Only call TextChanged on existing AXObjects. This avoids triggering the code which calls UpdateDist…

third_party/WebKit/Source/modules/accessibility/AXMenuListPopup.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 106 matching lines @@
 }
 
 void AXMenuListPopup::UpdateChildrenIfNecessary() {
   if (have_children_ && parent_ && parent_->NeedsToUpdateChildren())
     ClearChildren();
 
   if (!have_children_)
     AddChildren();
 }
 
-void AXMenuListPopup::DidUpdateActiveOption(int option_index) {
+void AXMenuListPopup::DidUpdateActiveOption(int option_index,
+                                            bool fire_notifications) {
   UpdateChildrenIfNecessary();
 
+  int old_index = active_index_;
+  active_index_ = option_index;
+
+  if (!fire_notifications)
+    return;
+
   AXObjectCacheImpl& cache = AxObjectCache();
-  if (active_index_ != option_index && active_index_ >= 0 &&
-      active_index_ < static_cast<int>(children_.size())) {
-    AXObjectImpl* previous_child = children_[active_index_].Get();
+  if (old_index != option_index && old_index >= 0 &&
+      old_index < static_cast<int>(children_.size())) {
+    AXObjectImpl* previous_child = children_[old_index].Get();
     cache.PostNotification(previous_child,
                            AXObjectCacheImpl::kAXMenuListItemUnselected);
   }
 
   if (option_index >= 0 && option_index < static_cast<int>(children_.size())) {
     AXObjectImpl* child = children_[option_index].Get();
     cache.PostNotification(this, AXObjectCacheImpl::kAXActiveDescendantChanged);
     cache.PostNotification(child, AXObjectCacheImpl::kAXMenuListItemSelected);
   }
-
-  active_index_ = option_index;
 }
 
 void AXMenuListPopup::DidHide() {
   AXObjectCacheImpl& cache = AxObjectCache();
   cache.PostNotification(this, AXObjectCacheImpl::kAXHide);
   if (ActiveDescendant())
     cache.PostNotification(ActiveDescendant(),
                            AXObjectCacheImpl::kAXMenuListItemUnselected);
 }
 
@@ skipping 13 matching lines @@
 }
 
 AXObjectImpl* AXMenuListPopup::ActiveDescendant() {
   if (active_index_ < 0 || active_index_ >= static_cast<int>(Children().size()))
     return nullptr;
 
   return children_[active_index_].Get();
 }
 
 }  // namespace blink