Automatically fire AX events on Win based on tree changes

third_party/WebKit/Source/core/dom/AccessibleNode.cpp

 // Copyright 2017 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 "core/dom/AccessibleNode.h"
 
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/AccessibleNodeList.h"
 #include "core/dom/Element.h"
 #include "core/dom/QualifiedName.h"
@@ skipping 365 matching lines @@
     return attr_value;
   }
 
   if (is_token_attr && IsUndefinedAttrValue(result))
     return g_null_atom;  // Property specifically set to undefined value.
 
   return result;
 }
 
 // static
-AccessibleNode* AccessibleNode::GetPropertyOrARIAAttribute(
+Element* AccessibleNode::GetPropertyOrARIAAttribute(
     Element* element,
     AOMRelationProperty property) {
   if (!element)
     return nullptr;
 
   if (AccessibleNode* result = GetProperty(element, property))
-    return result;
+    return result->element();
 
   // Fall back on the equivalent ARIA attribute.
   QualifiedName attribute = GetCorrespondingARIAAttribute(property);
   AtomicString value = element->FastGetAttribute(attribute);
-  Element* target = element->GetTreeScope().getElementById(value);
-  if (!target)
-    return nullptr;
-
-  return target->accessibleNode();
+  return element->GetTreeScope().getElementById(value);
 }
 
 // static
 bool AccessibleNode::GetPropertyOrARIAAttribute(
     Element* element,
     AOMRelationListProperty property,
     HeapVector<Member<Element>>& targets) {
   if (!element)
     return false;
 
@@ skipping 694 matching lines @@
   return element_->GetDocument().ExistingAXObjectCache();
 }
 
 DEFINE_TRACE(AccessibleNode) {
   visitor->Trace(element_);
   visitor->Trace(relation_properties_);
   visitor->Trace(relation_list_properties_);
 }
 
 }  // namespace blink