Set keys to traverse accessibility tree. Using focus ring to highlight selected node.

chrome/browser/chromeos/accessibility/accessibility_manager.cc

 // Copyright (c) 2013 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/chromeos/accessibility/accessibility_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 23 matching lines @@
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/accessibility/accessibility_extension_api.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_extension_loader.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_highlight_manager.h"
 #include "chrome/browser/chromeos/accessibility/magnification_manager.h"
 #include "chrome/browser/chromeos/accessibility/select_to_speak_event_handler.h"
+#include "chrome/browser/chromeos/accessibility/switch_access_event_handler.h"
 #include "chrome/browser/chromeos/app_mode/kiosk_app_manager.h"
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/ui/accessibility_focus_ring_controller.h"
 #include "chrome/browser/extensions/api/braille_display_private/stub_braille_controller.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/ash/ash_util.h"
@@ skipping 879 matching lines @@
 
   const bool enabled = profile_->GetPrefs()->GetBoolean(
       prefs::kAccessibilitySwitchAccessEnabled);
 
   if (switch_access_enabled_ == enabled)
     return;
   switch_access_enabled_ = enabled;
 
   if (enabled) {
     switch_access_loader_->Load(profile_, base::Closure() /* done_cb */);
+    switch_access_event_handler_.reset(
+        new chromeos::SwitchAccessEventHandler());
   } else {
     switch_access_loader_->Unload();
+    switch_access_event_handler_.reset(nullptr);
   }
 }
 
 void AccessibilityManager::UpdateAccessibilityHighlightingFromPrefs() {
   if (!focus_highlight_enabled_ && !caret_highlight_enabled_ &&
       !cursor_highlight_enabled_) {
     if (accessibility_highlight_manager_)
       accessibility_highlight_manager_.reset();
     return;
   }
@@ skipping 445 matching lines @@
     content::BrowserContext* context) {
   keyboard_listener_extension_id_ = id;
 
   extensions::ExtensionRegistry* registry =
       extensions::ExtensionRegistry::Get(context);
   if (!extension_registry_observer_.IsObserving(registry) && !id.empty())
     extension_registry_observer_.Add(registry);
 }
 
 }  // namespace chromeos