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diff --git a/Source/WebCore/css/StyleBuilder.h b/Source/WebCore/css/StyleBuilder.h
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+/*
+ * Copyright (C) 2011 Google 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
+ */
+
+#ifndef StyleBuilder_h
+#define StyleBuilder_h
+
+#include "CSSPropertyNames.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class CSSValue;
+class StyleBuilder;
+class StyleResolver;
+
+class PropertyHandler {
+public:
+    typedef void (*InheritFunction)(StyleResolver*);
+    typedef void (*InitialFunction)(StyleResolver*);
+    typedef void (*ApplyFunction)(StyleResolver*, CSSValue*);
+    PropertyHandler() : m_inherit(0), m_initial(0), m_apply(0) { }
+    PropertyHandler(InheritFunction inherit, InitialFunction initial, ApplyFunction apply) : m_inherit(inherit), m_initial(initial), m_apply(apply) { }
+    void applyInheritValue(StyleResolver* styleResolver) const { ASSERT(m_inherit); (*m_inherit)(styleResolver); }
+    void applyInitialValue(StyleResolver* styleResolver) const { ASSERT(m_initial); (*m_initial)(styleResolver); }
+    void applyValue(StyleResolver* styleResolver, CSSValue* value) const { ASSERT(m_apply); (*m_apply)(styleResolver, value); }
+    bool isValid() const { return m_inherit && m_initial && m_apply; }
+    InheritFunction inheritFunction() const { return m_inherit; }
+    InitialFunction initialFunction() { return m_initial; }
+    ApplyFunction applyFunction() { return m_apply; }
+private:
+    InheritFunction m_inherit;
+    InitialFunction m_initial;
+    ApplyFunction m_apply;
+};
+
+class StyleBuilder {
+    WTF_MAKE_NONCOPYABLE(StyleBuilder);
+public:
+    static const StyleBuilder& sharedStyleBuilder();
+
+    const PropertyHandler& propertyHandler(CSSPropertyID property) const
+    {
+        ASSERT(valid(property));
+        return m_propertyMap[index(property)];
+    }
+private:
+    StyleBuilder();
+    static int index(CSSPropertyID property)
+    {
+        return property - firstCSSProperty;
+    }
+
+    static bool valid(CSSPropertyID property)
+    {
+        int i = index(property);
+        return i >= 0 && i < numCSSProperties;
+    }
+
+    void setPropertyHandler(CSSPropertyID property, const PropertyHandler& handler)
+    {
+        ASSERT(valid(property));
+        ASSERT(!propertyHandler(property).isValid());
+        m_propertyMap[index(property)] = handler;
+    }
+
+    void setPropertyHandler(CSSPropertyID newProperty, CSSPropertyID equivalentProperty)
+    {
+        ASSERT(valid(newProperty));
+        ASSERT(valid(equivalentProperty));
+        ASSERT(!propertyHandler(newProperty).isValid());
+        m_propertyMap[index(newProperty)] = m_propertyMap[index(equivalentProperty)];
+    }
+
+    PropertyHandler m_propertyMap[numCSSProperties];
+};
+
+}
+
+#endif // StyleBuilder_h