Keep track of fixed positioning in accessibility tree.

content/renderer/accessibility/blink_ax_tree_source.cc

 // Copyright 2014 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 "content/renderer/accessibility/blink_ax_tree_source.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 371 matching lines @@
   dst->role = AXRoleFromBlink(src.Role());
   dst->state = AXStateFromBlink(src);
   dst->id = src.AxID();
 
   TRACE_EVENT1("accessibility", "BlinkAXTreeSource::SerializeNode", "role",
                ui::ToString(dst->role));
 
   WebAXObject offset_container;
   WebFloatRect bounds_in_container;
   SkMatrix44 container_transform;
+  bool is_fixed_positioned;
   src.GetRelativeBounds(offset_container, bounds_in_container,
-                        container_transform);
+                        container_transform, is_fixed_positioned);
   dst->location = bounds_in_container;
   if (!container_transform.isIdentity())
     dst->transform = base::WrapUnique(new gfx::Transform(container_transform));
   if (!offset_container.IsDetached())
     dst->offset_container_id = offset_container.AxID();
+  dst->is_fixed_positioned = is_fixed_positioned;
 
   AXContentNodeDataSparseAttributeAdapter sparse_attribute_adapter(dst);
   src.GetSparseAXAttributes(sparse_attribute_adapter);
 
   blink::WebAXNameFrom nameFrom;
   blink::WebVector<WebAXObject> nameObjects;
   blink::WebString web_name = src.GetName(nameFrom, nameObjects);
   if ((!web_name.IsEmpty() && !web_name.IsNull()) ||
       nameFrom == blink::kWebAXNameFromAttributeExplicitlyEmpty) {
     dst->AddStringAttribute(ui::AX_ATTR_NAME, web_name.Utf8());
@@ skipping 481 matching lines @@
     return WebAXObject();
 
   WebDocument document = render_frame_->GetWebFrame()->GetDocument();
   if (!document.IsNull())
     return WebAXObject::FromWebDocument(document);
 
   return WebAXObject();
 }
 
 }  // namespace content