Fix accessibility of buttons inside Chrome menu

ui/views/controls/menu/menu_controller.cc

 // Copyright (c) 2012 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.
 
 #include "ui/views/controls/menu/menu_controller.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 2650 matching lines @@
     return;
   SetSelection(item, SELECTION_DEFAULT);
   View* hot_view =
       GetInitialFocusableView(item, direction == INCREMENT_SELECTION_DOWN);
   SetHotTrackedButton(CustomButton::AsCustomButton(hot_view));
 }
 
 void MenuController::SetHotTrackedButton(CustomButton* hot_button) {
   if (hot_button == hot_button_) {
     // Hot-tracked state may change outside of the MenuController. Correct it.
-    if (hot_button && !hot_button->IsHotTracked())
+    if (hot_button && !hot_button->IsHotTracked()) {
       hot_button->SetHotTracked(true);
+      hot_button->NotifyAccessibilityEvent(ui::AX_EVENT_SELECTION, true);
+    }
     return;
   }
   if (hot_button_)
     hot_button_->SetHotTracked(false);
   hot_button_ = hot_button;
-  if (hot_button)
+  if (hot_button) {
     hot_button->SetHotTracked(true);
+    hot_button->NotifyAccessibilityEvent(ui::AX_EVENT_SELECTION, true);
+  }
 }
 
 }  // namespace views