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diff --git a/xfa/fde/css/cfde_cssrule.h b/xfa/fde/css/cfde_cssrule.h
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+++ b/xfa/fde/css/cfde_cssrule.h
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+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef XFA_FDE_CSS_CFDE_CSSRULE_H_
+#define XFA_FDE_CSS_CFDE_CSSRULE_H_
+
+#include "xfa/fde/css/fde_css.h"
+
+class CFDE_CSSRule {
+ public:
+  virtual ~CFDE_CSSRule();
+
+  FDE_CSSRuleType GetType() const { return m_type; }
+
+ protected:
+  explicit CFDE_CSSRule(FDE_CSSRuleType type);
+
+ private:
+  FDE_CSSRuleType m_type;
+};
+
+#endif  // XFA_FDE_CSS_CFDE_CSSRULE_H_