Keep track of fixed positioning in accessibility tree.

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

 /*
  * Copyright (C) 2011 Apple 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 83 matching lines @@
 
 // AXSpinButtonPart
 
 AXSpinButtonPart::AXSpinButtonPart(AXObjectCacheImpl& ax_object_cache)
     : AXMockObject(ax_object_cache), is_incrementor_(false) {}
 
 AXSpinButtonPart* AXSpinButtonPart::Create(AXObjectCacheImpl& ax_object_cache) {
   return new AXSpinButtonPart(ax_object_cache);
 }
 
-void AXSpinButtonPart::GetRelativeBounds(
+bool AXSpinButtonPart::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 (!ParentObject())
-    return;
+    return false;
 
   // FIXME: This logic should exist in the layout tree or elsewhere, but there
   // is no relationship that exists that can be queried.
+  SkMatrix44 container_transform;
+  bool is_fixed_positioned = false;
   ParentObject()->GetRelativeBounds(out_container, out_bounds_in_container,
-                                    out_container_transform);
+                                    container_transform, is_fixed_positioned);
   out_bounds_in_container = FloatRect(0, 0, out_bounds_in_container.Width(),
                                       out_bounds_in_container.Height());
   if (is_incrementor_) {
     out_bounds_in_container.SetHeight(out_bounds_in_container.Height() / 2);
   } else {
     out_bounds_in_container.SetY(out_bounds_in_container.Y() +
                                  out_bounds_in_container.Height() / 2);
     out_bounds_in_container.SetHeight(out_bounds_in_container.Height() / 2);
   }
   *out_container = ParentObject();
+  return true;
 }
 
 bool AXSpinButtonPart::Press() {
   if (!parent_ || !parent_->IsSpinButton())
     return false;
 
   AXSpinButton* spin_button = ToAXSpinButton(ParentObject());
   if (is_incrementor_)
     spin_button->Step(1);
   else
     spin_button->Step(-1);
 
   return true;
 }
 
 }  // namespace blink