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diff --git a/Source/WebCore/rendering/style/TextSizeAdjustment.h b/Source/WebCore/rendering/style/TextSizeAdjustment.h
new file mode 100644
index 000000000..f37c30146
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+++ b/Source/WebCore/rendering/style/TextSizeAdjustment.h
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+/*
+ * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 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.
+ *
+ */
+
+#pragma once
+
+#if ENABLE(TEXT_AUTOSIZING)
+
+namespace WebCore {
+
+enum TextSizeAdjustmentType { AutoTextSizeAdjustment = -1, NoTextSizeAdjustment = -2 };
+
+class TextSizeAdjustment {
+public:
+    TextSizeAdjustment() : m_value(AutoTextSizeAdjustment) { }
+    TextSizeAdjustment(float value) : m_value(value) { }
+
+    float percentage() const { return m_value; }
+    float multiplier() const { return m_value / 100; }
+
+    bool isAuto() const { return m_value == AutoTextSizeAdjustment; }
+    bool isNone() const { return m_value == NoTextSizeAdjustment; }
+    bool isPercentage() const { return m_value >= 0; }
+
+    bool operator==(const TextSizeAdjustment& anAdjustment) const { return m_value == anAdjustment.m_value; }
+    bool operator!=(const TextSizeAdjustment& anAdjustment) const { return m_value != anAdjustment.m_value; }
+
+private:
+    float m_value;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(TEXT_AUTOSIZING)