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diff --git a/third_party/libwebrtc/video/adaptation/bitrate_constraint.h b/third_party/libwebrtc/video/adaptation/bitrate_constraint.h
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+++ b/third_party/libwebrtc/video/adaptation/bitrate_constraint.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_BITRATE_CONSTRAINT_H_
+#define VIDEO_ADAPTATION_BITRATE_CONSTRAINT_H_
+
+#include <string>
+
+#include "absl/types/optional.h"
+#include "api/sequence_checker.h"
+#include "call/adaptation/adaptation_constraint.h"
+#include "call/adaptation/encoder_settings.h"
+#include "call/adaptation/video_source_restrictions.h"
+#include "call/adaptation/video_stream_input_state.h"
+#include "rtc_base/system/no_unique_address.h"
+
+namespace webrtc {
+
+class BitrateConstraint : public AdaptationConstraint {
+ public:
+  BitrateConstraint();
+  ~BitrateConstraint() override = default;
+
+  void OnEncoderSettingsUpdated(
+      absl::optional<EncoderSettings> encoder_settings);
+  void OnEncoderTargetBitrateUpdated(
+      absl::optional<uint32_t> encoder_target_bitrate_bps);
+
+  // AdaptationConstraint implementation.
+  std::string Name() const override { return "BitrateConstraint"; }
+  bool IsAdaptationUpAllowed(
+      const VideoStreamInputState& input_state,
+      const VideoSourceRestrictions& restrictions_before,
+      const VideoSourceRestrictions& restrictions_after) const override;
+
+ private:
+  RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;
+  absl::optional<EncoderSettings> encoder_settings_
+      RTC_GUARDED_BY(&sequence_checker_);
+  absl::optional<uint32_t> encoder_target_bitrate_bps_
+      RTC_GUARDED_BY(&sequence_checker_);
+};
+
+}  // namespace webrtc
+
+#endif  // VIDEO_ADAPTATION_BITRATE_CONSTRAINT_H_