Re-land: Toggle spoken feedback if two fingers are held down.

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 232 matching lines @@
   std::unique_ptr<AccessibilityStatusSubscription> RegisterCallback(
       const AccessibilityStatusCallback& cb);
 
   // Notify registered callbacks of a status change in an accessibility setting.
   void NotifyAccessibilityStatusChanged(
       AccessibilityStatusEventDetails& details);
 
   // Notify accessibility when locale changes occur.
   void OnLocaleChanged();
 
+  // Whether or not to enable toggling spoken feedback via holding down
+  // two fingers on the screen.
+  bool ShouldToggleSpokenFeedbackViaTouch();
+
+  // Play tick sound indicating spoken feedback will be toggled after countdown.
+  bool PlaySpokenFeedbackToggleCountdown(int tick_count);
+
   // Plays an earcon. Earcons are brief and distinctive sounds that indicate
   // when their mapped event has occurred. The sound key enums can be found in
   // chromeos/audio/chromeos_sounds.h.
   bool PlayEarcon(int sound_key, PlaySoundOption option);
 
   // Forward an accessibility gesture from the touch exploration controller
   // to ChromeVox.
   void HandleAccessibilityGesture(ui::AXGesture gesture);
 
   // Update the touch exploration controller so that synthesized
@@ skipping 151 matching lines @@
       select_to_speak_event_handler_;
 
   base::WeakPtrFactory<AccessibilityManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AccessibilityManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_