src/chrome/browser/chromeos/accessibility/accessibility_manager.cc

   1 // Copyright (c) 2013 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/chromeos/accessibility/accessibility_manager.h"
   6
   7 #include "base/callback.h"
   8 #include "base/callback_helpers.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/memory/singleton.h"
  11 #include "base/metrics/histogram.h"
  12 #include "base/path_service.h"
  13 #include "base/prefs/pref_member.h"
  14 #include "base/prefs/pref_service.h"
  15 #include "base/strings/string_split.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/time/time.h"
  18 #include "base/values.h"
  19 #include "chrome/browser/accessibility/accessibility_extension_api.h"
  20 #include "chrome/browser/browser_process.h"
  21 #include "chrome/browser/chrome_notification_types.h"
  22 #include "chrome/browser/chromeos/login/lock/screen_locker.h"
  23 #include "chrome/browser/chromeos/login/ui/login_display_host.h"
  24 #include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
  25 #include "chrome/browser/chromeos/login/ui/webui_login_view.h"
  26 #include "chrome/browser/chromeos/profiles/profile_helper.h"
  27 #include "chrome/browser/chromeos/ui/accessibility_focus_ring_controller.h"
  28 #include "chrome/browser/extensions/component_loader.h"
  29 #include "chrome/browser/extensions/extension_service.h"
  30 #include "chrome/browser/profiles/profile.h"
  31 #include "chrome/browser/profiles/profile_manager.h"
  32 #include "chrome/common/chrome_paths.h"
  33 #include "chrome/common/extensions/api/accessibility_private.h"
  34 #include "chrome/common/extensions/extension_constants.h"
  35 #include "chrome/common/extensions/manifest_handlers/content_scripts_handler.h"
  36 #include "chrome/common/pref_names.h"
  37 #include "chrome/grit/browser_resources.h"
  38 #include "chromeos/audio/chromeos_sounds.h"
  39 #include "chromeos/ime/input_method_manager.h"
  40 #include "chromeos/login/login_state.h"
  41 #include "components/user_manager/user_manager.h"
  42 #include "content/public/browser/browser_accessibility_state.h"
  43 #include "content/public/browser/browser_thread.h"
  44 #include "content/public/browser/notification_details.h"
  45 #include "content/public/browser/notification_service.h"
  46 #include "content/public/browser/notification_source.h"
  47 #include "content/public/browser/render_process_host.h"
  48 #include "content/public/browser/render_view_host.h"
  49 #include "content/public/browser/web_contents.h"
  50 #include "content/public/browser/web_ui.h"
  51 #include "extensions/browser/extension_system.h"
  52 #include "extensions/browser/file_reader.h"
  53 #include "extensions/common/extension.h"
  54 #include "extensions/common/extension_messages.h"
  55 #include "extensions/common/extension_resource.h"
  56 #include "media/audio/sounds/sounds_manager.h"
  57 #include "ui/base/resource/resource_bundle.h"
  58 #include "ui/keyboard/keyboard_controller.h"
  59 #include "ui/keyboard/keyboard_util.h"
  60
  61 #if !defined(USE_ATHENA)
  62 #include "ash/audio/sounds.h"
  63 #include "ash/autoclick/autoclick_controller.h"
  64 #include "ash/high_contrast/high_contrast_controller.h"
  65 #include "ash/metrics/user_metrics_recorder.h"
  66 #include "ash/session/session_state_delegate.h"
  67 #include "ash/shell.h"
  68 #include "ash/sticky_keys/sticky_keys_controller.h"
  69 #include "ash/system/tray/system_tray_notifier.h"
  70 #include "chrome/browser/chromeos/accessibility/magnification_manager.h"
  71 #endif
  72
  73 using content::BrowserThread;
  74 using content::RenderViewHost;
  75 using extensions::api::braille_display_private::BrailleController;
  76 using extensions::api::braille_display_private::DisplayState;
  77 using extensions::api::braille_display_private::KeyEvent;
  78
  79 namespace chromeos {
  80
  81 namespace {
  82
  83 static chromeos::AccessibilityManager* g_accessibility_manager = NULL;
  84
  85 static BrailleController* g_braille_controller_for_test = NULL;
  86
  87 BrailleController* GetBrailleController() {
  88   return g_braille_controller_for_test
  89       ? g_braille_controller_for_test
  90       : BrailleController::GetInstance();
  91 }
  92
  93 base::FilePath GetChromeVoxPath() {
  94   base::FilePath path;
  95   if (!PathService::Get(chrome::DIR_RESOURCES, &path))
  96     NOTREACHED();
  97   path = path.Append(extension_misc::kChromeVoxExtensionPath);
  98   return path;
  99 }
 100
 101 // Helper class that directly loads an extension's content scripts into
 102 // all of the frames corresponding to a given RenderViewHost.
 103 class ContentScriptLoader {
 104  public:
 105   // Initialize the ContentScriptLoader with the ID of the extension
 106   // and the RenderViewHost where the scripts should be loaded.
 107   ContentScriptLoader(const std::string& extension_id,
 108                       int render_process_id,
 109                       int render_view_id)
 110       : extension_id_(extension_id),
 111         render_process_id_(render_process_id),
 112         render_view_id_(render_view_id) {}
 113
 114   // Call this once with the ExtensionResource corresponding to each
 115   // content script to be loaded.
 116   void AppendScript(extensions::ExtensionResource resource) {
 117     resources_.push(resource);
 118   }
 119
 120   // Finally, call this method once to fetch all of the resources and
 121   // load them. This method will delete this object when done.
