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diff --git a/Source/WebCore/svg/properties/SVGAnimatedPropertyDescription.h b/Source/WebCore/svg/properties/SVGAnimatedPropertyDescription.h
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+++ b/Source/WebCore/svg/properties/SVGAnimatedPropertyDescription.h
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+/*
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
+ * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
+ * Copyright (C) Research In Motion Limited 2010. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef SVGAnimatedPropertyDescription_h
+#define SVGAnimatedPropertyDescription_h
+
+#if ENABLE(SVG)
+#include <wtf/HashMap.h>
+#include <wtf/text/AtomicString.h>
+
+namespace WebCore {
+
+class SVGElement;
+
+struct SVGAnimatedPropertyDescription {            
+    // Empty value
+    SVGAnimatedPropertyDescription()
+        : m_element(0)
+        , m_attributeName(0)
+    {
+    }
+
+    // Deleted value
+    SVGAnimatedPropertyDescription(WTF::HashTableDeletedValueType)
+        : m_element(reinterpret_cast<SVGElement*>(-1))
+    {
+    }
+
+    bool isHashTableDeletedValue() const
+    {
+        return m_element == reinterpret_cast<SVGElement*>(-1);
+    }
+
+    SVGAnimatedPropertyDescription(SVGElement* element, const AtomicString& attributeName)
+        : m_element(element)
+        , m_attributeName(attributeName.impl())
+    {
+        ASSERT(m_element);
+        ASSERT(m_attributeName);
+    }
+
+    bool operator==(const SVGAnimatedPropertyDescription& other) const
+    {
+        return m_element == other.m_element && m_attributeName == other.m_attributeName;
+    }
+
+    SVGElement* m_element;
+    AtomicStringImpl* m_attributeName;
+};
+
+struct SVGAnimatedPropertyDescriptionHash {
+    static unsigned hash(const SVGAnimatedPropertyDescription& key)
+    {
+        return WTF::StringHasher::createBlobHash<sizeof(SVGAnimatedPropertyDescription)>(&key);
+    }
+
+    static bool equal(const SVGAnimatedPropertyDescription& a, const SVGAnimatedPropertyDescription& b)
+    {
+        return a == b;
+    }
+
+    static const bool safeToCompareToEmptyOrDeleted = true;
+};
+
+struct SVGAnimatedPropertyDescriptionHashTraits : WTF::GenericHashTraits<SVGAnimatedPropertyDescription> {
+    static const bool emptyValueIsZero = true;
+
+    static void constructDeletedValue(SVGAnimatedPropertyDescription& slot)
+    {
+        new (&slot) SVGAnimatedPropertyDescription(WTF::HashTableDeletedValue);
+    }
+
+    static bool isDeletedValue(const SVGAnimatedPropertyDescription& value)
+    {
+        return value.isHashTableDeletedValue();
+    }
+};
+ 
+}
+
+#endif // ENABLE(SVG)
+#endif // SVGAnimatedPropertyDescription_h