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

chrome/browser/ui/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.cc b/chrome/browser/ui/ash/chrome_shell_delegate.cc
index 9a533cbc7ab0f83c606f78e09ed6a67c007ce492..bb5fd25276b1cb22062a1a68fc26648aede57ec0 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.cc
@@ -35,6 +35,7 @@
 #include "chrome/browser/chromeos/policy/display_rotation_default_handler.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/system/input_device_settings.h"
+#include "chrome/browser/chromeos/ui/accessibility_focus_ring_controller.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ -259,6 +260,12 @@ class AccessibilityDelegateImpl : public ash::AccessibilityDelegate {
     TtsController::GetInstance()->Stop();
   }
 
+  void ClearFocusHighlight() const override {
+    chromeos::AccessibilityFocusRingController::GetInstance()->SetFocusRing(
+        std::vector<gfx::Rect>(),
+        chromeos::AccessibilityFocusRingController::PERSIST_FOCUS_RING);
+  }
+
   void SaveScreenMagnifierScale(double scale) override {
     if (chromeos::MagnificationManager::Get())
       chromeos::MagnificationManager::Get()->SaveScreenMagnifierScale(scale);