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diff --git a/WebCore/rendering/VerticalPositionCache.h b/WebCore/rendering/VerticalPositionCache.h
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+/*
+ * Copyright (C) 2010 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.
+ *
+ * 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 VerticalPositionCache_h
+#define VerticalPositionCache_h
+
+#include "FontBaseline.h"
+#include <wtf/HashMap.h>
+
+namespace WebCore {
+
+class RenderObject;
+
+// Values for vertical alignment.
+const int PositionTop = -0x7fffffff;
+const int PositionBottom = 0x7fffffff;
+const int PositionUndefined = 0x80000000;
+
+class VerticalPositionCache : public Noncopyable {
+public:
+    VerticalPositionCache()
+    { }
+    
+    int get(RenderObject* renderer, FontBaseline baselineType) const
+    {
+        const HashMap<RenderObject*, int>& mapToCheck = baselineType == AlphabeticBaseline ? m_alphabeticPositions : m_ideographicPositions;
+        const HashMap<RenderObject*, int>::const_iterator it = mapToCheck.find(renderer);
+        if (it == mapToCheck.end())
+            return PositionUndefined;
+        return it->second;
+    }
+    
+    void set(RenderObject* renderer, FontBaseline baselineType, int position)
+    {
+        if (baselineType == AlphabeticBaseline)
+            m_alphabeticPositions.set(renderer, position);
+        else
+            m_ideographicPositions.set(renderer, position);
+    }
+
+private:
+    HashMap<RenderObject*, int> m_alphabeticPositions;
+    HashMap<RenderObject*, int> m_ideographicPositions;
+};
+
+} // namespace WebCore
+
+#endif // VerticalPositionCache_h