 122   void Run() {
 123     if (resources_.empty()) {
 124       delete this;
 125       return;
 126     }
 127
 128     extensions::ExtensionResource resource = resources_.front();
 129     resources_.pop();
 130     scoped_refptr<FileReader> reader(new FileReader(resource, base::Bind(
 131         &ContentScriptLoader::OnFileLoaded, base::Unretained(this))));
 132     reader->Start();
 133   }
 134
 135  private:
 136   void OnFileLoaded(bool success, const std::string& data) {
 137     if (success) {
 138       ExtensionMsg_ExecuteCode_Params params;
 139       params.request_id = 0;
 140       params.extension_id = extension_id_;
 141       params.is_javascript = true;
 142       params.code = data;
 143       params.run_at = extensions::UserScript::DOCUMENT_IDLE;
 144       params.all_frames = true;
 145       params.match_about_blank = false;
 146       params.in_main_world = false;
 147
 148       RenderViewHost* render_view_host =
 149           RenderViewHost::FromID(render_process_id_, render_view_id_);
 150       if (render_view_host) {
 151         render_view_host->Send(new ExtensionMsg_ExecuteCode(
 152             render_view_host->GetRoutingID(), params));
 153       }
 154     }
 155     Run();
 156   }
 157
 158   std::string extension_id_;
 159   int render_process_id_;
 160   int render_view_id_;
 161   std::queue<extensions::ExtensionResource> resources_;
 162 };
 163
 164 void InjectChromeVoxContentScript(
 165     ExtensionService* extension_service,
 166     int render_process_id,
 167     int render_view_id,
 168     const base::Closure& done_cb);
 169
 170 void LoadChromeVoxExtension(
 171     Profile* profile,
 172     RenderViewHost* render_view_host,
 173     base::Closure done_cb) {
 174   ExtensionService* extension_service =
 175       extensions::ExtensionSystem::Get(profile)->extension_service();
 176   if (render_view_host) {
 177     // Wrap the passed in callback to inject the content script.
 178     done_cb = base::Bind(
 179         &InjectChromeVoxContentScript,
 180         extension_service,
 181         render_view_host->GetProcess()->GetID(),
 182         render_view_host->GetRoutingID(),
 183         done_cb);
 184   }
 185   extension_service->component_loader()->AddChromeVoxExtension(done_cb);
 186 }
 187
 188 void InjectChromeVoxContentScript(
 189     ExtensionService* extension_service,
 190     int render_process_id,
 191     int render_view_id,
 192     const base::Closure& done_cb) {
 193   // Make sure to always run |done_cb|.  ChromeVox was loaded even if we end up
 194   // not injecting into this particular render view.
 195   base::ScopedClosureRunner done_runner(done_cb);
 196   RenderViewHost* render_view_host =
 197       RenderViewHost::FromID(render_process_id, render_view_id);
 198   if (!render_view_host)
 199     return;
 200   const extensions::Extension* extension =
 201       extension_service->extensions()->GetByID(
 202           extension_misc::kChromeVoxExtensionId);
 203
 204   // Set a flag to tell ChromeVox that it's just been enabled,
 205   // so that it won't interrupt our speech feedback enabled message.
 206   ExtensionMsg_ExecuteCode_Params params;
 207   params.request_id = 0;
 208   params.extension_id = extension->id();
 209   params.is_javascript = true;
 210   params.code = "window.INJECTED_AFTER_LOAD = true;";
 211   params.run_at = extensions::UserScript::DOCUMENT_IDLE;
 212   params.all_frames = true;
 213   params.match_about_blank = false;
 214   params.in_main_world = false;
 215   render_view_host->Send(new ExtensionMsg_ExecuteCode(
 216       render_view_host->GetRoutingID(), params));
 217
 218   // Inject ChromeVox' content scripts.
 219   ContentScriptLoader* loader = new ContentScriptLoader(
 220       extension->id(), render_view_host->GetProcess()->GetID(),
 221       render_view_host->GetRoutingID());
 222
 223   const extensions::UserScriptList& content_scripts =
 224       extensions::ContentScriptsInfo::GetContentScripts(extension);
 225   for (size_t i = 0; i < content_scripts.size(); i++) {
 226     const extensions::UserScript& script = content_scripts[i];
 227     for (size_t j = 0; j < script.js_scripts().size(); ++j) {
 228       const extensions::UserScript::File& file = script.js_scripts()[j];
 229       extensions::ExtensionResource resource = extension->GetResource(
 230           file.relative_path());
 231       loader->AppendScript(resource);
 232     }
 233   }
 234   loader->Run();  // It cleans itself up when done.
 235 }
 236
 237 void UnloadChromeVoxExtension(Profile* profile) {
 238   base::FilePath path = GetChromeVoxPath();
 239   ExtensionService* extension_service =
 240       extensions::ExtensionSystem::Get(profile)->extension_service();
 241   extension_service->component_loader()->Remove(path);
 242 }
 243
 244 }  // namespace
 245
 246 ///////////////////////////////////////////////////////////////////////////////
 247 // AccessibilityStatusEventDetails
 248
 249 AccessibilityStatusEventDetails::AccessibilityStatusEventDetails(
 250     AccessibilityNotificationType notification_type,
 251     bool enabled,
 252     ui::AccessibilityNotificationVisibility notify)
 253   : notification_type(notification_type),
 254     enabled(enabled),
 255     magnifier_type(ui::kDefaultMagnifierType),
 256     notify(notify) {}
 257
 258 AccessibilityStatusEventDetails::AccessibilityStatusEventDetails(
 259     AccessibilityNotificationType notification_type,
 260     bool enabled,
 261     ui::MagnifierType magnifier_type,
 262     ui::AccessibilityNotificationVisibility notify)
 263   : notification_type(notification_type),
 264     enabled(enabled),
 265     magnifier_type(magnifier_type),
 266     notify(notify) {}
 267
 268 ///////////////////////////////////////////////////////////////////////////////
 269 //
 270 // AccessibilityManager::PrefHandler
 271
 272 AccessibilityManager::PrefHandler::PrefHandler(const char* pref_path)
 273     : pref_path_(pref_path) {}
 274
 275 AccessibilityManager::PrefHandler::~PrefHandler() {}
 276
 277 void AccessibilityManager::PrefHandler::HandleProfileChanged(
 278     Profile* previous_profile, Profile* current_profile) {
 279   // Returns if the current profile is null.
 280   if (!current_profile)
 281     return;
 282
 283   // If the user set a pref value on the login screen and is now starting a
 284   // session with a new profile, copy the pref value to the profile.
 285   if ((previous_profile &&
 286        ProfileHelper::IsSigninProfile(previous_profile) &&
 287        current_profile->IsNewProfile() &&
 288        !ProfileHelper::IsSigninProfile(current_profile)) ||
 289       // Special case for Guest mode:
 290       // Guest mode launches a guest-mode browser process before session starts,
 291       // so the previous profile is null.
 292       (!previous_profile &&
 293        current_profile->IsGuestSession())) {
 294     // Returns if the pref has not been set by the user.
 295     const PrefService::Preference* pref = ProfileHelper::GetSigninProfile()->
 296         GetPrefs()->FindPreference(pref_path_);
 297     if (!pref || !pref->IsUserControlled())
 298       return;
 299
 300     // Copy the pref value from the signin screen.
