Keep track of fixed positioning in accessibility tree.

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

 /*
  * 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 38 matching lines @@
   return new AXInlineTextBox(std::move(inline_text_box), ax_object_cache);
 }
 
 void AXInlineTextBox::Init() {}
 
 void AXInlineTextBox::Detach() {
   AXObject::Detach();
   inline_text_box_ = nullptr;
 }
 
-void AXInlineTextBox::GetRelativeBounds(
+bool AXInlineTextBox::GetSimpleRelativeBounds(
     AXObject** out_container,
-    FloatRect& out_bounds_in_container,
-    SkMatrix44& out_container_transform) const {
+    FloatRect& out_bounds_in_container) const {
   *out_container = nullptr;
   out_bounds_in_container = FloatRect();
-  out_container_transform.setIdentity();
 
   if (!inline_text_box_ || !ParentObject() ||
       !ParentObject()->GetLayoutObject())
-    return;
+    return false;
 
   *out_container = ParentObject();
   out_bounds_in_container = FloatRect(inline_text_box_->LocalBounds());
 
   // Subtract the local bounding box of the parent because they're
   // both in the same coordinate system.
   LayoutObject* parent_layout_object = ParentObject()->GetLayoutObject();
   FloatRect parent_bounding_box =
       parent_layout_object->LocalBoundingBoxRectForAccessibility();
   out_bounds_in_container.MoveBy(-parent_bounding_box.Location());
+  return true;
 }
 
 bool AXInlineTextBox::ComputeAccessibilityIsIgnored(
     IgnoredReasons* ignored_reasons) const {
   AXObject* parent = ParentObject();
   if (!parent)
     return false;
 
   if (!parent->AccessibilityIsIgnored())
     return false;
@@ skipping 89 matching lines @@
   if (previous_on_line)
     return ax_object_cache_->GetOrCreate(previous_on_line.Get());
 
   if (!inline_text_box_->IsFirst())
     return 0;
 
   return ParentObject()->PreviousOnLine();
 }
 
 }  // namespace blink