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diff --git a/constants/stream_dict_common.h b/constants/stream_dict_common.h
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+// Copyright 2018 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.
+
+#ifndef CONSTANTS_STREAM_DICT_COMMON_H_
+#define CONSTANTS_STREAM_DICT_COMMON_H_
+
+namespace pdfium {
+namespace stream {
+
+// PDF 1.7 spec, table 3.4.
+// Entries common to all stream dictionaries.
+
+// TODO(https://crbug.com/pdfium/1049): Examine all usages of "Length",
+// "Filter", and "F".
+constexpr char kLength[] = "Length";
+constexpr char kFilter[] = "Filter";
+constexpr char kDecodeParms[] = "DecodeParms";
+constexpr char kF[] = "F";
+// constexpr char kFFilter[] = "FFilter";
+// constexpr char kFDecodeParms[] = "FDecodeParms";
+constexpr char kDL[] = "DL";
+
+}  // namespace stream
+}  // namespace pdfium
+
+#endif  // CONSTANTS_STREAM_DICT_COMMON_H_