Keep track of fixed positioning in accessibility tree.

third_party/WebKit/Source/modules/exported/WebAXObject.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1489 matching lines @@
 
 void WebAXObject::SetScrollOffset(const WebPoint& offset) const {
   if (IsDetached())
     return;
 
   private_->SetScrollOffset(offset);
 }
 
 void WebAXObject::GetRelativeBounds(WebAXObject& offset_container,
                                     WebFloatRect& bounds_in_container,
-                                    SkMatrix44& container_transform) const {
+                                    SkMatrix44& container_transform,
+                                    bool& is_fixed_positioned) const {
   if (IsDetached())
     return;
 
 #if DCHECK_IS_ON()
   DCHECK(IsLayoutClean(private_->GetDocument()));
 #endif
 
   AXObject* container = nullptr;
   FloatRect bounds;
-  private_->GetRelativeBounds(&container, bounds, container_transform);
+  private_->GetRelativeBounds(&container, bounds, container_transform,
+                              is_fixed_positioned);
   offset_container = WebAXObject(container);
   bounds_in_container = WebFloatRect(bounds);
 }
 
 void WebAXObject::ScrollToMakeVisible() const {
   if (!IsDetached())
     private_->ScrollToMakeVisible();
 }
 
 void WebAXObject::ScrollToMakeVisibleWithSubFocus(
@@ skipping 47 matching lines @@
 
 // static
 WebAXObject WebAXObject::FromWebDocumentFocused(
     const WebDocument& web_document) {
   const Document* document = web_document.ConstUnwrap<Document>();
   AXObjectCacheImpl* cache = ToAXObjectCacheImpl(document->AxObjectCache());
   return cache ? WebAXObject(cache->FocusedObject()) : WebAXObject();
 }
 
 }  // namespace blink