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diff --git a/chromium/net/spdy/hpack_constants.h b/chromium/net/spdy/hpack_constants.h
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+// Copyright 2014 The Chromium 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 NET_SPDY_HPACK_CONSTANTS_H_
+#define NET_SPDY_HPACK_CONSTANTS_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "net/base/net_export.h"
+
+// All section references below are to
+// http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-07
+
+namespace net {
+
+// An HpackPrefix signifies |bits| stored in the top |bit_size| bits
+// of an octet.
+struct HpackPrefix {
+  uint8 bits;
+  size_t bit_size;
+};
+
+// Represents a symbol and its Huffman code (stored in most-significant bits).
+struct HpackHuffmanSymbol {
+  uint32 code;
+  uint8 length;
+  uint16 id;
+};
+
+class HpackHuffmanTable;
+
+const uint32 kDefaultHeaderTableSizeSetting = 4096;
+
+// Largest string literal an HpackDecoder/HpackEncoder will attempt to process
+// before returning an error.
+const uint32 kDefaultMaxStringLiteralSize = 16 * 1024;
+
+// Maximum amount of encoded header buffer HpackDecoder will retain before
+// returning an error.
+// TODO(jgraettinger): Remove with SpdyHeadersHandlerInterface switch.
+const uint32 kMaxDecodeBufferSize = 32 * 1024;
+
+// 4.1.2: Flag for a string literal that is stored unmodified (i.e.,
+// without Huffman encoding).
+const HpackPrefix kStringLiteralIdentityEncoded = { 0x0, 1 };
+
+// 4.1.2: Flag for a Huffman-coded string literal.
+const HpackPrefix kStringLiteralHuffmanEncoded = { 0x1, 1 };
+
+// 4.2: Opcode for an indexed header field.
+const HpackPrefix kIndexedOpcode = { 0x1, 1 };
+
+// 4.3.1: Opcode for a literal header field with incremental indexing.
+const HpackPrefix kLiteralIncrementalIndexOpcode = { 0x1, 2 };
+
+// 4.3.2: Opcode for a literal header field without indexing.
+const HpackPrefix kLiteralNoIndexOpcode = { 0x0, 4 };
+
+// 4.3.3: Opcode for a literal header field which is never indexed.
+const HpackPrefix kLiteralNeverIndexOpcode = { 0x1, 4 };
+
+// 4.4: Opcode for an encoding context update.
+const HpackPrefix kEncodingContextOpcode = { 0x1, 3 };
+
+// 4.4: Flag following an |kEncodingContextOpcode|, which indicates
+// the reference set should be cleared.
+const HpackPrefix kEncodingContextEmptyReferenceSet = { 0x10, 5 };
+
+// 4.4: Flag following an |kEncodingContextOpcode|, which indicates
+// the encoder is using a new maximum headers table size. Begins a
+// varint-encoded table size with a 4-bit prefix.
+const HpackPrefix kEncodingContextNewMaximumSize = { 0x0, 1 };
+
+// Returns symbol code table from "Appendix C. Huffman Codes".
+NET_EXPORT_PRIVATE std::vector<HpackHuffmanSymbol> HpackHuffmanCode();
+
+// Returns a HpackHuffmanTable instance initialized with |kHpackHuffmanCode|.
+// The instance is read-only, has static lifetime, and is safe to share amoung
+// threads. This function is thread-safe.
+NET_EXPORT_PRIVATE const HpackHuffmanTable& ObtainHpackHuffmanTable();
+
+}  // namespace net
+
+#endif  // NET_SPDY_HPACK_CONSTANTS_H_