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diff --git a/Source/WebCore/accessibility/AccessibilityARIAGrid.cpp b/Source/WebCore/accessibility/AccessibilityARIAGrid.cpp
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+++ b/Source/WebCore/accessibility/AccessibilityARIAGrid.cpp
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+/*
+ * Copyright (C) 2009 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
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "AccessibilityARIAGrid.h"
+
+#include "AXObjectCache.h"
+#include "AccessibilityTableCell.h"
+#include "AccessibilityTableColumn.h"
+#include "AccessibilityTableHeaderContainer.h"
+#include "AccessibilityTableRow.h"
+#include "RenderObject.h"
+
+using namespace std;
+
+namespace WebCore {
+
+AccessibilityARIAGrid::AccessibilityARIAGrid(RenderObject* renderer)
+    : AccessibilityTable(renderer)
+{
+#if ACCESSIBILITY_TABLES
+    m_isAccessibilityTable = true;
+#else
+    m_isAccessibilityTable = false;
+#endif
+}
+
+AccessibilityARIAGrid::~AccessibilityARIAGrid()
+{
+}
+
+PassRefPtr<AccessibilityARIAGrid> AccessibilityARIAGrid::create(RenderObject* renderer)
+{
+    return adoptRef(new AccessibilityARIAGrid(renderer));
+}
+
+void AccessibilityARIAGrid::addChild(AccessibilityObject* child, HashSet<AccessibilityObject*>& appendedRows, unsigned& columnCount)
+{
+    if (!child || !child->isTableRow() || child->ariaRoleAttribute() != RowRole)
+        return;
+        
+    AccessibilityTableRow* row = static_cast<AccessibilityTableRow*>(child);
+    if (appendedRows.contains(row))
+        return;
+        
+    // store the maximum number of columns
+    unsigned rowCellCount = row->children().size();
+    if (rowCellCount > columnCount)
+        columnCount = rowCellCount;
+    
+    row->setRowIndex((int)m_rows.size());        
+    m_rows.append(row);
+    m_children.append(row);
+    appendedRows.add(row);
+}
+    
+void AccessibilityARIAGrid::addChildren()
+{
+    ASSERT(!m_haveChildren); 
+    
+    if (!isAccessibilityTable()) {
+        AccessibilityRenderObject::addChildren();
+        return;
+    }
+    
+    m_haveChildren = true;
+    if (!m_renderer)
+        return;
+    
+    AXObjectCache* axCache = m_renderer->document()->axObjectCache();
+    
+    // add only rows that are labeled as aria rows
+    HashSet<AccessibilityObject*> appendedRows;
+    unsigned columnCount = 0;
+    for (RefPtr<AccessibilityObject> child = firstChild(); child; child = child->nextSibling()) {
+
+        // in case the render tree doesn't match the expected ARIA hierarchy, look at the children
+        if (child->accessibilityIsIgnored()) {
+            if (!child->hasChildren())
+                child->addChildren();
+            
+            AccessibilityChildrenVector children = child->children();
+            unsigned length = children.size();
+            for (unsigned i = 0; i < length; ++i)
+                addChild(children[i].get(), appendedRows, columnCount);
+        } else
+            addChild(child.get(), appendedRows, columnCount);            
+    }
+    
+    // make the columns based on the number of columns in the first body
+    for (unsigned i = 0; i < columnCount; ++i) {
+        AccessibilityTableColumn* column = static_cast<AccessibilityTableColumn*>(axCache->getOrCreate(ColumnRole));
+        column->setColumnIndex((int)i);
+        column->setParentTable(this);
+        m_columns.append(column);
+        if (!column->accessibilityIsIgnored())
+            m_children.append(column);
+    }
+    
+    AccessibilityObject* headerContainerObject = headerContainer();
+    if (headerContainerObject && !headerContainerObject->accessibilityIsIgnored())
+        m_children.append(headerContainerObject);
+}
+    
+AccessibilityTableCell* AccessibilityARIAGrid::cellForColumnAndRow(unsigned column, unsigned row)
+{
+    if (!m_renderer)
+        return 0;
+    
+    updateChildrenIfNecessary();
+    
+    if (column >= columnCount() || row >= rowCount())
+        return 0;
+    
+    AccessibilityObject* tableRow = m_rows[row].get();
+    if (!tableRow)
+        return 0;
+    
+    AccessibilityChildrenVector children = tableRow->children();
+    // in case this row had fewer columns than other rows
+    AccessibilityObject* tableCell = 0;
+    if (column >= children.size())
+        return 0;
+
+    tableCell = children[column].get();
+    return static_cast<AccessibilityTableCell*>(tableCell);
+}
+    
+} // namespace WebCore