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

ash/common/default_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_DEFAULT_ACCESSIBILITY_DELEGATE_H_
 #define ASH_COMMON_DEFAULT_ACCESSIBILITY_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/accessibility_types.h"
@@ skipping 27 matching lines @@
   bool IsCursorHighlightEnabled() const override;
   void SetFocusHighlightEnabled(bool enabled) override;
   bool IsFocusHighlightEnabled() const override;
   void SetSelectToSpeakEnabled(bool enabled) override;
   bool IsSelectToSpeakEnabled() const override;
   void SetSwitchAccessEnabled(bool enabled) override;
   bool IsSwitchAccessEnabled() const override;
   bool ShouldShowAccessibilityMenu() const override;
   bool IsBrailleDisplayConnected() const override;
   void SilenceSpokenFeedback() const override;
+  void ClearFocusHighlight() const override;
   void ToggleSpokenFeedback(
       AccessibilityNotificationVisibility notify) override;
   void SaveScreenMagnifierScale(double scale) override;
   double GetSavedScreenMagnifierScale() override;
   void TriggerAccessibilityAlert(AccessibilityAlert alert) override;
   AccessibilityAlert GetLastAccessibilityAlert() override;
   void PlayEarcon(int sound_key) override;
   base::TimeDelta PlayShutdownSound() const override;
   void HandleAccessibilityGesture(ui::AXGesture gesture) override;
 
@@ skipping 11 matching lines @@
   bool focus_highligh_enabled_ = false;
   bool select_to_speak_enabled_ = false;
   bool switch_access_enabled_ = false;
   AccessibilityAlert accessibility_alert_ = A11Y_ALERT_NONE;
   DISALLOW_COPY_AND_ASSIGN(DefaultAccessibilityDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_DEFAULT_ACCESSIBILITY_DELEGATE_H_