Stop chromevox audio and clear focus highlight on switch to arc app

ash/common/accessibility_delegate.h

 // Copyright 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 ASH_COMMON_ACCESSIBILITY_DELEGATE_H_
 #define ASH_COMMON_ACCESSIBILITY_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/accessibility_types.h"
 #include "base/time/time.h"
@@ skipping 87 matching lines @@
 
   // Returns true when the accessibility menu should be shown.
   virtual bool ShouldShowAccessibilityMenu() const = 0;
 
   // Returns true if a braille display is connected to the system.
   virtual bool IsBrailleDisplayConnected() const = 0;
 
   // Cancel all current and queued speech immediately.
   virtual void SilenceSpokenFeedback() const = 0;
 
+  // Clear the focus highlight
+  virtual void ClearFocusHighlight() const = 0;
+
   // Saves the zoom scale of the full screen magnifier.
   virtual void SaveScreenMagnifierScale(double scale) = 0;
 
   // Gets a saved value of the zoom scale of full screen magnifier. If a value
   // is not saved, return a negative value.
   virtual double GetSavedScreenMagnifierScale() = 0;
 
   // Triggers an accessibility alert to give the user feedback.
   virtual void TriggerAccessibilityAlert(AccessibilityAlert alert) = 0;
 
   // Gets the last accessibility alert that was triggered.
   virtual AccessibilityAlert GetLastAccessibilityAlert() = 0;
 
   // 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.
   virtual void PlayEarcon(int sound_key) = 0;
 
   // Initiates play of shutdown sound and returns it's duration.
   virtual base::TimeDelta PlayShutdownSound() const = 0;
 
   // Forward an accessibility gesture from the touch exploration controller to
   // ChromeVox.
   virtual void HandleAccessibilityGesture(ui::AXGesture gesture) = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_ACCESSIBILITY_DELEGATE_H_