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diff --git a/third_party/libwebrtc/rtc_base/experiments/quality_scaling_experiment.h b/third_party/libwebrtc/rtc_base/experiments/quality_scaling_experiment.h
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+++ b/third_party/libwebrtc/rtc_base/experiments/quality_scaling_experiment.h
@@ -0,0 +1,61 @@
+/*
+ *  Copyright 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_QUALITY_SCALING_EXPERIMENT_H_
+#define RTC_BASE_EXPERIMENTS_QUALITY_SCALING_EXPERIMENT_H_
+
+#include "absl/types/optional.h"
+#include "api/field_trials_view.h"
+#include "api/video_codecs/video_encoder.h"
+
+namespace webrtc {
+class QualityScalingExperiment {
+ public:
+  struct Settings {
+    int vp8_low;       // VP8: low QP threshold.
+    int vp8_high;      // VP8: high QP threshold.
+    int vp9_low;       // VP9: low QP threshold.
+    int vp9_high;      // VP9: high QP threshold.
+    int h264_low;      // H264: low QP threshold.
+    int h264_high;     // H264: high QP threshold.
+    int generic_low;   // Generic: low QP threshold.
+    int generic_high;  // Generic: high QP threshold.
+    float alpha_high;  // `alpha_` for ExpFilter used when checking high QP.
+    float alpha_low;   // `alpha_` for ExpFilter used when checking low QP.
+    int drop;          // >0 sets `use_all_drop_reasons` to true.
+  };
+
+  // Used by QualityScaler.
+  struct Config {
+    float alpha_high = 0.9995f;
+    float alpha_low = 0.9999f;
+    // If set, all type of dropped frames are used.
+    // Otherwise only dropped frames by MediaOptimization are used.
+    bool use_all_drop_reasons = false;
+  };
+
+  // Returns true if the experiment is enabled.
+  static bool Enabled(const FieldTrialsView& field_trials);
+
+  // Returns settings from field trial.
+  static absl::optional<Settings> ParseSettings(
+      const FieldTrialsView& field_trials);
+
+  // Returns QpThresholds for the `codec_type`.
+  static absl::optional<VideoEncoder::QpThresholds> GetQpThresholds(
+      VideoCodecType codec_type,
+      const FieldTrialsView& field_trials);
+
+  // Returns parsed values. If the parsing fails, default values are returned.
+  static Config GetConfig(const FieldTrialsView& field_trials);
+};
+
+}  // namespace webrtc
+
+#endif  // RTC_BASE_EXPERIMENTS_QUALITY_SCALING_EXPERIMENT_H_