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diff --git a/Source/WebCore/platform/graphics/FontMetrics.h b/Source/WebCore/platform/graphics/FontMetrics.h
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+++ b/Source/WebCore/platform/graphics/FontMetrics.h
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+/*
+ * Copyright (C) Research In Motion Limited 2010-2011. 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 FontMetrics_h
+#define FontMetrics_h
+
+#include <wtf/MathExtras.h>
+
+namespace WebCore {
+
+const unsigned gDefaultUnitsPerEm = 1000;
+
+class FontMetrics {
+public:
+    FontMetrics()
+        : m_unitsPerEm(gDefaultUnitsPerEm)
+        , m_ascent(0)
+        , m_descent(0)
+        , m_lineGap(0)
+        , m_lineSpacing(0)
+        , m_xHeight(0)
+    {
+    }
+
+    unsigned unitsPerEm() const { return m_unitsPerEm; }
+    void setUnitsPerEm(unsigned unitsPerEm) { m_unitsPerEm = unitsPerEm; }
+
+    float floatAscent(FontBaseline baselineType = AlphabeticBaseline) const
+    {
+        if (baselineType == AlphabeticBaseline)
+            return m_ascent;
+        return floatHeight() / 2;
+    }
+
+    void setAscent(float ascent) { m_ascent = ascent; }
+
+    float floatDescent(FontBaseline baselineType = AlphabeticBaseline) const
+    {
+        if (baselineType == AlphabeticBaseline)
+            return m_descent;
+        return floatHeight() / 2;
+    }
+
+    void setDescent(float descent) { m_descent = descent; }
+
+    float floatHeight(FontBaseline baselineType = AlphabeticBaseline) const
+    {
+        return floatAscent(baselineType) + floatDescent(baselineType);
+    }
+
+    float floatLineGap() const { return m_lineGap; }
+    void setLineGap(float lineGap) { m_lineGap = lineGap; }
+
+    float floatLineSpacing() const { return m_lineSpacing; }
+    void setLineSpacing(float lineSpacing) { m_lineSpacing = lineSpacing; }
+
+    float xHeight() const { return m_xHeight; }
+    void setXHeight(float xHeight) { m_xHeight = xHeight; }
+
+    // Integer variants of certain metrics, used for HTML rendering.
+    int ascent(FontBaseline baselineType = AlphabeticBaseline) const
+    {
+        if (baselineType == AlphabeticBaseline)
+            return lroundf(m_ascent);
+        return height() - height() / 2;
+    }
+
+    int descent(FontBaseline baselineType = AlphabeticBaseline) const
+    {
+        if (baselineType == AlphabeticBaseline)
+            return lroundf(m_descent);
+        return height() / 2;
+    }
+
+    int height(FontBaseline baselineType = AlphabeticBaseline) const
+    {
+        return ascent(baselineType) + descent(baselineType);
+    }
+
+    int lineGap() const { return lroundf(m_lineGap); }
+    int lineSpacing() const { return lroundf(m_lineSpacing); }
+
+private:
+    friend class SimpleFontData;
+
+    void reset()
+    {
+        m_unitsPerEm = gDefaultUnitsPerEm;
+        m_ascent = 0;
+        m_descent = 0;
+        m_lineGap = 0;
+        m_lineSpacing = 0;
+        m_xHeight = 0;
+    }
+
+    unsigned m_unitsPerEm;
+    float m_ascent;
+    float m_descent;
+    float m_lineGap;
+    float m_lineSpacing;
+    float m_xHeight;
+};
+
+} // namespace WebCore
+
+#endif // FontMetrics_h