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diff --git a/chromium/net/third_party/quiche/src/quiche/quic/core/crypto/chacha20_poly1305_tls_encrypter.h b/chromium/net/third_party/quiche/src/quiche/quic/core/crypto/chacha20_poly1305_tls_encrypter.h
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+++ b/chromium/net/third_party/quiche/src/quiche/quic/core/crypto/chacha20_poly1305_tls_encrypter.h
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+// Copyright 2017 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_CRYPTO_CHACHA20_POLY1305_TLS_ENCRYPTER_H_
+#define QUICHE_QUIC_CORE_CRYPTO_CHACHA20_POLY1305_TLS_ENCRYPTER_H_
+
+#include "quiche/quic/core/crypto/chacha_base_encrypter.h"
+#include "quiche/quic/platform/api/quic_export.h"
+
+namespace quic {
+
+// A ChaCha20Poly1305Encrypter is a QuicEncrypter that implements the
+// AEAD_CHACHA20_POLY1305 algorithm specified in RFC 7539 for use in IETF QUIC.
+//
+// It uses an authentication tag of 16 bytes (128 bits). It uses a 12 byte IV
+// that is XOR'd with the packet number to compute the nonce.
+class QUIC_EXPORT_PRIVATE ChaCha20Poly1305TlsEncrypter
+    : public ChaChaBaseEncrypter {
+ public:
+  enum {
+    kAuthTagSize = 16,
+  };
+
+  ChaCha20Poly1305TlsEncrypter();
+  ChaCha20Poly1305TlsEncrypter(const ChaCha20Poly1305TlsEncrypter&) = delete;
+  ChaCha20Poly1305TlsEncrypter& operator=(const ChaCha20Poly1305TlsEncrypter&) =
+      delete;
+  ~ChaCha20Poly1305TlsEncrypter() override;
+
+  QuicPacketCount GetConfidentialityLimit() const override;
+};
+
+}  // namespace quic
+
+#endif  // QUICHE_QUIC_CORE_CRYPTO_CHACHA20_POLY1305_TLS_ENCRYPTER_H_