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

chrome/browser/chromeos/accessibility/accessibility_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_
 
 #include <set>
 
 #include "ash/common/accessibility_types.h"
@@ skipping 19 matching lines @@
 
 namespace gfx {
 class Rect;
 }  // namespace gfx
 
 namespace chromeos {
 
 class AccessibilityExtensionLoader;
 class AccessibilityHighlightManager;
 class SelectToSpeakEventHandler;
+class SwitchAccessEventHandler;
 
 enum AccessibilityNotificationType {
   ACCESSIBILITY_MANAGER_SHUTDOWN,
   ACCESSIBILITY_TOGGLE_HIGH_CONTRAST_MODE,
   ACCESSIBILITY_TOGGLE_LARGE_CURSOR,
   ACCESSIBILITY_TOGGLE_SCREEN_MAGNIFIER,
   ACCESSIBILITY_TOGGLE_SPOKEN_FEEDBACK,
   ACCESSIBILITY_TOGGLE_VIRTUAL_KEYBOARD,
   ACCESSIBILITY_TOGGLE_MONO_AUDIO,
   ACCESSIBILITY_BRAILLE_DISPLAY_CONNECTION_STATE_CHANGED
@@ skipping 364 matching lines @@
 
   std::unique_ptr<AccessibilityExtensionLoader> chromevox_loader_;
 
   std::unique_ptr<AccessibilityExtensionLoader> select_to_speak_loader_;
 
   std::unique_ptr<chromeos::SelectToSpeakEventHandler>
       select_to_speak_event_handler_;
 
   std::unique_ptr<AccessibilityExtensionLoader> switch_access_loader_;
 
+  std::unique_ptr<chromeos::SwitchAccessEventHandler>
+      switch_access_event_handler_;
+
   base::WeakPtrFactory<AccessibilityManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AccessibilityManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_