Keep track of fixed positioning in accessibility tree.

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

 /*
  * Copyright (C) 2013, 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 41 matching lines @@
   void Detach() override;
   bool IsDetached() const override { return !inline_text_box_; }
   bool IsAXInlineTextBox() const override { return true; }
 
  public:
   AccessibilityRole RoleValue() const override { return kInlineTextBoxRole; }
   String GetName(AXNameFrom&,
                  AXObject::AXObjectVector* name_objects) const override;
   void TextCharacterOffsets(Vector<int>&) const override;
   void GetWordBoundaries(Vector<AXRange>&) const override;
-  void GetRelativeBounds(AXObject** out_container,
-                         FloatRect& out_bounds_in_container,
-                         SkMatrix44& out_container_transform) const override;
+  bool GetSimpleRelativeBounds(
+      AXObject** out_container,
+      FloatRect& out_bounds_in_container) const override;
   AXObject* ComputeParent() const override;
   AccessibilityTextDirection GetTextDirection() const override;
   Node* GetNode() const override { return inline_text_box_->GetNode(); }
   AXObject* NextOnLine() const override;
   AXObject* PreviousOnLine() const override;
 
  private:
   RefPtr<AbstractInlineTextBox> inline_text_box_;
 
   bool ComputeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const override;
 };
 
 }  // namespace blink
 
 #endif  // AXInlineTextBox_h