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diff --git a/third_party/libwebrtc/modules/remote_bitrate_estimator/overuse_estimator.h b/third_party/libwebrtc/modules/remote_bitrate_estimator/overuse_estimator.h
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+++ b/third_party/libwebrtc/modules/remote_bitrate_estimator/overuse_estimator.h
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+/*
+ *  Copyright (c) 2013 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 MODULES_REMOTE_BITRATE_ESTIMATOR_OVERUSE_ESTIMATOR_H_
+#define MODULES_REMOTE_BITRATE_ESTIMATOR_OVERUSE_ESTIMATOR_H_
+
+#include <stdint.h>
+
+#include <deque>
+
+#include "api/network_state_predictor.h"
+
+namespace webrtc {
+
+class OveruseEstimator {
+ public:
+  OveruseEstimator();
+
+  OveruseEstimator(const OveruseEstimator&) = delete;
+  OveruseEstimator& operator=(const OveruseEstimator&) = delete;
+
+  ~OveruseEstimator() = default;
+
+  // Update the estimator with a new sample. The deltas should represent deltas
+  // between timestamp groups as defined by the InterArrival class.
+  // `current_hypothesis` should be the hypothesis of the over-use detector at
+  // this time.
+  void Update(int64_t t_delta,
+              double ts_delta,
+              int size_delta,
+              BandwidthUsage current_hypothesis,
+              int64_t now_ms);
+
+  // Returns the estimated noise/jitter variance in ms^2.
+  double var_noise() const { return var_noise_; }
+
+  // Returns the estimated inter-arrival time delta offset in ms.
+  double offset() const { return offset_; }
+
+  // Returns the number of deltas which the current over-use estimator state is
+  // based on.
+  int num_of_deltas() const { return num_of_deltas_; }
+
+ private:
+  double UpdateMinFramePeriod(double ts_delta);
+  void UpdateNoiseEstimate(double residual, double ts_delta, bool stable_state);
+
+  int num_of_deltas_ = 0;
+  double slope_ = 8.0 / 512.0;
+  double offset_ = 0;
+  double prev_offset_ = 0;
+  double E_[2][2] = {{100.0, 0.0}, {0.0, 1e-1}};
+  double process_noise_[2] = {1e-13, 1e-3};
+  double avg_noise_ = 0.0;
+  double var_noise_ = 50.0;
+  std::deque<double> ts_delta_hist_;
+};
+}  // namespace webrtc
+
+#endif  // MODULES_REMOTE_BITRATE_ESTIMATOR_OVERUSE_ESTIMATOR_H_