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diff --git a/Source/WebCore/css/Pair.h b/Source/WebCore/css/Pair.h
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+/*
+ * (C) 1999-2003 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
+ *
+ * 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 Pair_h
+#define Pair_h
+
+#include <wtf/RefCounted.h>
+#include "CSSPrimitiveValue.h"
+#include <wtf/PassRefPtr.h>
+
+namespace WebCore {
+
+// A primitive value representing a pair.  This is useful for properties like border-radius, background-size/position,
+// and border-spacing (all of which are space-separated sets of two values).  At the moment we are only using it for
+// border-radius and background-size, but (FIXME) border-spacing and background-position could be converted over to use
+// it (eliminating some extra -webkit- internal properties).
+class Pair : public RefCounted<Pair> {
+public:
+    static PassRefPtr<Pair> create()
+    {
+        return adoptRef(new Pair);
+    }
+    static PassRefPtr<Pair> create(PassRefPtr<CSSPrimitiveValue> first, PassRefPtr<CSSPrimitiveValue> second)
+    {
+        return adoptRef(new Pair(first, second));
+    }
+    virtual ~Pair() { }
+
+    CSSPrimitiveValue* first() const { return m_first.get(); }
+    CSSPrimitiveValue* second() const { return m_second.get(); }
+
+    void setFirst(PassRefPtr<CSSPrimitiveValue> first) { m_first = first; }
+    void setSecond(PassRefPtr<CSSPrimitiveValue> second) { m_second = second; }
+
+private:
+    Pair() : m_first(0), m_second(0) { }
+    Pair(PassRefPtr<CSSPrimitiveValue> first, PassRefPtr<CSSPrimitiveValue> second)
+        : m_first(first), m_second(second) { }
+    
+    RefPtr<CSSPrimitiveValue> m_first;
+    RefPtr<CSSPrimitiveValue> m_second;
+};
+
+} // namespace
+
+#endif