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diff --git a/chromium/net/third_party/quiche/src/quic/core/qpack/qpack_decoder_stream_sender.h b/chromium/net/third_party/quiche/src/quic/core/qpack/qpack_decoder_stream_sender.h
new file mode 100644
index 00000000000..a791173f801
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+++ b/chromium/net/third_party/quiche/src/quic/core/qpack/qpack_decoder_stream_sender.h
@@ -0,0 +1,55 @@
+// Copyright (c) 2018 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 QUICHE_QUIC_CORE_QPACK_QPACK_DECODER_STREAM_SENDER_H_
+#define QUICHE_QUIC_CORE_QPACK_QPACK_DECODER_STREAM_SENDER_H_
+
+#include <cstdint>
+
+#include "net/third_party/quiche/src/quic/core/qpack/qpack_instruction_encoder.h"
+#include "net/third_party/quiche/src/quic/core/quic_types.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_string_piece.h"
+
+namespace quic {
+
+// This class serializes (encodes) instructions for transmission on the decoder
+// stream.
+class QUIC_EXPORT_PRIVATE QpackDecoderStreamSender {
+ public:
+  // An interface for handling encoded data.
+  class Delegate {
+   public:
+    virtual ~Delegate() = default;
+
+    // Encoded |data| is ready to be written on the decoder stream.
+    // WriteDecoderStreamData() is called exactly once for each instruction.
+    // |data| contains the entire encoded instruction and it is guaranteed to be
+    // not empty.
+    virtual void WriteDecoderStreamData(QuicStringPiece data) = 0;
+  };
+
+  explicit QpackDecoderStreamSender(Delegate* delegate);
+  QpackDecoderStreamSender() = delete;
+  QpackDecoderStreamSender(const QpackDecoderStreamSender&) = delete;
+  QpackDecoderStreamSender& operator=(const QpackDecoderStreamSender&) = delete;
+
+  // Methods for sending instructions, see
+  // https://quicwg.org/base-drafts/draft-ietf-quic-qpack.html#rfc.section.5.3
+
+  // 5.3.1 Insert Count Increment
+  void SendInsertCountIncrement(uint64_t increment);
+  // 5.3.2 Header Acknowledgement
+  void SendHeaderAcknowledgement(QuicStreamId stream_id);
+  // 5.3.3 Stream Cancellation
+  void SendStreamCancellation(QuicStreamId stream_id);
+
+ private:
+  Delegate* const delegate_;
+  QpackInstructionEncoder instruction_encoder_;
+};
+
+}  // namespace quic
+
+#endif  // QUICHE_QUIC_CORE_QPACK_QPACK_DECODER_STREAM_SENDER_H_