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diff --git a/core/fxcodec/JBig2_DocumentContext.h b/core/fxcodec/JBig2_DocumentContext.h
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+++ b/core/fxcodec/JBig2_DocumentContext.h
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+// Copyright 2016 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_FXCODEC_JBIG2_DOCUMENTCONTEXT_H_
+#define CORE_FXCODEC_JBIG2_DOCUMENTCONTEXT_H_
+
+#include <list>
+#include <memory>
+#include <utility>
+
+class CJBig2_SymbolDict;
+
+using CJBig2_CacheKey = std::pair<uint32_t, uint32_t>;
+using CJBig2_CachePair =
+    std::pair<CJBig2_CacheKey, std::unique_ptr<CJBig2_SymbolDict>>;
+
+// Holds per-document JBig2 related data.
+class JBig2_DocumentContext {
+ public:
+  JBig2_DocumentContext();
+  ~JBig2_DocumentContext();
+
+  std::list<CJBig2_CachePair>* GetSymbolDictCache() {
+    return &m_SymbolDictCache;
+  }
+
+ private:
+  std::list<CJBig2_CachePair> m_SymbolDictCache;
+};
+
+#endif  // CORE_FXCODEC_JBIG2_DOCUMENTCONTEXT_H_