePath(kKeyboardUtilsJSPath, IDR_KEYBOARD_UTILS_JS);
 108   source->OverrideContentSecurityPolicyFrameSrc(
 109       "frame-src chrome://terms/ "
 110       "chrome-extension://mfffpogegjflfpflabcdkioaeobkgjik/;");
 111
 112   // Serve deferred resources.
 113   source->AddResourcePath(kEnrollmentHTMLPath, IDR_OOBE_ENROLLMENT_HTML);
 114   source->AddResourcePath(kEnrollmentCSSPath, IDR_OOBE_ENROLLMENT_CSS);
 115   source->AddResourcePath(kEnrollmentJSPath, IDR_OOBE_ENROLLMENT_JS);
 116
 117   return source;
 118 }
 119
 120 std::string GetDisplayType(const GURL& url) {
 121   std::string path = url.path().size() ? url.path().substr(1) : "";
 122   if (std::find(kKnownDisplayTypes,
 123                 kKnownDisplayTypes + arraysize(kKnownDisplayTypes),
 124                 path) == kKnownDisplayTypes + arraysize(kKnownDisplayTypes)) {
 125     LOG(ERROR) << "Unknown display type '" << path << "'. Setting default.";
 126     return kLoginDisplay;
 127   }
 128   return path;
 129 }
 130
 131 }  // namespace
 132
 133 // static
 134 const char OobeUI::kScreenOobeNetwork[]     = "connect";
 135 const char OobeUI::kScreenOobeEula[]        = "eula";
 136 const char OobeUI::kScreenOobeUpdate[]      = "update";
 137 const char OobeUI::kScreenOobeEnrollment[]  = "oauth-enrollment";
 138 const char OobeUI::kScreenGaiaSignin[]      = "gaia-signin";
 139 const char OobeUI::kScreenAccountPicker[]   = "account-picker";
 140 const char OobeUI::kScreenKioskAutolaunch[] = "autolaunch";
 141 const char OobeUI::kScreenKioskEnable[]     = "kiosk-enable";
 142 const char OobeUI::kScreenErrorMessage[]    = "error-message";
 143 const char OobeUI::kScreenUserImagePicker[] = "user-image";
 144 const char OobeUI::kScreenTpmError[]        = "tpm-error-message";
 145 const char OobeUI::kScreenPasswordChanged[] = "password-changed";
 146 const char OobeUI::kScreenManagedUserCreationFlow[]
 147                                             = "managed-user-creation";
 148 const char OobeUI::kScreenTermsOfService[]  = "terms-of-service";
 149 const char OobeUI::kScreenWrongHWID[]       = "wrong-hwid";
 150 const char OobeUI::kScreenAppLaunchSplash[] = "app-launch-splash";
 151 const char OobeUI::kScreenConfirmPassword[] = "confirm-password";
 152 const char OobeUI::kScreenMessageBox[]      = "message-box";
 153
 154 OobeUI::OobeUI(content::WebUI* web_ui, const GURL& url)
 155     : WebUIController(web_ui),
 156       core_handler_(NULL),
 157       network_dropdown_handler_(NULL),
 158       update_screen_handler_(NULL),
 159       network_screen_actor_(NULL),
 160       eula_screen_actor_(NULL),
 161       reset_screen_actor_(NULL),
 162       autolaunch_screen_actor_(NULL),
 163       kiosk_enable_screen_actor_(NULL),
 164       wrong_hwid_screen_actor_(NULL),
 165       locally_managed_user_creation_screen_actor_(NULL),
 166       error_screen_handler_(NULL),
 167       signin_screen_handler_(NULL),
 168       terms_of_service_screen_actor_(NULL),
 169       user_image_screen_actor_(NULL),
 170       kiosk_app_menu_handler_(NULL),
 171       current_screen_(SCREEN_UNKNOWN),
 172       ready_(false) {
 173   display_type_ = GetDisplayType(url);
 174   InitializeScreenMaps();
 175
 176   network_state_informer_ = new NetworkStateInformer();
 177   network_state_informer_->Init();
 178
 179   core_handler_ = new CoreOobeHandler(this);
 180   AddScreenHandler(core_handler_);
 181   core_handler_->SetDelegate(this);
 182
 183   network_dropdown_handler_ = new NetworkDropdownHandler();
 184   AddScreenHandler(network_dropdown_handler_);
 185
 186   update_screen_handler_ = new UpdateScreenHandler();
 187   AddScreenHandler(update_screen_handler_);
 188   network_dropdown_handler_->AddObserver(update_screen_handler_);
 189
 190   if (display_type_ == kOobeDisplay) {
 191     NetworkScreenHandler* network_screen_handler =
 192         new NetworkScreenHandler(core_handler_);
 193     network_screen_actor_ = network_screen_handler;
 194     AddScreenHandler(network_screen_handler);
 195   }
 196
 197   EulaScreenHandler* eula_screen_handler = new EulaScreenHandler(core_handler_);
