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diff --git a/third_party/libwebrtc/rtc_base/experiments/alr_experiment.h b/third_party/libwebrtc/rtc_base/experiments/alr_experiment.h
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+++ b/third_party/libwebrtc/rtc_base/experiments/alr_experiment.h
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+/*
+ *  Copyright (c) 2018 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_ALR_EXPERIMENT_H_
+#define RTC_BASE_EXPERIMENTS_ALR_EXPERIMENT_H_
+
+#include <stdint.h>
+
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+#include "api/field_trials_view.h"
+
+namespace webrtc {
+struct AlrExperimentSettings {
+ public:
+  float pacing_factor;
+  int64_t max_paced_queue_time;
+  int alr_bandwidth_usage_percent;
+  int alr_start_budget_level_percent;
+  int alr_stop_budget_level_percent;
+  // Will be sent to the receive side for stats slicing.
+  // Can be 0..6, because it's sent as a 3 bits value and there's also
+  // reserved value to indicate absence of experiment.
+  int group_id;
+
+  static const char kScreenshareProbingBweExperimentName[];
+  static const char kStrictPacingAndProbingExperimentName[];
+  static absl::optional<AlrExperimentSettings> CreateFromFieldTrial(
+      absl::string_view experiment_name);
+  static absl::optional<AlrExperimentSettings> CreateFromFieldTrial(
+      const FieldTrialsView& key_value_config,
+      absl::string_view experiment_name);
+  static bool MaxOneFieldTrialEnabled();
+  static bool MaxOneFieldTrialEnabled(const FieldTrialsView& key_value_config);
+
+ private:
+  AlrExperimentSettings() = default;
+};
+}  // namespace webrtc
+
+#endif  // RTC_BASE_EXPERIMENTS_ALR_EXPERIMENT_H_