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diff --git a/third_party/libwebrtc/rtc_base/experiments/stable_target_rate_experiment.h b/third_party/libwebrtc/rtc_base/experiments/stable_target_rate_experiment.h
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+++ b/third_party/libwebrtc/rtc_base/experiments/stable_target_rate_experiment.h
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+/*
+ *  Copyright 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 RTC_BASE_EXPERIMENTS_STABLE_TARGET_RATE_EXPERIMENT_H_
+#define RTC_BASE_EXPERIMENTS_STABLE_TARGET_RATE_EXPERIMENT_H_
+
+#include "api/field_trials_view.h"
+#include "rtc_base/experiments/field_trial_parser.h"
+
+namespace webrtc {
+
+class StableTargetRateExperiment {
+ public:
+  StableTargetRateExperiment(const StableTargetRateExperiment&);
+  StableTargetRateExperiment(StableTargetRateExperiment&&);
+  static StableTargetRateExperiment ParseFromFieldTrials();
+  static StableTargetRateExperiment ParseFromKeyValueConfig(
+      const FieldTrialsView* const key_value_config);
+
+  bool IsEnabled() const;
+  double GetVideoHysteresisFactor() const;
+  double GetScreenshareHysteresisFactor() const;
+
+ private:
+  explicit StableTargetRateExperiment(
+      const FieldTrialsView* const key_value_config,
+      double default_video_hysteresis,
+      double default_screenshare_hysteresis);
+
+  FieldTrialParameter<bool> enabled_;
+  FieldTrialParameter<double> video_hysteresis_factor_;
+  FieldTrialParameter<double> screenshare_hysteresis_factor_;
+};
+
+}  // namespace webrtc
+
+#endif  // RTC_BASE_EXPERIMENTS_STABLE_TARGET_RATE_EXPERIMENT_H_