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diff --git a/third_party/libwebrtc/net/dcsctp/public/timeout.h b/third_party/libwebrtc/net/dcsctp/public/timeout.h
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+++ b/third_party/libwebrtc/net/dcsctp/public/timeout.h
@@ -0,0 +1,53 @@
+/*
+ *  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_PUBLIC_TIMEOUT_H_
+#define NET_DCSCTP_PUBLIC_TIMEOUT_H_
+
+#include <cstdint>
+
+#include "net/dcsctp/public/types.h"
+
+namespace dcsctp {
+
+// A very simple timeout that can be started and stopped. When started,
+// it will be given a unique `timeout_id` which should be provided to
+// `DcSctpSocket::HandleTimeout` when it expires.
+class Timeout {
+ public:
+  virtual ~Timeout() = default;
+
+  // Called to start time timeout, with the duration in milliseconds as
+  // `duration` and with the timeout identifier as `timeout_id`, which - if
+  // the timeout expires - shall be provided to `DcSctpSocket::HandleTimeout`.
+  //
+  // `Start` and `Stop` will always be called in pairs. In other words will
+  // ´Start` never be called twice, without a call to `Stop` in between.
+  virtual void Start(DurationMs duration, TimeoutID timeout_id) = 0;
+
+  // Called to stop the running timeout.
+  //
+  // `Start` and `Stop` will always be called in pairs. In other words will
+  // ´Start` never be called twice, without a call to `Stop` in between.
+  //
+  // `Stop` will always be called prior to releasing this object.
+  virtual void Stop() = 0;
+
+  // Called to restart an already running timeout, with the `duration` and
+  // `timeout_id` parameters as described in `Start`. This can be overridden by
+  // the implementation to restart it more efficiently.
+  virtual void Restart(DurationMs duration, TimeoutID timeout_id) {
+    Stop();
+    Start(duration, timeout_id);
+  }
+};
+
+}  // namespace dcsctp
+
+#endif  // NET_DCSCTP_PUBLIC_TIMEOUT_H_