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diff --git a/core/fxcrt/css/cfx_cssrulecollection.h b/core/fxcrt/css/cfx_cssrulecollection.h
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index 0000000000..6a509d49e7
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+++ b/core/fxcrt/css/cfx_cssrulecollection.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 CORE_FXCRT_CSS_CFX_CSSRULECOLLECTION_H_
+#define CORE_FXCRT_CSS_CFX_CSSRULECOLLECTION_H_
+
+#include <map>
+#include <memory>
+#include <vector>
+
+#include "core/fxcrt/fx_basic.h"
+
+class CFX_CSSDeclaration;
+class CFX_CSSSelector;
+class CFX_CSSStyleRule;
+class CFX_CSSStyleSheet;
+
+class CFX_CSSRuleCollection {
+ public:
+  class Data {
+   public:
+    Data(CFX_CSSSelector* pSel, CFX_CSSDeclaration* pDecl);
+
+    CFX_CSSSelector* const pSelector;
+    CFX_CSSDeclaration* const pDeclaration;
+  };
+
+  CFX_CSSRuleCollection();
+  ~CFX_CSSRuleCollection();
+
+  void AddRulesFrom(const CFX_CSSStyleSheet* sheet);
+  void Clear();
+  int32_t CountSelectors() const { return m_iSelectors; }
+
+  const std::vector<std::unique_ptr<Data>>* GetTagRuleData(
+      const CFX_WideString& tagname) const;
+
+ private:
+  void AddRulesFrom(const CFX_CSSStyleSheet* pStyleSheet,
+                    CFX_CSSStyleRule* pRule);
+
+  std::map<uint32_t, std::vector<std::unique_ptr<Data>>> m_TagRules;
+  int32_t m_iSelectors;
+};
+
+#endif  // CORE_FXCRT_CSS_CFX_CSSRULECOLLECTION_H_