 301     const base::Value* value_on_login = pref->GetValue();
 302     PrefService* user_prefs = current_profile->GetPrefs();
 303     user_prefs->Set(pref_path_, *value_on_login);
 304   }
 305 }
 306
 307 ///////////////////////////////////////////////////////////////////////////////
 308 //
 309 // AccessibilityManager
 310
 311 // static
 312 void AccessibilityManager::Initialize() {
 313   CHECK(g_accessibility_manager == NULL);
 314   g_accessibility_manager = new AccessibilityManager();
 315 }
 316
 317 // static
 318 void AccessibilityManager::Shutdown() {
 319   CHECK(g_accessibility_manager);
 320   delete g_accessibility_manager;
 321   g_accessibility_manager = NULL;
 322 }
 323
 324 // static
 325 AccessibilityManager* AccessibilityManager::Get() {
 326   return g_accessibility_manager;
 327 }
 328
 329 AccessibilityManager::AccessibilityManager()
 330     : profile_(NULL),
 331       chrome_vox_loaded_on_lock_screen_(false),
 332       chrome_vox_loaded_on_user_screen_(false),
 333       large_cursor_pref_handler_(prefs::kAccessibilityLargeCursorEnabled),
 334       spoken_feedback_pref_handler_(prefs::kAccessibilitySpokenFeedbackEnabled),
 335       high_contrast_pref_handler_(prefs::kAccessibilityHighContrastEnabled),
 336       autoclick_pref_handler_(prefs::kAccessibilityAutoclickEnabled),
 337       autoclick_delay_pref_handler_(prefs::kAccessibilityAutoclickDelayMs),
 338       virtual_keyboard_pref_handler_(
 339           prefs::kAccessibilityVirtualKeyboardEnabled),
 340       large_cursor_enabled_(false),
 341       sticky_keys_enabled_(false),
 342       spoken_feedback_enabled_(false),
 343       high_contrast_enabled_(false),
 344       autoclick_enabled_(false),
 345 #if defined(USE_ATHENA)
 346       autoclick_delay_ms_(400),
 347 #else
 348       autoclick_delay_ms_(ash::AutoclickController::kDefaultAutoclickDelayMs),
 349 #endif
 350       virtual_keyboard_enabled_(false),
 351       spoken_feedback_notification_(ui::A11Y_NOTIFICATION_NONE),
 352       should_speak_chrome_vox_announcements_on_user_screen_(true),
 353       system_sounds_enabled_(false),
 354       braille_display_connected_(false),
 355       scoped_braille_observer_(this),
 356       braille_ime_current_(false),
 357       weak_ptr_factory_(this) {
 358   notification_registrar_.Add(this,
 359                               chrome::NOTIFICATION_LOGIN_OR_LOCK_WEBUI_VISIBLE,
 360                               content::NotificationService::AllSources());
 361   notification_registrar_.Add(this,
 362                               chrome::NOTIFICATION_SESSION_STARTED,
 363                               content::NotificationService::AllSources());
 364   notification_registrar_.Add(this,
 365                               chrome::NOTIFICATION_PROFILE_DESTROYED,
 366                               content::NotificationService::AllSources());
 367   notification_registrar_.Add(this,
 368                               chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED,
 369                               content::NotificationService::AllSources());
 370
 371   input_method::InputMethodManager::Get()->AddObserver(this);
 372
 373   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
 374   media::SoundsManager* manager = media::SoundsManager::Get();
 375   manager->Initialize(SOUND_SHUTDOWN,
 376                       bundle.GetRawDataResource(IDR_SOUND_SHUTDOWN_WAV));
 377   manager->Initialize(
 378       SOUND_SPOKEN_FEEDBACK_ENABLED,
 379       bundle.GetRawDataResource(IDR_SOUND_SPOKEN_FEEDBACK_ENABLED_WAV));
 380   manager->Initialize(
 381       SOUND_SPOKEN_FEEDBACK_DISABLED,
 382       bundle.GetRawDataResource(IDR_SOUND_SPOKEN_FEEDBACK_DISABLED_WAV));
 383   manager->Initialize(SOUND_PASSTHROUGH,
 384                       bundle.GetRawDataResource(IDR_SOUND_PASSTHROUGH_WAV));
 385   manager->Initialize(SOUND_EXIT_SCREEN,
 386                       bundle.GetRawDataResource(IDR_SOUND_EXIT_SCREEN_WAV));
 387   manager->Initialize(SOUND_ENTER_SCREEN,
 388                       bundle.GetRawDataResource(IDR_SOUND_ENTER_SCREEN_WAV));
 389 }
 390
 391 AccessibilityManager::~AccessibilityManager() {
 392   CHECK(this == g_accessibility_manager);
 393   AccessibilityStatusEventDetails details(
 394       ACCESSIBILITY_MANAGER_SHUTDOWN,
 395       false,
 396       ui::A11Y_NOTIFICATION_NONE);
 397   NotifyAccessibilityStatusChanged(details);
 398   input_method::InputMethodManager::Get()->RemoveObserver(this);
 399 }
 400
 401 bool AccessibilityManager::ShouldShowAccessibilityMenu() {
 402   // If any of the loaded profiles has an accessibility feature turned on - or
 403   // enforced to always show the menu - we return true to show the menu.
 404   std::vector<Profile*> profiles =
 405       g_browser_process->profile_manager()->GetLoadedProfiles();
 406   for (std::vector<Profile*>::iterator it = profiles.begin();
 407        it != profiles.end();
 408        ++it) {
 409     PrefService* pref_service = (*it)->GetPrefs();
 410     if (pref_service->GetBoolean(prefs::kAccessibilityStickyKeysEnabled) ||
 411         pref_service->GetBoolean(prefs::kAccessibilityLargeCursorEnabled) ||
 412         pref_service->GetBoolean(prefs::kAccessibilitySpokenFeedbackEnabled) ||
 413         pref_service->GetBoolean(prefs::kAccessibilityHighContrastEnabled) ||
 414         pref_service->GetBoolean(prefs::kAccessibilityAutoclickEnabled) ||
 415         pref_service->GetBoolean(prefs::kShouldAlwaysShowAccessibilityMenu) ||
 416         pref_service->GetBoolean(prefs::kAccessibilityScreenMagnifierEnabled) ||
 417         pref_service->GetBoolean(prefs::kAccessibilityVirtualKeyboardEnabled))
 418       return true;
 419   }
 420   return false;
 421 }
 422
 423 bool AccessibilityManager::ShouldEnableCursorCompositing() {
 424 #if defined(OS_CHROMEOS)
 425   if (!profile_)
 426     return false;
 427   PrefService* pref_service = profile_->GetPrefs();
 428   // Enable cursor compositing when one or more of the listed accessibility
 429   // features are turned on.
