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diff --git a/net/spdy/hpack_decoder.h b/net/spdy/hpack_decoder.h
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+++ b/net/spdy/hpack_decoder.h
@@ -0,0 +1,64 @@
+// 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_DECODER_H_
+#define NET_SPDY_HPACK_DECODER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/macros.h"
+#include "base/strings/string_piece.h"
+#include "net/base/net_export.h"
+#include "net/spdy/hpack_encoding_context.h"
+#include "net/spdy/hpack_input_stream.h"  // For HpackHeaderPairVector.
+
+namespace net {
+
+// An HpackDecoder decodes header sets as outlined in
+// http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-05
+// .
+class NET_EXPORT_PRIVATE HpackDecoder {
+ public:
+  explicit HpackDecoder(uint32 max_string_literal_size);
+  ~HpackDecoder();
+
+  // Decodes the given string into the given header set. Returns
+  // whether or not the decoding was successful.
+  //
+  // TODO(akalin): Emit the headers via a callback/delegate instead of
+  // putting them into a vector.
+  bool DecodeHeaderSet(base::StringPiece input,
+                       HpackHeaderPairVector* header_list);
+
+  // Accessors for testing.
+
+  bool DecodeNextNameForTest(HpackInputStream* input_stream,
+                             base::StringPiece* next_name) {
+    return DecodeNextName(input_stream, next_name);
+  }
+
+ private:
+  const uint32 max_string_literal_size_;
+  HpackEncodingContext context_;
+
+  // Tries to process the next header representation and maybe emit
+  // headers into |header_list| according to it. Returns true if
+  // successful, or false if an error was encountered.
+  bool ProcessNextHeaderRepresentation(
+      HpackInputStream* input_stream,
+      HpackHeaderPairVector* header_list);
+
+  bool DecodeNextName(HpackInputStream* input_stream,
+                      base::StringPiece* next_name);
+  bool DecodeNextValue(HpackInputStream* input_stream,
+                       base::StringPiece* next_name);
+
+  DISALLOW_COPY_AND_ASSIGN(HpackDecoder);
+};
+
+}  // namespace net
+
+#endif  // NET_SPDY_HPACK_DECODER_H_