 198   eula_screen_actor_ = eula_screen_handler;
 199   AddScreenHandler(eula_screen_handler);
 200
 201   ResetScreenHandler* reset_screen_handler = new ResetScreenHandler();
 202   reset_screen_actor_ = reset_screen_handler;
 203   AddScreenHandler(reset_screen_handler);
 204
 205   KioskAutolaunchScreenHandler* autolaunch_screen_handler =
 206       new KioskAutolaunchScreenHandler();
 207   autolaunch_screen_actor_ = autolaunch_screen_handler;
 208   AddScreenHandler(autolaunch_screen_handler);
 209
 210   KioskEnableScreenHandler* kiosk_enable_screen_handler =
 211       new KioskEnableScreenHandler();
 212   kiosk_enable_screen_actor_ = kiosk_enable_screen_handler;
 213   AddScreenHandler(kiosk_enable_screen_handler);
 214
 215   LocallyManagedUserCreationScreenHandler*
 216       locally_managed_user_creation_screen_handler =
 217           new LocallyManagedUserCreationScreenHandler();
 218   locally_managed_user_creation_screen_actor_ =
 219       locally_managed_user_creation_screen_handler;
 220   AddScreenHandler(locally_managed_user_creation_screen_handler);
 221
 222   WrongHWIDScreenHandler* wrong_hwid_screen_handler =
 223       new WrongHWIDScreenHandler();
 224   wrong_hwid_screen_actor_ = wrong_hwid_screen_handler;
 225   AddScreenHandler(wrong_hwid_screen_handler);
 226
 227   EnrollmentScreenHandler* enrollment_screen_handler =
 228       new EnrollmentScreenHandler();
 229   enrollment_screen_actor_ = enrollment_screen_handler;
 230   AddScreenHandler(enrollment_screen_handler);
 231
 232   TermsOfServiceScreenHandler* terms_of_service_screen_handler =
 233       new TermsOfServiceScreenHandler;
 234   terms_of_service_screen_actor_ = terms_of_service_screen_handler;
 235   AddScreenHandler(terms_of_service_screen_handler);
 236
 237   UserImageScreenHandler* user_image_screen_handler =
 238       new UserImageScreenHandler();
 239   user_image_screen_actor_ = user_image_screen_handler;
 240   AddScreenHandler(user_image_screen_handler);
 241
 242   error_screen_handler_ = new ErrorScreenHandler(network_state_informer_);
 243   AddScreenHandler(error_screen_handler_);
 244
 245   gaia_screen_handler_ = new GaiaScreenHandler(network_state_informer_);
 246   AddScreenHandler(gaia_screen_handler_);
 247
 248   signin_screen_handler_ = new SigninScreenHandler(network_state_informer_,
 249                                                    error_screen_handler_,
 250                                                    core_handler_,
 251                                                    gaia_screen_handler_);
 252   AddScreenHandler(signin_screen_handler_);
 253
 254   AppLaunchSplashScreenHandler* app_launch_splash_screen_handler =
 255       new AppLaunchSplashScreenHandler(network_state_informer_,
 256                                        error_screen_handler_);
 257   AddScreenHandler(app_launch_splash_screen_handler);
 258   app_launch_splash_screen_actor_ = app_launch_splash_screen_handler;
 259
 260   // Initialize KioskAppMenuHandler. Note that it is NOT a screen handler.
 261   kiosk_app_menu_handler_ = new KioskAppMenuHandler;
 262   web_ui->AddMessageHandler(kiosk_app_menu_handler_);
 263
 264   base::DictionaryValue localized_strings;
 265   GetLocalizedStrings(&localized_strings);
 266
 267   Profile* profile = Profile::FromWebUI(web_ui);
 268   // Set up the chrome://theme/ source, for Chrome logo.
 269   ThemeSource* theme = new ThemeSource(profile);
 270   content::URLDataSource::Add(profile, theme);
 271
 272   // Set up the chrome://terms/ data source, for EULA content.
 273   AboutUIHTMLSource* about_source =
 274       new AboutUIHTMLSource(chrome::kChromeUITermsHost, profile);
 275   content::URLDataSource::Add(profile, about_source);
 276
 277   // Set up the chrome://oobe/ source.
 278   content::WebUIDataSource::Add(profile,
 279                                 CreateOobeUIDataSource(localized_strings,
 280                                                        display_type_));
 281
 282   // Set up the chrome://userimage/ source.