 430   if (pref_service->GetBoolean(prefs::kAccessibilityLargeCursorEnabled) ||
 431       pref_service->GetBoolean(prefs::kAccessibilityHighContrastEnabled) ||
 432       pref_service->GetBoolean(prefs::kAccessibilityScreenMagnifierEnabled))
 433     return true;
 434 #endif
 435   return false;
 436 }
 437
 438 void AccessibilityManager::EnableLargeCursor(bool enabled) {
 439   if (!profile_)
 440     return;
 441
 442   PrefService* pref_service = profile_->GetPrefs();
 443   pref_service->SetBoolean(prefs::kAccessibilityLargeCursorEnabled, enabled);
 444   pref_service->CommitPendingWrite();
 445 }
 446
 447 void AccessibilityManager::UpdateLargeCursorFromPref() {
 448   if (!profile_)
 449     return;
 450
 451   const bool enabled =
 452       profile_->GetPrefs()->GetBoolean(prefs::kAccessibilityLargeCursorEnabled);
 453
 454   if (large_cursor_enabled_ == enabled)
 455     return;
 456
 457   large_cursor_enabled_ = enabled;
 458
 459   AccessibilityStatusEventDetails details(
 460       ACCESSIBILITY_TOGGLE_LARGE_CURSOR,
 461       enabled,
 462       ui::A11Y_NOTIFICATION_NONE);
 463
 464   NotifyAccessibilityStatusChanged(details);
 465 #if !defined(USE_ATHENA)
 466   // crbug.com/408733 (and for all USE_ATHENA in this file)
 467
 468 #if defined(USE_ASH)
 469   // Large cursor is implemented only in ash.
 470   ash::Shell::GetInstance()->cursor_manager()->SetCursorSet(
 471       enabled ? ui::CURSOR_SET_LARGE : ui::CURSOR_SET_NORMAL);
 472 #endif
 473
 474 #if defined(OS_CHROMEOS)
 475   ash::Shell::GetInstance()->SetCursorCompositingEnabled(
 476       ShouldEnableCursorCompositing());
 477 #endif
 478
 479 #endif // !USE_ATHENA
 480 }
 481
 482 bool AccessibilityManager::IsIncognitoAllowed() {
 483   // Supervised users can't create incognito-mode windows.
 484   return !(user_manager::UserManager::Get()->IsLoggedInAsSupervisedUser());
 485 }
 486
 487 bool AccessibilityManager::IsLargeCursorEnabled() {
 488   return large_cursor_enabled_;
 489 }
 490
 491 void AccessibilityManager::EnableStickyKeys(bool enabled) {
 492   if (!profile_)
 493     return;
 494   PrefService* pref_service = profile_->GetPrefs();
 495   pref_service->SetBoolean(prefs::kAccessibilityStickyKeysEnabled, enabled);
 496   pref_service->CommitPendingWrite();
 497 }
 498
 499 bool AccessibilityManager::IsStickyKeysEnabled() {
 500   return sticky_keys_enabled_;
 501 }
 502
 503 void AccessibilityManager::UpdateStickyKeysFromPref() {
 504   if (!profile_)
 505     return;
 506
 507   const bool enabled =
 508       profile_->GetPrefs()->GetBoolean(prefs::kAccessibilityStickyKeysEnabled);
 509
 510   if (sticky_keys_enabled_ == enabled)
 511     return;
 512
 513   sticky_keys_enabled_ = enabled;
 514 #if defined(USE_ASH) && !defined(USE_ATHENA)
 515   ash::Shell::GetInstance()->sticky_keys_controller()->Enable(enabled);
 516 #endif
 517 }
 518
 519 void AccessibilityManager::EnableSpokenFeedback(
 520     bool enabled,
 521     ui::AccessibilityNotificationVisibility notify) {
 522   if (!profile_)
 523     return;
 524 #if !defined(USE_ATHENA)
 525   ash::Shell::GetInstance()->metrics()->RecordUserMetricsAction(
 526       enabled ? ash::UMA_STATUS_AREA_ENABLE_SPOKEN_FEEDBACK
 527               : ash::UMA_STATUS_AREA_DISABLE_SPOKEN_FEEDBACK);
 528 #endif
 529
 530   spoken_feedback_notification_ = notify;
 531
 532   PrefService* pref_service = profile_->GetPrefs();
 533   pref_service->SetBoolean(prefs::kAccessibilitySpokenFeedbackEnabled, enabled);
 534   pref_service->CommitPendingWrite();
 535
 536   spoken_feedback_notification_ = ui::A11Y_NOTIFICATION_NONE;
 537 }
 538
 539 void AccessibilityManager::UpdateSpokenFeedbackFromPref() {
 540   if (!profile_)
 541     return;
 542
 543   const bool enabled = profile_->GetPrefs()->GetBoolean(
 544       prefs::kAccessibilitySpokenFeedbackEnabled);
 545
 546   if (spoken_feedback_enabled_ == enabled)
 547     return;
 548
 549   spoken_feedback_enabled_ = enabled;
 550
 551   ExtensionAccessibilityEventRouter::GetInstance()->
 552       SetAccessibilityEnabled(enabled);
 553
 554   AccessibilityStatusEventDetails details(
 555       ACCESSIBILITY_TOGGLE_SPOKEN_FEEDBACK,
 556       enabled,
 557       spoken_feedback_notification_);
 558
 559   NotifyAccessibilityStatusChanged(details);
 560
 561   if (enabled) {
 562     LoadChromeVox();
 563   } else {
 564     UnloadChromeVox();
 565   }
 566   UpdateBrailleImeState();
 567 }
 568
 569 void AccessibilityManager::LoadChromeVox() {
 570   base::Closure done_cb = base::Bind(&AccessibilityManager::PostLoadChromeVox,
 571                                      weak_ptr_factory_.GetWeakPtr(),
 572                                      profile_);
 573   ScreenLocker* screen_locker = ScreenLocker::default_screen_locker();
 574   if (screen_locker && screen_locker->locked()) {
 575     // If on the lock screen, loads ChromeVox only to the lock screen as for
 576     // now. On unlock, it will be loaded to the user screen.
