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diff --git a/third_party/libwebrtc/media/base/delayable.h b/third_party/libwebrtc/media/base/delayable.h
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+++ b/third_party/libwebrtc/media/base/delayable.h
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+/*
+ *  Copyright (c) 2019 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 MEDIA_BASE_DELAYABLE_H_
+#define MEDIA_BASE_DELAYABLE_H_
+
+#include <stdint.h>
+
+#include "absl/types/optional.h"
+
+namespace cricket {
+
+// Delayable is used by user code through ApplyConstraints algorithm. Its
+// methods must take precendence over similar functional in `syncable.h`.
+class Delayable {
+ public:
+  virtual ~Delayable() {}
+  // Set base minimum delay of the receive stream with specified ssrc.
+  // Base minimum delay sets lower bound on minimum delay value which
+  // determines minimum delay until audio playout.
+  // Returns false if there is no stream with given ssrc.
+  virtual bool SetBaseMinimumPlayoutDelayMs(uint32_t ssrc, int delay_ms) = 0;
+
+  // Returns current value of base minimum delay in milliseconds.
+  virtual absl::optional<int> GetBaseMinimumPlayoutDelayMs(
+      uint32_t ssrc) const = 0;
+};
+
+}  // namespace cricket
+
+#endif  // MEDIA_BASE_DELAYABLE_H_