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diff --git a/third_party/libwebrtc/api/metronome/metronome.h b/third_party/libwebrtc/api/metronome/metronome.h
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+/*
+ *  Copyright (c) 2022 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 API_METRONOME_METRONOME_H_
+#define API_METRONOME_METRONOME_H_
+
+#include "api/task_queue/task_queue_base.h"
+#include "api/units/time_delta.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// The Metronome posts OnTick() calls requested with RequestCallOnNextTick.
+// The API is designed to be fully used from a single task queue. Scheduled
+// callbacks are executed on the same sequence as they were requested on. There
+// are no features implemented for cancellation. When that's needed, use e.g.
+// ScopedTaskSafety from the client.
+//
+// The metronome concept is still under experimentation, and may not be availble
+// in all platforms or applications. See https://crbug.com/1253787 for more
+// details.
+//
+// Metronome implementations must be thread-compatible.
+class RTC_EXPORT Metronome {
+ public:
+  virtual ~Metronome() = default;
+
+  // Requests a call to `callback` on the next tick. Scheduled callbacks are
+  // executed on the same sequence as they were requested on. There are no
+  // features for cancellation. When that's needed, use e.g. ScopedTaskSafety
+  // from the client.
+  virtual void RequestCallOnNextTick(absl::AnyInvocable<void() &&> callback) {}
+
+  // Returns the current tick period of the metronome.
+  virtual TimeDelta TickPeriod() const = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_METRONOME_METRONOME_H_