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diff --git a/third_party/libwebrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h b/third_party/libwebrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h
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+++ b/third_party/libwebrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h
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+/*
+ *  Copyright (c) 2012 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.
+ */
+
+// This class estimates the incoming available bandwidth.
+
+#ifndef MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_
+#define MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_
+
+#include <cstdint>
+#include <vector>
+
+#include "api/units/data_rate.h"
+#include "api/units/time_delta.h"
+#include "modules/include/module_common_types.h"
+#include "modules/rtp_rtcp/source/rtp_packet_received.h"
+
+namespace webrtc {
+
+class Clock;
+
+// RemoteBitrateObserver is used to signal changes in bitrate estimates for
+// the incoming streams.
+class RemoteBitrateObserver {
+ public:
+  // Called when a receive channel group has a new bitrate estimate for the
+  // incoming streams.
+  virtual void OnReceiveBitrateChanged(const std::vector<uint32_t>& ssrcs,
+                                       uint32_t bitrate) = 0;
+
+  virtual ~RemoteBitrateObserver() {}
+};
+
+class RemoteBitrateEstimator : public CallStatsObserver {
+ public:
+  ~RemoteBitrateEstimator() override {}
+
+  // Called for each incoming packet. Updates the incoming payload bitrate
+  // estimate and the over-use detector. If an over-use is detected the
+  // remote bitrate estimate will be updated.
+  virtual void IncomingPacket(const RtpPacketReceived& rtp_packet) = 0;
+
+  // Removes all data for `ssrc`.
+  virtual void RemoveStream(uint32_t ssrc) = 0;
+
+  // Returns latest estimate or DataRate::Zero() if estimation is unavailable.
+  virtual DataRate LatestEstimate() const = 0;
+
+  virtual TimeDelta Process() = 0;
+
+ protected:
+  static constexpr TimeDelta kProcessInterval = TimeDelta::Millis(500);
+  static constexpr TimeDelta kStreamTimeOut = TimeDelta::Seconds(2);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_