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diff --git a/Source/WebCore/css/parser/CSSPropertyParser.h b/Source/WebCore/css/parser/CSSPropertyParser.h
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+/*
+ * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010, 2016 Apple Inc. All rights reserved.
+ * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
+ * Copyright (C) 2009 - 2010  Torch Mobile (Beijing) Co. Ltd. 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
+
+#include "CSSParserTokenRange.h"
+#include "StyleRule.h"
+#include <wtf/text/StringView.h>
+
+namespace WebCore {
+
+class CSSProperty;
+class CSSValue;
+class StylePropertyShorthand;
+class StyleSheetContents;
+    
+// Inputs: PropertyID, isImportant bool, CSSParserTokenRange.
+// Outputs: Vector of CSSProperties
+
+class CSSPropertyParser {
+    WTF_MAKE_NONCOPYABLE(CSSPropertyParser);
+public:
+    static bool parseValue(CSSPropertyID, bool important,
+        const CSSParserTokenRange&, const CSSParserContext&, StyleSheetContents*,
+        Vector<CSSProperty, 256>&, StyleRule::Type);
+
+    // Parses a non-shorthand CSS property
+    static RefPtr<CSSValue> parseSingleValue(CSSPropertyID, const CSSParserTokenRange&, const CSSParserContext&, StyleSheetContents*);
+
+private:
+    CSSPropertyParser(const CSSParserTokenRange&, const CSSParserContext&, StyleSheetContents*, Vector<CSSProperty, 256>*);
+
+    // FIXME: Rename once the CSSParserValue-based parseValue is removed
+    bool parseValueStart(CSSPropertyID, bool important);
+    bool consumeCSSWideKeyword(CSSPropertyID, bool important);
+    RefPtr<CSSValue> parseSingleValue(CSSPropertyID, CSSPropertyID = CSSPropertyInvalid);
+
+    bool inQuirksMode() const { return m_context.mode == HTMLQuirksMode; }
+
+    bool parseViewportDescriptor(CSSPropertyID propId, bool important);
+    bool parseFontFaceDescriptor(CSSPropertyID);
+
+    void addProperty(CSSPropertyID, CSSPropertyID, Ref<CSSValue>&&, bool important, bool implicit = false);
+    void addExpandedPropertyForValue(CSSPropertyID propId, Ref<CSSValue>&&, bool);
+
+    bool consumeBorder(bool important);
+
+    bool parseShorthand(CSSPropertyID, bool important);
+    bool consumeShorthandGreedily(const StylePropertyShorthand&, bool important);
+    bool consume4Values(const StylePropertyShorthand&, bool important);
+
+    // Legacy parsing allows <string>s for animation-name
+    bool consumeAnimationShorthand(const StylePropertyShorthand&, bool important);
+    bool consumeBackgroundShorthand(const StylePropertyShorthand&, bool important);
+
+    bool consumeColumns(bool important);
+
+    bool consumeGridItemPositionShorthand(CSSPropertyID, bool important);
+    bool consumeGridTemplateRowsAndAreasAndColumns(CSSPropertyID, bool important);
+    bool consumeGridTemplateShorthand(CSSPropertyID, bool important);
+    bool consumeGridShorthand(bool important);
+    bool consumeGridAreaShorthand(bool important);
+
+    bool consumeFont(bool important);
+    bool consumeFontVariantShorthand(bool important);
+    bool consumeSystemFont(bool important);
+
+    bool consumeBorderSpacing(bool important);
+
+    // CSS3 Parsing Routines (for properties specific to CSS3)
+    bool consumeBorderImage(CSSPropertyID, bool important);
+
+    bool consumeFlex(bool important);
+
+    bool consumeLegacyBreakProperty(CSSPropertyID, bool important);
+
+    bool consumeTransformOrigin(bool important);
+    bool consumePerspectiveOrigin(bool important);
+
+private:
+    // Inputs:
+    CSSParserTokenRange m_range;
+    const CSSParserContext& m_context;
+    StyleSheetContents* m_styleSheetContents;
+
+    // Outputs:
+    Vector<CSSProperty, 256>* m_parsedProperties;
+};
+
+CSSPropertyID cssPropertyID(StringView);
+CSSValueID cssValueKeywordID(StringView);
+bool isCustomPropertyName(const String&);
+
+#if PLATFORM(IOS)
+void cssPropertyNameIOSAliasing(const char* propertyName, const char*& propertyNameAlias, unsigned& newLength);
+#endif
+
+} // namespace WebCore