Table headers are not retrieved properly by Accessibility API

Source/modules/accessibility/AXTableColumn.cpp

 /*
  * Copyright (C) 2008 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 34 matching lines @@
 
 AXTableColumn::~AXTableColumn()
 {
 }
 
 PassRefPtr<AXTableColumn> AXTableColumn::create(AXObjectCacheImpl* axObjectCache)
 {
     return adoptRef(new AXTableColumn(axObjectCache));
 }
 
+
 void AXTableColumn::setParent(AXObject* parent)
 {
     AXMockObject::setParent(parent);
 
     clearChildren();
 }
 
 LayoutRect AXTableColumn::elementRect() const
 {
     // this will be filled in when addChildren is called
     return m_columnRect;
 }
 
+void AXTableColumn::headerObjectsForColumn(AccessibilityChildrenVector& headers)
+{
+    if (!m_parent)
+        return;
+
+    RenderObject* renderer = m_parent->renderer();
+    if (!renderer || !renderer->isTable())
+        return;
+
+    RenderTable* table = toRenderTable(renderer);
+    RenderTableSection* tableSection = table->topSection();
+    for (; tableSection; tableSection = table->sectionBelow(tableSection, SkipEmptySections)) {
+        unsigned numRows = tableSection->numRows();
+        for (unsigned r = 0; r < numRows; r++) {
+            RenderTableCell* renderCell = tableSection->primaryCellAt(r, m_columnIndex);
+            if (!renderCell)
+                continue;
+
+            // Whenever cell's col is less then current column index, we've found the cell with colspan.
+            // We do not need to add this cell, it's already been added.
+            if (renderCell->col() < m_columnIndex)
+                continue;
+
+            AXObject* cell = axObjectCache()->getOrCreate(renderCell->node());
+            if (!cell)
+                continue;
+
+            if (toAXTableCell(cell)->scanToDecideHeaderRole() == ColumnHeaderRole)
+                headers.append(cell);
+        }
+    }
+}
+
 AXObject* AXTableColumn::headerObject()
 {
     if (!m_parent)
         return 0;
 
     RenderObject* renderer = m_parent->renderer();
     if (!renderer)
         return 0;
 
     if (!m_parent->isAXTable())
@@ skipping 98 matching lines @@
         // make sure the last one isn't the same as this one (rowspan cells)
         if (m_children.size() > 0 && m_children.last() == cell)
             continue;
 
         m_children.append(cell);
         m_columnRect.unite(cell->elementRect());
     }
 }
 
 } // namespace blink