Keep track of fixed positioning in accessibility tree.

ui/accessibility/ax_node.h

 // 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.
 
 #ifndef UI_ACCESSIBILITY_AX_NODE_H_
 #define UI_ACCESSIBILITY_AX_NODE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 31 matching lines @@
 
   // Update this node's location. This is separate from SetData just because
   // changing only the location is common and should be more efficient than
   // re-copying all of the data.
   //
   // The node's location is stored as a relative bounding box, the ID of
   // the element it's relative to, and an optional transformation matrix.
   // See ax_node_data.h for details.
   void SetLocation(int offset_container_id,
                    const gfx::RectF& location,
-                   gfx::Transform* transform);
+                   gfx::Transform* transform,
+                   bool is_fixed_positioned);
 
   // Set the index in parent, for example if siblings were inserted or deleted.
   void SetIndexInParent(int index_in_parent);
 
   // Swap the internal children vector with |children|. This instance
   // now owns all of the passed children.
   void SwapChildren(std::vector<AXNode*>& children);
 
   // This is called when the AXTree no longer includes this node in the
   // tree. Reference counting is used on some platforms because the
@@ skipping 17 matching lines @@
 
   int index_in_parent_;
   AXNode* parent_;
   std::vector<AXNode*> children_;
   AXNodeData data_;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_AX_NODE_H_