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diff --git a/chromium/net/quic/core/crypto/chacha20_poly1305_encrypter.h b/chromium/net/quic/core/crypto/chacha20_poly1305_encrypter.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_QUIC_CRYPTO_CHACHA20_POLY1305_ENCRYPTER_H_
+#define NET_QUIC_CRYPTO_CHACHA20_POLY1305_ENCRYPTER_H_
+
+#include <stddef.h>
+
+#include "base/macros.h"
+#include "net/base/net_export.h"
+#include "net/quic/core/crypto/aead_base_encrypter.h"
+
+namespace net {
+
+// A ChaCha20Poly1305Encrypter is a QuicEncrypter that implements the
+// AEAD_CHACHA20_POLY1305 algorithm specified in
+// draft-agl-tls-chacha20poly1305-04, except that it truncates the Poly1305
+// authenticator to 12 bytes. Create an instance by calling
+// QuicEncrypter::Create(kCC12).
+//
+// It uses an authentication tag of 16 bytes (128 bits). There is no
+// fixed nonce prefix.
+class NET_EXPORT_PRIVATE ChaCha20Poly1305Encrypter : public AeadBaseEncrypter {
+ public:
+  enum {
+    kAuthTagSize = 12,
+  };
+
+  ChaCha20Poly1305Encrypter();
+  ~ChaCha20Poly1305Encrypter() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ChaCha20Poly1305Encrypter);
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CRYPTO_CHACHA20_POLY1305_ENCRYPTER_H_