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diff --git a/third_party/libwebrtc/net/dcsctp/packet/chunk_validators.h b/third_party/libwebrtc/net/dcsctp/packet/chunk_validators.h
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+++ b/third_party/libwebrtc/net/dcsctp/packet/chunk_validators.h
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+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef NET_DCSCTP_PACKET_CHUNK_VALIDATORS_H_
+#define NET_DCSCTP_PACKET_CHUNK_VALIDATORS_H_
+
+#include "net/dcsctp/packet/chunk/sack_chunk.h"
+
+namespace dcsctp {
+// Validates and cleans SCTP chunks.
+class ChunkValidators {
+ public:
+  // Given a SackChunk, will return `true` if it's valid, and `false` if not.
+  static bool Validate(const SackChunk& sack);
+
+  // Given a SackChunk, it will return a cleaned and validated variant of it.
+  // RFC4960 doesn't say anything about validity of SACKs or if the Gap ACK
+  // blocks must be sorted, and non-overlapping. While they always are in
+  // well-behaving implementations, this can't be relied on.
+  //
+  // This method internally calls `Validate`, which means that you can always
+  // pass a SackChunk to this method (valid or not), and use the results.
+  static SackChunk Clean(SackChunk&& sack);
+};
+}  // namespace dcsctp
+
+#endif  // NET_DCSCTP_PACKET_CHUNK_VALIDATORS_H_