Keep track of fixed positioning in accessibility tree.

ui/accessibility/ax_tree.cc

 // Copyright 2013 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 "ui/accessibility/ax_tree.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 181 matching lines @@
     auto* container = GetFromId(node->data().offset_container_id);
     if (!container) {
       if (node == root())
         container = node->parent();
       else
         container = root();
     }
     if (!container || container == node)
       break;
 
-    gfx::RectF container_bounds = container->data().location;
+    const ui::AXNodeData& container_data = container->data();
+    gfx::RectF container_bounds = container_data.location;
     bounds.Offset(container_bounds.x(), container_bounds.y());
 
-    int scroll_x = 0;
-    int scroll_y = 0;
-    if (container->data().GetIntAttribute(ui::AX_ATTR_SCROLL_X, &scroll_x) &&
-        container->data().GetIntAttribute(ui::AX_ATTR_SCROLL_Y, &scroll_y)) {
-      bounds.Offset(-scroll_x, -scroll_y);
+    if (!node->data().is_fixed_positioned) {
+      int scroll_x = 0;
+      int scroll_y = 0;
+      if (container_data.GetIntAttribute(ui::AX_ATTR_SCROLL_X, &scroll_x) &&
+          container_data.GetIntAttribute(ui::AX_ATTR_SCROLL_Y, &scroll_y)) {
+        bounds.Offset(-scroll_x, -scroll_y);
+      }
     }
 
     node = container;
   }
 
   return bounds;
 }
 
 gfx::RectF AXTree::GetTreeBounds(const AXNode* node) const {
   return RelativeToTreeBounds(node, gfx::RectF());
@@ skipping 346 matching lines @@
       update_state->pending_nodes.insert(child);
       update_state->new_nodes.insert(child);
     }
     new_children->push_back(child);
   }
 
   return success;
 }
 
 }  // namespace ui