 577     // (see. AccessibilityManager::Observe())
 578     LoadChromeVoxToLockScreen(done_cb);
 579   } else {
 580     LoadChromeVoxToUserScreen(done_cb);
 581   }
 582 }
 583
 584 void AccessibilityManager::LoadChromeVoxToUserScreen(
 585     const base::Closure& done_cb) {
 586   if (chrome_vox_loaded_on_user_screen_)
 587     return;
 588
 589   // Determine whether an OOBE screen is currently being shown. If so,
 590   // ChromeVox will be injected directly into that screen.
 591   content::WebUI* login_web_ui = NULL;
 592
 593   if (ProfileHelper::IsSigninProfile(profile_)) {
 594     LoginDisplayHost* login_display_host = LoginDisplayHostImpl::default_host();
 595     if (login_display_host) {
 596       WebUILoginView* web_ui_login_view =
 597           login_display_host->GetWebUILoginView();
 598       if (web_ui_login_view)
 599         login_web_ui = web_ui_login_view->GetWebUI();
 600     }
 601
 602     // Lock screen uses the signin progile.
 603     chrome_vox_loaded_on_lock_screen_ = true;
 604   }
 605
 606   chrome_vox_loaded_on_user_screen_ = true;
 607   LoadChromeVoxExtension(
 608       profile_, login_web_ui ?
 609       login_web_ui->GetWebContents()->GetRenderViewHost() : NULL,
 610       done_cb);
 611 }
 612
 613 void AccessibilityManager::LoadChromeVoxToLockScreen(
 614     const base::Closure& done_cb) {
 615   if (chrome_vox_loaded_on_lock_screen_)
 616     return;
 617
 618   ScreenLocker* screen_locker = ScreenLocker::default_screen_locker();
 619   if (screen_locker && screen_locker->locked()) {
 620     content::WebUI* lock_web_ui = screen_locker->GetAssociatedWebUI();
 621     if (lock_web_ui) {
 622       Profile* profile = Profile::FromWebUI(lock_web_ui);
 623       chrome_vox_loaded_on_lock_screen_ = true;
 624       LoadChromeVoxExtension(
 625           profile,
 626           lock_web_ui->GetWebContents()->GetRenderViewHost(),
 627           done_cb);
 628     }
 629   }
 630 }
 631
 632 void AccessibilityManager::UnloadChromeVox() {
 633   if (chrome_vox_loaded_on_lock_screen_)
 634     UnloadChromeVoxFromLockScreen();
 635
 636   if (chrome_vox_loaded_on_user_screen_) {
 637     UnloadChromeVoxExtension(profile_);
 638     chrome_vox_loaded_on_user_screen_ = false;
 639   }
 640
 641   PostUnloadChromeVox(profile_);
 642 }
 643
 644 void AccessibilityManager::UnloadChromeVoxFromLockScreen() {
 645   // Lock screen uses the signin progile.
 646   Profile* signin_profile = ProfileHelper::GetSigninProfile();
 647   UnloadChromeVoxExtension(signin_profile);
 648   chrome_vox_loaded_on_lock_screen_ = false;
 649 }
 650
 651 bool AccessibilityManager::IsSpokenFeedbackEnabled() {
 652   return spoken_feedback_enabled_;
 653 }
 654
 655 void AccessibilityManager::ToggleSpokenFeedback(
 656     ui::AccessibilityNotificationVisibility notify) {
 657   EnableSpokenFeedback(!IsSpokenFeedbackEnabled(), notify);
 658 }
 659
 660 void AccessibilityManager::EnableHighContrast(bool enabled) {
 661   if (!profile_)
 662     return;
 663
 664   PrefService* pref_service = profile_->GetPrefs();
 665   pref_service->SetBoolean(prefs::kAccessibilityHighContrastEnabled, enabled);
 666   pref_service->CommitPendingWrite();
 667 }
 668
 669 void AccessibilityManager::UpdateHighContrastFromPref() {
 670   if (!profile_)
 671     return;
 672
 673   const bool enabled = profile_->GetPrefs()->GetBoolean(
 674       prefs::kAccessibilityHighContrastEnabled);
 675
 676   if (high_contrast_enabled_ == enabled)
 677     return;
 678
 679   high_contrast_enabled_ = enabled;
 680
 681   AccessibilityStatusEventDetails details(
 682       ACCESSIBILITY_TOGGLE_HIGH_CONTRAST_MODE,
 683       enabled,
 684       ui::A11Y_NOTIFICATION_NONE);
 685
 686   NotifyAccessibilityStatusChanged(details);
 687
 688 #if !defined(USE_ATHENA)
 689
 690 #if defined(USE_ASH)
 691   ash::Shell::GetInstance()->high_contrast_controller()->SetEnabled(enabled);
 692 #endif
 693
 694 #if defined(OS_CHROMEOS)
 695   ash::Shell::GetInstance()->SetCursorCompositingEnabled(
 696       ShouldEnableCursorCompositing());
 697 #endif
 698
 699 #endif
 700 }
 701
 702 void AccessibilityManager::OnLocaleChanged() {
 703   if (!profile_)
 704     return;
 705
 706   if (!IsSpokenFeedbackEnabled())
 707     return;
 708
 709   // If the system locale changes and spoken feedback is enabled,
 710   // reload ChromeVox so that it switches its internal translations
 711   // to the new language.
