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diff --git a/Source/WebCore/rendering/svg/SVGTextLayoutEngineBaseline.h b/Source/WebCore/rendering/svg/SVGTextLayoutEngineBaseline.h
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+++ b/Source/WebCore/rendering/svg/SVGTextLayoutEngineBaseline.h
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+/*
+ * Copyright (C) Research In Motion Limited 2010. 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 SVGTextLayoutEngineBaseline_h
+#define SVGTextLayoutEngineBaseline_h
+
+#if ENABLE(SVG)
+#include "SVGRenderStyleDefs.h"
+#include <wtf/Noncopyable.h>
+
+namespace WebCore {
+
+class Font;
+class RenderObject;
+class SVGElement;
+class SVGRenderStyle;
+class SVGTextMetrics;
+
+// Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' / 'dominant-baseline' and 'baseline-shift'.
+class SVGTextLayoutEngineBaseline : public Noncopyable {
+public:
+    SVGTextLayoutEngineBaseline(const Font&);
+
+    float calculateBaselineShift(const SVGRenderStyle*, SVGElement* lengthContext) const;
+    float calculateAlignmentBaselineShift(bool isVerticalText, const RenderObject* textRenderer) const;
+    float calculateGlyphOrientationAngle(bool isVerticalText, const SVGRenderStyle*, const UChar& character) const;
+    float calculateGlyphAdvanceAndOrientation(bool isVerticalText, SVGTextMetrics&, float angle, float& xOrientationShift, float& yOrientationShift) const;
+
+private:
+    EAlignmentBaseline dominantBaselineToAlignmentBaseline(bool isVerticalText, const RenderObject* textRenderer) const;
+
+    const Font& m_font;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(SVG)
+#endif