Fire accessibilityPrivate events on two-finger hold gesture.

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/accessibility_types.h"
@@ skipping 242 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();
 
+  // Called when we first detect two fingers are held down, which can be
+  // used to toggle spoken feedback on some touch-only devices.
+  void OnTwoFingerTouchStart();
+
+  // Called when the user is no longer holding down two fingers (including
+  // releasing one, holding down three, or moving them).
+  void OnTwoFingerTouchStop();
+
   // 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);
 
   // Notify that a view is focused in arc.
   void OnViewFocusedInArc(const gfx::Rect& bounds_in_screen);
 
@@ skipping 174 matching lines @@
       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_