 712   EnableSpokenFeedback(false, ui::A11Y_NOTIFICATION_NONE);
 713   EnableSpokenFeedback(true, ui::A11Y_NOTIFICATION_NONE);
 714 }
 715
 716 void AccessibilityManager::PlayEarcon(int sound_key) {
 717 #if !defined(USE_ATHENA)
 718   DCHECK(sound_key < chromeos::SOUND_COUNT);
 719   ash::PlaySystemSoundIfSpokenFeedback(sound_key);
 720 #endif
 721 }
 722
 723 bool AccessibilityManager::IsHighContrastEnabled() {
 724   return high_contrast_enabled_;
 725 }
 726
 727 void AccessibilityManager::EnableAutoclick(bool enabled) {
 728   if (!profile_)
 729     return;
 730
 731   PrefService* pref_service = profile_->GetPrefs();
 732   pref_service->SetBoolean(prefs::kAccessibilityAutoclickEnabled, enabled);
 733   pref_service->CommitPendingWrite();
 734 }
 735
 736 bool AccessibilityManager::IsAutoclickEnabled() {
 737   return autoclick_enabled_;
 738 }
 739
 740 void AccessibilityManager::UpdateAutoclickFromPref() {
 741   bool enabled =
 742       profile_->GetPrefs()->GetBoolean(prefs::kAccessibilityAutoclickEnabled);
 743
 744   if (autoclick_enabled_ == enabled)
 745     return;
 746   autoclick_enabled_ = enabled;
 747
 748 #if defined(USE_ASH) && !defined(USE_ATHENA)
 749   ash::Shell::GetInstance()->autoclick_controller()->SetEnabled(enabled);
 750 #endif
 751 }
 752
 753 void AccessibilityManager::SetAutoclickDelay(int delay_ms) {
 754   if (!profile_)
 755     return;
 756
 757   PrefService* pref_service = profile_->GetPrefs();
 758   pref_service->SetInteger(prefs::kAccessibilityAutoclickDelayMs, delay_ms);
 759   pref_service->CommitPendingWrite();
 760 }
 761
 762 int AccessibilityManager::GetAutoclickDelay() const {
 763   return autoclick_delay_ms_;
 764 }
 765
 766 void AccessibilityManager::UpdateAutoclickDelayFromPref() {
 767   int autoclick_delay_ms =
 768       profile_->GetPrefs()->GetInteger(prefs::kAccessibilityAutoclickDelayMs);
 769
 770   if (autoclick_delay_ms == autoclick_delay_ms_)
 771     return;
 772   autoclick_delay_ms_ = autoclick_delay_ms;
 773
 774 #if defined(USE_ASH) && !defined(USE_ATHENA)
 775   ash::Shell::GetInstance()->autoclick_controller()->SetAutoclickDelay(
 776       autoclick_delay_ms_);
 777 #endif
 778 }
 779
 780 void AccessibilityManager::EnableVirtualKeyboard(bool enabled) {
 781   if (!profile_)
 782     return;
 783
 784   PrefService* pref_service = profile_->GetPrefs();
 785   pref_service->SetBoolean(prefs::kAccessibilityVirtualKeyboardEnabled,
 786                            enabled);
 787   pref_service->CommitPendingWrite();
 788 }
 789
 790 bool AccessibilityManager::IsVirtualKeyboardEnabled() {
 791   return virtual_keyboard_enabled_;
 792 }
 793
 794 void AccessibilityManager::UpdateVirtualKeyboardFromPref() {
 795   if (!profile_)
 796     return;
 797
 798   const bool enabled = profile_->GetPrefs()->GetBoolean(
 799       prefs::kAccessibilityVirtualKeyboardEnabled);
 800
 801   if (virtual_keyboard_enabled_ == enabled)
 802     return;
 803   virtual_keyboard_enabled_ = enabled;
 804
 805 #if defined(USE_ASH) && !defined(USE_ATHENA)
 806   keyboard::SetAccessibilityKeyboardEnabled(enabled);
 807   // Note that there are two versions of the on-screen keyboard. A full layout
 808   // is provided for accessibility, which includes sticky modifier keys to
 809   // enable typing of hotkeys. A compact version is used in touchview mode
 810   // to provide a layout with larger keys to facilitate touch typing. In the
 811   // event that the a11y keyboard is being disabled, an on-screen keyboard might
 812   // still be enabled and a forced reset is required to pick up the layout
 813   // change.
 814   if (keyboard::IsKeyboardEnabled())
 815     ash::Shell::GetInstance()->CreateKeyboard();
 816   else
 817     ash::Shell::GetInstance()->DeactivateKeyboard();
 818 #endif
 819
 820   AccessibilityStatusEventDetails details(
 821       ACCESSIBILITY_TOGGLE_VIRTUAL_KEYBOARD,
 822       enabled,
 823       ui::A11Y_NOTIFICATION_NONE);
 824   NotifyAccessibilityStatusChanged(details);
 825 }
 826
 827 bool AccessibilityManager::IsBrailleDisplayConnected() const {
 828   return braille_display_connected_;
 829 }
 830
 831 void AccessibilityManager::CheckBrailleState() {
 832   BrailleController* braille_controller = GetBrailleController();
 833   if (!scoped_braille_observer_.IsObserving(braille_controller))
 834     scoped_braille_observer_.Add(braille_controller);
 835   BrowserThread::PostTaskAndReplyWithResult(
 836       BrowserThread::IO,
 837       FROM_HERE,
 838       base::Bind(&BrailleController::GetDisplayState,
 839                  base::Unretained(braille_controller)),
 840       base::Bind(&AccessibilityManager::ReceiveBrailleDisplayState,
 841                  weak_ptr_factory_.GetWeakPtr()));
 842 }
 843
 844 void AccessibilityManager::ReceiveBrailleDisplayState(
 845     scoped_ptr<extensions::api::braille_display_private::DisplayState> state) {
 846   OnBrailleDisplayStateChanged(*state);
 847 }
 848
 849 void AccessibilityManager::UpdateBrailleImeState() {
 850   if (!profile_)
 851     return;
 852   PrefService* pref_service = profile_->GetPrefs();
 853   std::vector<std::string> preload_engines;
 854   base::SplitString(pref_service->GetString(prefs::kLanguagePreloadEngines),
 855                     ',',
 856                     &preload_engines);
 857   std::vector<std::string>::iterator it =
 858       std::find(preload_engines.begin(),
 859                 preload_engines.end(),
 860                 extension_misc::kBrailleImeEngineId);
 861   bool is_enabled = (it != preload_engines.end());
 862   bool should_be_enabled =
 863       (spoken_feedback_enabled_ && braille_display_connected_);
 864   if (is_enabled == should_be_enabled)
 865     return;
 866   if (should_be_enabled)
 867     preload_engines.push_back(extension_misc::kBrailleImeEngineId);
 868   else
 869     preload_engines.erase(it);
 870   pref_service->SetString(prefs::kLanguagePreloadEngines,
 871                           JoinString(preload_engines, ','));
 872   braille_ime_current_ = false;
 873 }
 874
 875 // Overridden from InputMethodManager::Observer.
 876 void AccessibilityManager::InputMethodChanged(
 877     input_method::InputMethodManager* manager,
 878     bool show_message) {
 879 #if defined(USE_ASH) && !defined(USE_ATHENA)
 880   // Sticky keys is implemented only in ash.
 881   // TODO(dpolukhin): support Athena, crbug.com/408733.
