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diff --git a/Source/WebCore/accessibility/AccessibilityARIAGridRow.cpp b/Source/WebCore/accessibility/AccessibilityARIAGridRow.cpp
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+++ b/Source/WebCore/accessibility/AccessibilityARIAGridRow.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 "AccessibilityARIAGridRow.h"
+
+#include "AccessibilityObject.h"
+#include "AccessibilityTable.h"
+#include "RenderObject.h"
+
+using namespace std;
+
+namespace WebCore {
+    
+AccessibilityARIAGridRow::AccessibilityARIAGridRow(RenderObject* renderer)
+    : AccessibilityTableRow(renderer)
+{
+}
+
+AccessibilityARIAGridRow::~AccessibilityARIAGridRow()
+{
+}
+
+PassRefPtr<AccessibilityARIAGridRow> AccessibilityARIAGridRow::create(RenderObject* renderer)
+{
+    return adoptRef(new AccessibilityARIAGridRow(renderer));
+}
+
+bool AccessibilityARIAGridRow::isARIATreeGridRow() const
+{
+    AccessibilityObject* parent = parentTable();
+    if (!parent)
+        return false;
+    
+    return parent->ariaRoleAttribute() == TreeGridRole;
+}
+    
+void AccessibilityARIAGridRow::disclosedRows(AccessibilityChildrenVector& disclosedRows)
+{
+    // The contiguous disclosed rows will be the rows in the table that 
+    // have an aria-level of plus 1 from this row.
+    AccessibilityObject* parent = parentObjectUnignored();
+    if (!parent || !parent->isAccessibilityTable())
+        return;
+    
+    // Search for rows that match the correct level. 
+    // Only take the subsequent rows from this one that are +1 from this row's level.
+    int index = rowIndex();
+    if (index < 0)
+        return;
+    
+    unsigned level = hierarchicalLevel();
+    AccessibilityChildrenVector& allRows = static_cast<AccessibilityTable*>(parent)->rows();
+    int rowCount = allRows.size();
+    for (int k = index + 1; k < rowCount; ++k) {
+        AccessibilityObject* row = allRows[k].get();
+        // Stop at the first row that doesn't match the correct level.
+        if (row->hierarchicalLevel() != level + 1)
+            break;
+
+        disclosedRows.append(row);
+    }
+}
+    
+AccessibilityObject* AccessibilityARIAGridRow::disclosedByRow() const
+{
+    // The row that discloses this one is the row in the table
+    // that is aria-level subtract 1 from this row.
+    AccessibilityObject* parent = parentObjectUnignored();
+    if (!parent || !parent->isAccessibilityTable())
+        return 0;
+    
+    // If the level is 1 or less, than nothing discloses this row.
+    unsigned level = hierarchicalLevel();
+    if (level <= 1)
+        return 0;
+    
+    // Search for the previous row that matches the correct level.
+    int index = rowIndex();
+    AccessibilityChildrenVector& allRows = static_cast<AccessibilityTable*>(parent)->rows();
+    int rowCount = allRows.size();
+    if (index >= rowCount)
+        return 0;
+    
+    for (int k = index - 1; k >= 0; --k) {
+        AccessibilityObject* row = allRows[k].get();
+        if (row->hierarchicalLevel() == level - 1)
+            return row;
+    }
+    
+    return 0;
+}
+    
+AccessibilityObject* AccessibilityARIAGridRow::parentTable() const
+{
+    AccessibilityObject* parent = parentObjectUnignored();
+    if (!parent->isAccessibilityTable())
+        return 0;
+    
+    return parent;
+}
+
+AccessibilityObject* AccessibilityARIAGridRow::headerObject()
+{
+    AccessibilityChildrenVector rowChildren = children();
+    unsigned childrenCount = rowChildren.size();
+    for (unsigned i = 0; i < childrenCount; ++i) {
+        AccessibilityObject* cell = rowChildren[i].get();
+        if (cell->ariaRoleAttribute() == RowHeaderRole)
+            return cell;
+    }
+    
+    return 0;
+}
+
+} // namespace WebCore