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diff --git a/Source/WebCore/css/CSSToLengthConversionData.h b/Source/WebCore/css/CSSToLengthConversionData.h
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+/*
+ * Copyright (C) 2013 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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.
+ */
+
+#pragma once
+
+#include <wtf/Assertions.h>
+#include <wtf/Noncopyable.h>
+
+namespace WebCore {
+
+class RenderStyle;
+class RenderView;
+
+class CSSToLengthConversionData {
+public:
+    CSSToLengthConversionData(const RenderStyle* style, const RenderStyle* rootStyle, const RenderView* renderView, float zoom, bool computingFontSize = false)
+        : m_style(style)
+        , m_rootStyle(rootStyle)
+        , m_renderView(renderView)
+        , m_zoom(zoom)
+        , m_useEffectiveZoom(false)
+        , m_computingFontSize(computingFontSize)
+    {
+        ASSERT(zoom > 0);
+    }
+
+    CSSToLengthConversionData(const RenderStyle* style, const RenderStyle* rootStyle, const RenderView* renderView, bool computingFontSize = false)
+        : m_style(style)
+        , m_rootStyle(rootStyle)
+        , m_renderView(renderView)
+        , m_zoom(1)
+        , m_useEffectiveZoom(true)
+        , m_computingFontSize(computingFontSize)
+    {
+    }
+
+    CSSToLengthConversionData()
+        : CSSToLengthConversionData(nullptr, nullptr, nullptr)
+    {
+    }
+
+    const RenderStyle* style() const { return m_style; }
+    const RenderStyle* rootStyle() const { return m_rootStyle; }
+    float zoom() const;
+    bool computingFontSize() const { return m_computingFontSize; }
+
+    double viewportWidthFactor() const;
+    double viewportHeightFactor() const;
+    double viewportMinFactor() const;
+    double viewportMaxFactor() const;
+
+    CSSToLengthConversionData copyWithAdjustedZoom(float newZoom) const
+    {
+        return CSSToLengthConversionData(m_style, m_rootStyle, m_renderView, newZoom, m_computingFontSize);
+    }
+
+private:
+    const RenderStyle* m_style;
+    const RenderStyle* m_rootStyle;
+    const RenderView* m_renderView;
+    float m_zoom;
+    bool m_useEffectiveZoom;
+    bool m_computingFontSize;
+};
+
+} // namespace WebCore