 882   ash::Shell::GetInstance()->sticky_keys_controller()->SetModifiersEnabled(
 883       manager->IsISOLevel5ShiftUsedByCurrentInputMethod(),
 884       manager->IsAltGrUsedByCurrentInputMethod());
 885 #endif
 886   const chromeos::input_method::InputMethodDescriptor descriptor =
 887       manager->GetActiveIMEState()->GetCurrentInputMethod();
 888   braille_ime_current_ =
 889       (descriptor.id() == extension_misc::kBrailleImeEngineId);
 890 }
 891
 892 void AccessibilityManager::SetProfile(Profile* profile) {
 893   pref_change_registrar_.reset();
 894   local_state_pref_change_registrar_.reset();
 895
 896   if (profile) {
 897     // TODO(yoshiki): Move following code to PrefHandler.
 898     pref_change_registrar_.reset(new PrefChangeRegistrar);
 899     pref_change_registrar_->Init(profile->GetPrefs());
 900     pref_change_registrar_->Add(
 901         prefs::kAccessibilityLargeCursorEnabled,
 902         base::Bind(&AccessibilityManager::UpdateLargeCursorFromPref,
 903                    base::Unretained(this)));
 904     pref_change_registrar_->Add(
 905         prefs::kAccessibilityStickyKeysEnabled,
 906         base::Bind(&AccessibilityManager::UpdateStickyKeysFromPref,
 907                    base::Unretained(this)));
 908     pref_change_registrar_->Add(
 909         prefs::kAccessibilitySpokenFeedbackEnabled,
 910         base::Bind(&AccessibilityManager::UpdateSpokenFeedbackFromPref,
 911                    base::Unretained(this)));
 912     pref_change_registrar_->Add(
 913         prefs::kAccessibilityHighContrastEnabled,
 914         base::Bind(&AccessibilityManager::UpdateHighContrastFromPref,
 915                    base::Unretained(this)));
 916     pref_change_registrar_->Add(
 917         prefs::kAccessibilityAutoclickEnabled,
 918         base::Bind(&AccessibilityManager::UpdateAutoclickFromPref,
 919                    base::Unretained(this)));
 920     pref_change_registrar_->Add(
 921         prefs::kAccessibilityAutoclickDelayMs,
 922         base::Bind(&AccessibilityManager::UpdateAutoclickDelayFromPref,
 923                    base::Unretained(this)));
 924     pref_change_registrar_->Add(
 925         prefs::kAccessibilityVirtualKeyboardEnabled,
 926         base::Bind(&AccessibilityManager::UpdateVirtualKeyboardFromPref,
 927                    base::Unretained(this)));
 928
 929     local_state_pref_change_registrar_.reset(new PrefChangeRegistrar);
 930     local_state_pref_change_registrar_->Init(g_browser_process->local_state());
 931     local_state_pref_change_registrar_->Add(
 932         prefs::kApplicationLocale,
 933         base::Bind(&AccessibilityManager::OnLocaleChanged,
 934                    base::Unretained(this)));
 935
 936     content::BrowserAccessibilityState::GetInstance()->AddHistogramCallback(
 937         base::Bind(
 938             &AccessibilityManager::UpdateChromeOSAccessibilityHistograms,
 939             base::Unretained(this)));
 940   }
 941
 942   large_cursor_pref_handler_.HandleProfileChanged(profile_, profile);
 943   spoken_feedback_pref_handler_.HandleProfileChanged(profile_, profile);
 944   high_contrast_pref_handler_.HandleProfileChanged(profile_, profile);
 945   autoclick_pref_handler_.HandleProfileChanged(profile_, profile);
 946   autoclick_delay_pref_handler_.HandleProfileChanged(profile_, profile);
 947   virtual_keyboard_pref_handler_.HandleProfileChanged(profile_, profile);
 948
 949   bool had_profile = (profile_ != NULL);
 950   profile_ = profile;
 951
 952   if (!had_profile && profile)
 953     CheckBrailleState();
 954   else
 955     UpdateBrailleImeState();
 956   UpdateLargeCursorFromPref();
 957   UpdateStickyKeysFromPref();
 958   UpdateSpokenFeedbackFromPref();
 959   UpdateHighContrastFromPref();
 960   UpdateAutoclickFromPref();
 961   UpdateAutoclickDelayFromPref();
 962   UpdateVirtualKeyboardFromPref();
 963 }
 964
 965 #if !defined(USE_ATHENA)
 966 void AccessibilityManager::ActiveUserChanged(const std::string& user_id) {
 967   SetProfile(ProfileManager::GetActiveUserProfile());
 968 }
 969 #endif
 970
 971 void AccessibilityManager::SetProfileForTest(Profile* profile) {
 972   SetProfile(profile);
 973 }
 974
 975 void AccessibilityManager::SetBrailleControllerForTest(
 976     BrailleController* controller) {
 977   g_braille_controller_for_test = controller;
 978 }
 979
 980 void AccessibilityManager::EnableSystemSounds(bool system_sounds_enabled) {
 981   system_sounds_enabled_ = system_sounds_enabled;
 982 }
 983
 984 base::TimeDelta AccessibilityManager::PlayShutdownSound() {
 985   if (!system_sounds_enabled_)
 986     return base::TimeDelta();
 987   system_sounds_enabled_ = false;
 988 #if !defined(USE_ATHENA)
 989   if (!ash::PlaySystemSoundIfSpokenFeedback(SOUND_SHUTDOWN))
 990     return base::TimeDelta();
 991 #endif
 992   return media::SoundsManager::Get()->GetDuration(SOUND_SHUTDOWN);
 993 }
 994
 995 void AccessibilityManager::InjectChromeVox(RenderViewHost* render_view_host) {
 996   LoadChromeVoxExtension(profile_, render_view_host, base::Closure());
 997 }
 998
 999 scoped_ptr<AccessibilityStatusSubscription>
1000     AccessibilityManager::RegisterCallback(
1001         const AccessibilityStatusCallback& cb) {
1002   return callback_list_.Add(cb);
1003 }
1004
1005 void AccessibilityManager::NotifyAccessibilityStatusChanged(
1006     AccessibilityStatusEventDetails& details) {
1007   callback_list_.Notify(details);
1008 }
1009
1010 void AccessibilityManager::UpdateChromeOSAccessibilityHistograms() {
1011   UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosSpokenFeedback",
1012                         IsSpokenFeedbackEnabled());
1013   UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosHighContrast",
1014                         IsHighContrastEnabled());
1015   UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosVirtualKeyboard",
1016                         IsVirtualKeyboardEnabled());
1017   UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosStickyKeys", IsStickyKeysEnabled());
1018 #if !defined(USE_ATHENA)
1019   if (MagnificationManager::Get()) {
1020     uint32 type = MagnificationManager::Get()->IsMagnifierEnabled() ?