 283   options::UserImageSource* user_image_source =
 284       new options::UserImageSource();
 285   content::URLDataSource::Add(profile, user_image_source);
 286 }
 287
 288 OobeUI::~OobeUI() {
 289   core_handler_->SetDelegate(NULL);
 290   network_dropdown_handler_->RemoveObserver(update_screen_handler_);
 291 }
 292
 293 void OobeUI::ShowScreen(WizardScreen* screen) {
 294   screen->Show();
 295 }
 296
 297 void OobeUI::HideScreen(WizardScreen* screen) {
 298   screen->Hide();
 299 }
 300
 301 UpdateScreenActor* OobeUI::GetUpdateScreenActor() {
 302   return update_screen_handler_;
 303 }
 304
 305 NetworkScreenActor* OobeUI::GetNetworkScreenActor() {
 306   return network_screen_actor_;
 307 }
 308
 309 EulaScreenActor* OobeUI::GetEulaScreenActor() {
 310   return eula_screen_actor_;
 311 }
 312
 313 EnrollmentScreenActor* OobeUI::GetEnrollmentScreenActor() {
 314   return enrollment_screen_actor_;
 315 }
 316
 317 ResetScreenActor* OobeUI::GetResetScreenActor() {
 318   return reset_screen_actor_;
 319 }
 320
 321 KioskAutolaunchScreenActor* OobeUI::GetKioskAutolaunchScreenActor() {
 322   return autolaunch_screen_actor_;
 323 }
 324
 325 KioskEnableScreenActor* OobeUI::GetKioskEnableScreenActor() {
 326   return kiosk_enable_screen_actor_;
 327 }
 328
 329 TermsOfServiceScreenActor* OobeUI::GetTermsOfServiceScreenActor() {
 330   return terms_of_service_screen_actor_;
 331 }
 332
 333 WrongHWIDScreenActor* OobeUI::GetWrongHWIDScreenActor() {
 334   return wrong_hwid_screen_actor_;
 335 }
 336
 337 UserImageScreenActor* OobeUI::GetUserImageScreenActor() {
 338   return user_image_screen_actor_;
 339 }
 340
 341 ErrorScreenActor* OobeUI::GetErrorScreenActor() {
 342   return error_screen_handler_;
 343 }
 344
 345 LocallyManagedUserCreationScreenHandler*
 346     OobeUI::GetLocallyManagedUserCreationScreenActor() {
 347   return locally_managed_user_creation_screen_actor_;
 348 }
 349
 350 AppLaunchSplashScreenActor*
 351       OobeUI::GetAppLaunchSplashScreenActor() {
 352   return app_launch_splash_screen_actor_;
 353 }
 354
 355 void OobeUI::GetLocalizedStrings(base::DictionaryValue* localized_strings) {
 356   // Note, handlers_[0] is a GenericHandler used by the WebUI.
 357   for (size_t i = 0; i < handlers_.size(); ++i)
 358     handlers_[i]->GetLocalizedStrings(localized_strings);
 359   webui::SetFontAndTextDirection(localized_strings);
 360   kiosk_app_menu_handler_->GetLocalizedStrings(localized_strings);
 361
 362 #if defined(GOOGLE_CHROME_BUILD)
 363   localized_strings->SetString("buildType", "chrome");
 364 #else
 365   localized_strings->SetString("buildType", "chromium");
 366 #endif
 367
 368   // If we're not doing boot animation then WebUI should trigger
 369   // wallpaper load on boot.
 370   if (CommandLine::ForCurrentProcess()->HasSwitch(
 371           switches::kDisableBootAnimation)) {
 372     localized_strings->SetString("bootIntoWallpaper", "on");
 373   } else {
 374     localized_strings->SetString("bootIntoWallpaper", "off");
 375   }
 376
 377   bool keyboard_driven_oobe =
 378       system::keyboard_settings::ForceKeyboardDrivenUINavigation();
 379   localized_strings->SetString("highlightStrength",
 380                                keyboard_driven_oobe ? "strong" : "normal");
 381 }
 382
 383 void OobeUI::InitializeScreenMaps() {
 384   screen_names_.resize(SCREEN_UNKNOWN);
 385   screen_names_[SCREEN_OOBE_NETWORK] = kScreenOobeNetwork;
 386   screen_names_[SCREEN_OOBE_EULA] = kScreenOobeEula;
 387   screen_names_[SCREEN_OOBE_UPDATE] = kScreenOobeUpdate;
 388   screen_names_[SCREEN_OOBE_ENROLLMENT] = kScreenOobeEnrollment;
 389   screen_names_[SCREEN_GAIA_SIGNIN] = kScreenGaiaSignin;
 390   screen_names_[SCREEN_ACCOUNT_PICKER] = kScreenAccountPicker;
 391   screen_names_[SCREEN_KIOSK_AUTOLAUNCH] = kScreenKioskAutolaunch;
 392   screen_names_[SCREEN_KIOSK_ENABLE] = kScreenKioskEnable;
