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diff --git a/third_party/libwebrtc/api/transport/bitrate_settings.h b/third_party/libwebrtc/api/transport/bitrate_settings.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 API_TRANSPORT_BITRATE_SETTINGS_H_
+#define API_TRANSPORT_BITRATE_SETTINGS_H_
+
+#include <algorithm>
+
+#include "absl/types/optional.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// Configuration of send bitrate. The `start_bitrate_bps` value is
+// used for multiple purposes, both as a prior in the bandwidth
+// estimator, and for initial configuration of the encoder. We may
+// want to create separate apis for those, and use a smaller struct
+// with only the min and max constraints.
+struct RTC_EXPORT BitrateSettings {
+  BitrateSettings();
+  ~BitrateSettings();
+  BitrateSettings(const BitrateSettings&);
+  // 0 <= min <= start <= max should hold for set parameters.
+  absl::optional<int> min_bitrate_bps;
+  absl::optional<int> start_bitrate_bps;
+  absl::optional<int> max_bitrate_bps;
+};
+
+// TODO(srte): BitrateConstraints and BitrateSettings should be merged.
+// Both represent the same kind data, but are using different default
+// initializer and representation of unset values.
+struct BitrateConstraints {
+  int min_bitrate_bps = 0;
+  int start_bitrate_bps = kDefaultStartBitrateBps;
+  int max_bitrate_bps = -1;
+
+ private:
+  static constexpr int kDefaultStartBitrateBps = 300000;
+};
+
+}  // namespace webrtc
+
+#endif  // API_TRANSPORT_BITRATE_SETTINGS_H_