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diff --git a/third_party/libwebrtc/video/adaptation/quality_rampup_experiment_helper.h b/third_party/libwebrtc/video/adaptation/quality_rampup_experiment_helper.h
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+/*
+ *  Copyright 2020 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 VIDEO_ADAPTATION_QUALITY_RAMPUP_EXPERIMENT_HELPER_H_
+#define VIDEO_ADAPTATION_QUALITY_RAMPUP_EXPERIMENT_HELPER_H_
+
+#include <memory>
+
+#include "api/scoped_refptr.h"
+#include "api/units/data_rate.h"
+#include "rtc_base/experiments/quality_rampup_experiment.h"
+#include "system_wrappers/include/clock.h"
+#include "video/adaptation/quality_scaler_resource.h"
+
+namespace webrtc {
+
+class QualityRampUpExperimentListener {
+ public:
+  virtual ~QualityRampUpExperimentListener() = default;
+  virtual void OnQualityRampUp() = 0;
+};
+
+// Helper class for orchestrating the WebRTC-Video-QualityRampupSettings
+// experiment.
+class QualityRampUpExperimentHelper {
+ public:
+  // Returns a QualityRampUpExperimentHelper if the experiment is enabled,
+  // an nullptr otherwise.
+  static std::unique_ptr<QualityRampUpExperimentHelper> CreateIfEnabled(
+      QualityRampUpExperimentListener* experiment_listener,
+      Clock* clock);
+
+  QualityRampUpExperimentHelper(const QualityRampUpExperimentHelper&) = delete;
+  QualityRampUpExperimentHelper& operator=(
+      const QualityRampUpExperimentHelper&) = delete;
+
+  void cpu_adapted(bool cpu_adapted);
+  void qp_resolution_adaptations(int qp_adaptations);
+
+  void ConfigureQualityRampupExperiment(bool reset,
+                                        absl::optional<uint32_t> pixels,
+                                        absl::optional<DataRate> max_bitrate);
+
+  void PerformQualityRampupExperiment(
+      rtc::scoped_refptr<QualityScalerResource> quality_scaler_resource,
+      DataRate bandwidth,
+      DataRate encoder_target_bitrate,
+      absl::optional<DataRate> max_bitrate);
+
+ private:
+  QualityRampUpExperimentHelper(
+      QualityRampUpExperimentListener* experiment_listener,
+      Clock* clock,
+      QualityRampupExperiment experiment);
+  QualityRampUpExperimentListener* const experiment_listener_;
+  Clock* clock_;
+  QualityRampupExperiment quality_rampup_experiment_;
+  bool cpu_adapted_;
+  int qp_resolution_adaptations_;
+};
+
+}  // namespace webrtc
+
+#endif  // VIDEO_ADAPTATION_QUALITY_RAMPUP_EXPERIMENT_HELPER_H_