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

third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.h

 /*
  * Copyright (C) 2014, Google 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
@@ skipping 236 matching lines @@
   HeapVector<std::pair<Member<AXObjectImpl>, AXNotification>>
       notifications_to_post_;
   void NotificationPostTimerFired(TimerBase*);
 
   AXObjectImpl* FocusedImageMapUIElement(HTMLAreaElement*);
 
   AXID GetOrCreateAXID(AXObjectImpl*);
 
   void TextChanged(Node*);
   bool NodeIsTextControl(const Node*);
+  AXObjectImpl* NearestExistingAncestor(Node*);
 
   Settings* GetSettings();
 };
 
 // This is the only subclass of AXObjectCache.
 DEFINE_TYPE_CASTS(AXObjectCacheImpl, AXObjectCache, cache, true, true);
 
 bool NodeHasRole(Node*, const String& role);
 // This will let you know if aria-hidden was explicitly set to false.
 bool IsNodeAriaVisible(Node*);
 
 }  // namespace blink
 
 #endif