 393   screen_names_[SCREEN_ERROR_MESSAGE] = kScreenErrorMessage;
 394   screen_names_[SCREEN_USER_IMAGE_PICKER] = kScreenUserImagePicker;
 395   screen_names_[SCREEN_TPM_ERROR] = kScreenTpmError;
 396   screen_names_[SCREEN_PASSWORD_CHANGED] = kScreenPasswordChanged;
 397   screen_names_[SCREEN_CREATE_MANAGED_USER_FLOW] =
 398       kScreenManagedUserCreationFlow;
 399   screen_names_[SCREEN_TERMS_OF_SERVICE] = kScreenTermsOfService;
 400   screen_names_[SCREEN_WRONG_HWID] = kScreenWrongHWID;
 401   screen_names_[SCREEN_APP_LAUNCH_SPLASH] = kScreenAppLaunchSplash;
 402   screen_names_[SCREEN_CONFIRM_PASSWORD] = kScreenConfirmPassword;
 403   screen_names_[SCREEN_MESSAGE_BOX] = kScreenMessageBox;
 404
 405   screen_ids_.clear();
 406   for (size_t i = 0; i < screen_names_.size(); ++i)
 407     screen_ids_[screen_names_[i]] = static_cast<Screen>(i);
 408 }
 409
 410 void OobeUI::AddScreenHandler(BaseScreenHandler* handler) {
 411   web_ui()->AddMessageHandler(handler);
 412   handlers_.push_back(handler);
 413 }
 414
 415 void OobeUI::InitializeHandlers() {
 416   ready_ = true;
 417   for (size_t i = 0; i < ready_callbacks_.size(); ++i)
 418     ready_callbacks_[i].Run();
 419   ready_callbacks_.clear();
 420
 421   // Notify 'initialize' for synchronously loaded screens.
 422   for (size_t i = 0; i < handlers_.size(); ++i) {
 423     if (handlers_[i]->async_assets_load_id().empty())
 424       handlers_[i]->InitializeBase();
 425   }
 426 }
 427
 428 void OobeUI::OnScreenAssetsLoaded(const std::string& async_assets_load_id) {
 429   DCHECK(!async_assets_load_id.empty());
 430
 431   for (size_t i = 0; i < handlers_.size(); ++i) {
 432     if (handlers_[i]->async_assets_load_id() == async_assets_load_id)
 433       handlers_[i]->InitializeBase();
 434   }
 435 }
 436
 437 bool OobeUI::IsJSReady(const base::Closure& display_is_ready_callback) {
 438   if (!ready_)
 439     ready_callbacks_.push_back(display_is_ready_callback);
 440   return ready_;
 441 }
 442
 443 void OobeUI::ShowOobeUI(bool show) {
 444   core_handler_->ShowOobeUI(show);
 445 }
 446
 447 void OobeUI::ShowRetailModeLoginSpinner() {
 448   signin_screen_handler_->ShowRetailModeLoginSpinner();
 449 }
 450
 451 void OobeUI::ShowSigninScreen(const LoginScreenContext& context,
 452                               SigninScreenHandlerDelegate* delegate,
 453                               NativeWindowDelegate* native_window_delegate) {
 454   signin_screen_handler_->SetDelegate(delegate);
 455   signin_screen_handler_->SetNativeWindowDelegate(native_window_delegate);
 456
 457   LoginScreenContext actual_context(context);
 458   actual_context.set_oobe_ui(core_handler_->show_oobe_ui());
 459   signin_screen_handler_->Show(actual_context);
 460 }
 461
 462 void OobeUI::ResetSigninScreenHandlerDelegate() {
 463   signin_screen_handler_->SetDelegate(NULL);
 464   signin_screen_handler_->SetNativeWindowDelegate(NULL);
 465 }
 466
 467
 468 void OobeUI::AddObserver(Observer* observer) {
 469   observer_list_.AddObserver(observer);
 470 }
 471
 472 void OobeUI::RemoveObserver(Observer* observer) {
 473   observer_list_.RemoveObserver(observer);
 474 }
 475
 476 const std::string& OobeUI::GetScreenName(Screen screen) const {
 477   DCHECK(screen >= 0 && screen < SCREEN_UNKNOWN);
 478   return screen_names_[static_cast<size_t>(screen)];
 479 }
 480
 481 void OobeUI::OnCurrentScreenChanged(const std::string& screen) {
 482   if (screen_ids_.count(screen)) {
 483     Screen new_screen = screen_ids_[screen];
 484     FOR_EACH_OBSERVER(Observer,
 485                       observer_list_,
 486                       OnCurrentScreenChanged(current_screen_, new_screen));
 487     current_screen_ = new_screen;
 488   } else {
 489     NOTREACHED() << "Screen should be registered in InitializeScreenMaps()";
 490     current_screen_ = SCREEN_UNKNOWN;
 491   }
 492 }
 493
 494 }  // namespace chromeos