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diff --git a/Source/WebCore/accessibility/AccessibilityARIAGridCell.cpp b/Source/WebCore/accessibility/AccessibilityARIAGridCell.cpp
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+++ b/Source/WebCore/accessibility/AccessibilityARIAGridCell.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 "AccessibilityARIAGridCell.h"
+
+#include "AccessibilityObject.h"
+#include "AccessibilityTableRow.h"
+
+using namespace std;
+
+namespace WebCore {
+    
+AccessibilityARIAGridCell::AccessibilityARIAGridCell(RenderObject* renderer)
+    : AccessibilityTableCell(renderer)
+{
+}
+
+AccessibilityARIAGridCell::~AccessibilityARIAGridCell()
+{
+}
+
+PassRefPtr<AccessibilityARIAGridCell> AccessibilityARIAGridCell::create(RenderObject* renderer)
+{
+    return adoptRef(new AccessibilityARIAGridCell(renderer));
+}
+
+AccessibilityObject* AccessibilityARIAGridCell::parentTable() const
+{
+    AccessibilityObject* parent = parentObjectUnignored();
+    if (!parent || !parent->isTableRow())
+        return 0;
+    
+    parent = parent->parentObjectUnignored();
+    if (!parent || !parent->isAccessibilityTable())
+        return 0;
+    
+    return parent;
+}
+    
+void AccessibilityARIAGridCell::rowIndexRange(pair<int, int>& rowRange)
+{
+    AccessibilityObject* parent = parentObjectUnignored();
+    if (!parent || !parent->isTableRow())
+        return;
+
+    // as far as I can tell, grid cells cannot span rows
+    rowRange.first = static_cast<AccessibilityTableRow*>(parent)->rowIndex();
+    rowRange.second = 1;    
+}
+
+void AccessibilityARIAGridCell::columnIndexRange(pair<int, int>& columnRange)
+{
+    AccessibilityObject* parent = parentObjectUnignored();
+    if (!parent || !parent->isTableRow())
+        return;
+    
+    AccessibilityChildrenVector siblings = parent->children();
+    unsigned childrenSize = siblings.size();
+    for (unsigned k = 0; k < childrenSize; ++k) {
+        if (siblings[k].get() == this) {
+            columnRange.first = k;
+            break;
+        }
+    }
+    
+    // as far as I can tell, grid cells cannot span columns
+    columnRange.second = 1;    
+}
+  
+} // namespace WebCore