1021                       MagnificationManager::Get()->GetMagnifierType() : 0;
1022     // '0' means magnifier is disabled.
1023     UMA_HISTOGRAM_ENUMERATION("Accessibility.CrosScreenMagnifier",
1024                               type,
1025                               ui::kMaxMagnifierType + 1);
1026   }
1027 #endif
1028   if (profile_) {
1029     const PrefService* const prefs = profile_->GetPrefs();
1030     UMA_HISTOGRAM_BOOLEAN(
1031         "Accessibility.CrosLargeCursor",
1032         prefs->GetBoolean(prefs::kAccessibilityLargeCursorEnabled));
1033     UMA_HISTOGRAM_BOOLEAN(
1034         "Accessibility.CrosAlwaysShowA11yMenu",
1035         prefs->GetBoolean(prefs::kShouldAlwaysShowAccessibilityMenu));
1036
1037     bool autoclick_enabled =
1038         prefs->GetBoolean(prefs::kAccessibilityAutoclickEnabled);
1039     UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosAutoclick", autoclick_enabled);
1040     if (autoclick_enabled) {
1041       // We only want to log the autoclick delay if the user has actually
1042       // enabled autoclick.
1043       UMA_HISTOGRAM_CUSTOM_TIMES(
1044           "Accessibility.CrosAutoclickDelay",
1045           base::TimeDelta::FromMilliseconds(
1046               prefs->GetInteger(prefs::kAccessibilityAutoclickDelayMs)),
1047           base::TimeDelta::FromMilliseconds(1),
1048           base::TimeDelta::FromMilliseconds(3000),
1049           50);
1050     }
1051   }
1052 }
1053
1054 void AccessibilityManager::Observe(
1055     int type,
1056     const content::NotificationSource& source,
1057     const content::NotificationDetails& details) {
1058   switch (type) {
1059     case chrome::NOTIFICATION_LOGIN_OR_LOCK_WEBUI_VISIBLE: {
1060       // Update |profile_| when entering the login screen.
1061       Profile* profile = ProfileManager::GetActiveUserProfile();
1062       if (ProfileHelper::IsSigninProfile(profile))
1063         SetProfile(profile);
1064       break;
1065     }
1066     case chrome::NOTIFICATION_SESSION_STARTED:
1067       // Update |profile_| when entering a session.
1068       SetProfile(ProfileManager::GetActiveUserProfile());
1069
1070       // Ensure ChromeVox makes announcements at the start of new sessions.
1071       should_speak_chrome_vox_announcements_on_user_screen_ = true;
1072
1073 #if !defined(USE_ATHENA)
1074       // Add a session state observer to be able to monitor session changes.
1075       if (!session_state_observer_.get() && ash::Shell::HasInstance())
1076         session_state_observer_.reset(
1077             new ash::ScopedSessionStateObserver(this));
1078 #endif
1079       break;
1080     case chrome::NOTIFICATION_PROFILE_DESTROYED: {
1081       // Update |profile_| when exiting a session or shutting down.
1082       Profile* profile = content::Source<Profile>(source).ptr();
1083       if (profile_ == profile)
1084         SetProfile(NULL);
1085       break;
1086     }
1087     case chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED: {
1088       bool is_screen_locked = *content::Details<bool>(details).ptr();
1089       if (spoken_feedback_enabled_) {
1090         if (is_screen_locked)
1091           LoadChromeVoxToLockScreen(base::Closure());
1092         // If spoken feedback was enabled, make sure it is also enabled on
1093         // the user screen.
1094         // The status tray gets verbalized by user screen ChromeVox, so we need
1095         // to load it on the user screen even if the screen is locked.
1096         LoadChromeVoxToUserScreen(base::Closure());
1097       }
1098       break;
1099     }
1100   }
1101 }
1102
1103 void AccessibilityManager::OnBrailleDisplayStateChanged(
1104     const DisplayState& display_state) {
1105   braille_display_connected_ = display_state.available;
1106   if (braille_display_connected_) {
1107     EnableSpokenFeedback(true, ui::A11Y_NOTIFICATION_SHOW);
1108   }
1109   UpdateBrailleImeState();
1110
1111   AccessibilityStatusEventDetails details(
1112       ACCESSIBILITY_BRAILLE_DISPLAY_CONNECTION_STATE_CHANGED,
1113       braille_display_connected_,
1114       ui::A11Y_NOTIFICATION_SHOW);
1115   NotifyAccessibilityStatusChanged(details);
1116 }
1117
1118 void AccessibilityManager::OnBrailleKeyEvent(const KeyEvent& event) {
1119   // Ensure the braille IME is active on braille keyboard (dots) input.
1120   if ((event.command ==
1121        extensions::api::braille_display_private::KEY_COMMAND_DOTS) &&
1122       !braille_ime_current_) {
1123     input_method::InputMethodManager::Get()
1124         ->GetActiveIMEState()
1125         ->ChangeInputMethod(extension_misc::kBrailleImeEngineId,
1126                             false /* show_message */);
1127   }
1128 }
1129
1130 void AccessibilityManager::PostLoadChromeVox(Profile* profile) {
1131 #if !defined(USE_ATHENA)
1132   // Do any setup work needed immediately after ChromeVox actually loads.
1133   if (system_sounds_enabled_)
1134     ash::PlaySystemSoundAlways(SOUND_SPOKEN_FEEDBACK_ENABLED);
1135 #endif
1136
1137   ExtensionAccessibilityEventRouter::GetInstance()->
1138       OnChromeVoxLoadStateChanged(profile_,
1139           IsSpokenFeedbackEnabled(),
1140           chrome_vox_loaded_on_lock_screen_ ||
1141               should_speak_chrome_vox_announcements_on_user_screen_);
1142
1143   should_speak_chrome_vox_announcements_on_user_screen_ =
1144       chrome_vox_loaded_on_lock_screen_;
1145 }
1146
1147 void AccessibilityManager::PostUnloadChromeVox(Profile* profile) {
1148 #if !defined(USE_ATHENA)
1149   // Do any teardown work needed immediately after ChromeVox actually unloads.
1150   if (system_sounds_enabled_)
1151     ash::PlaySystemSoundAlways(SOUND_SPOKEN_FEEDBACK_DISABLED);
1152 #endif
1153   // Clear the accessibility focus ring.
1154   AccessibilityFocusRingController::GetInstance()->SetFocusRing(
1155       std::vector<gfx::Rect>());
1156 }
1157
1158 }  // namespace chromeos