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diff --git a/Source/WebCore/css/parser/CSSParserObserver.h b/Source/WebCore/css/parser/CSSParserObserver.h
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+++ b/Source/WebCore/css/parser/CSSParserObserver.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 "CSSPropertySourceData.h"
+#include "StyleRule.h"
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+class CSSParserToken;
+class CSSParserTokenRange;
+
+// This is only for the inspector and shouldn't be used elsewhere.
+class CSSParserObserver {
+public:
+    virtual ~CSSParserObserver() { };
+    virtual void startRuleHeader(StyleRule::Type, unsigned offset) = 0;
+    virtual void endRuleHeader(unsigned offset) = 0;
+    virtual void observeSelector(unsigned startOffset, unsigned endOffset) = 0;
+    virtual void startRuleBody(unsigned offset) = 0;
+    virtual void endRuleBody(unsigned offset) = 0;
+    virtual void observeProperty(unsigned startOffset, unsigned endOffset, bool isImportant, bool isParsed) = 0;
+    virtual void observeComment(unsigned startOffset, unsigned endOffset) = 0;
+};
+
+} // namespace WebCore