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diff --git a/Source/WebCore/html/StepRange.h b/Source/WebCore/html/StepRange.h
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+/*
+ * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. 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 StepRange_h
+#define StepRange_h
+
+#include <wtf/Forward.h>
+#include <wtf/Noncopyable.h>
+
+namespace WebCore {
+
+class HTMLInputElement;
+
+class StepRange {
+    WTF_MAKE_NONCOPYABLE(StepRange);
+public:
+    bool hasStep;
+    double step;
+    double minimum;
+    double maximum; // maximum must be >= minimum.
+
+    explicit StepRange(const HTMLInputElement*);
+    double clampValue(double value);
+    double clampValue(const String& stringValue);
+
+    // Clamp the middle value according to the step
+    double defaultValue()
+    {
+        return clampValue((minimum + maximum) / 2);
+    }
+
+    // Map value into 0-1 range
+    double proportionFromValue(double value)
+    {
+        if (minimum == maximum)
+            return 0;
+
+        return (value - minimum) / (maximum - minimum);
+    }
+
+    // Map from 0-1 range to value
+    double valueFromProportion(double proportion)
+    {
+        return minimum + proportion * (maximum - minimum);
+    }
+
+    double valueFromElement(HTMLInputElement*, bool* wasClamped = 0);
+};
+
+}
+
+#endif // StepRange_h