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diff --git a/Source/WebCore/css/parser/CSSDeferredParser.h b/Source/WebCore/css/parser/CSSDeferredParser.h
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+++ b/Source/WebCore/css/parser/CSSDeferredParser.h
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+/*
+ * Copyright (C) 2016 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "CSSParserMode.h"
+#include "CSSTokenizer.h"
+#include <wtf/RefCounted.h>
+#include <wtf/WeakPtr.h>
+
+namespace WebCore {
+
+class ImmutableStyleProperties;
+class StyleRuleKeyframes;
+class StyleRuleBase;
+
+class CSSDeferredParser : public RefCounted<CSSDeferredParser> {
+public:
+    static Ref<CSSDeferredParser> create(const CSSParserContext& parserContext, const String& sheetText, StyleSheetContents& styleSheet)
+    {
+        return adoptRef(*new CSSDeferredParser(parserContext, sheetText, styleSheet));
+    }
+
+    CSSParserMode mode() const { return m_context.mode; }
+
+    const CSSParserContext& context() const { return m_context; }
+    StyleSheetContents* styleSheet() const { return m_styleSheet.get(); }
+
+    Ref<ImmutableStyleProperties> parseDeclaration(const CSSParserTokenRange&);
+    void parseRuleList(const CSSParserTokenRange&, Vector<RefPtr<StyleRuleBase>>&);
+    void parseKeyframeList(const CSSParserTokenRange&, StyleRuleKeyframes&);
+
+    void adoptTokenizerEscapedStrings(Vector<String>&& strings) { m_escapedStrings = WTFMove(strings); }
+
+private:
+    CSSDeferredParser(const CSSParserContext&, const String&, StyleSheetContents&);
+    
+    Vector<String> m_escapedStrings;
+    CSSParserContext m_context;
+    
+    String m_sheetText;
+
+    WeakPtr<StyleSheetContents> m_styleSheet;
+};
+
+} // namespace WebCore