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diff --git a/third_party/libwebrtc/modules/video_coding/utility/simulcast_rate_allocator.h b/third_party/libwebrtc/modules/video_coding/utility/simulcast_rate_allocator.h
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+++ b/third_party/libwebrtc/modules/video_coding/utility/simulcast_rate_allocator.h
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+/*
+ *  Copyright (c) 2016 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 MODULES_VIDEO_CODING_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_
+#define MODULES_VIDEO_CODING_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <vector>
+
+#include "api/video/video_bitrate_allocation.h"
+#include "api/video/video_bitrate_allocator.h"
+#include "api/video_codecs/video_codec.h"
+#include "rtc_base/experiments/rate_control_settings.h"
+#include "rtc_base/experiments/stable_target_rate_experiment.h"
+
+namespace webrtc {
+
+class SimulcastRateAllocator : public VideoBitrateAllocator {
+ public:
+  explicit SimulcastRateAllocator(const VideoCodec& codec);
+  ~SimulcastRateAllocator() override;
+
+  SimulcastRateAllocator(const SimulcastRateAllocator&) = delete;
+  SimulcastRateAllocator& operator=(const SimulcastRateAllocator&) = delete;
+
+  VideoBitrateAllocation Allocate(
+      VideoBitrateAllocationParameters parameters) override;
+  const VideoCodec& GetCodec() const;
+
+  static float GetTemporalRateAllocation(int num_layers,
+                                         int temporal_id,
+                                         bool base_heavy_tl3_alloc);
+
+  void SetLegacyConferenceMode(bool mode) override;
+
+ private:
+  void DistributeAllocationToSimulcastLayers(
+      DataRate total_bitrate,
+      DataRate stable_bitrate,
+      VideoBitrateAllocation* allocated_bitrates);
+  void DistributeAllocationToTemporalLayers(
+      VideoBitrateAllocation* allocated_bitrates) const;
+  std::vector<uint32_t> DefaultTemporalLayerAllocation(int bitrate_kbps,
+                                                       int max_bitrate_kbps,
+                                                       int simulcast_id) const;
+  std::vector<uint32_t> ScreenshareTemporalLayerAllocation(
+      int bitrate_kbps,
+      int max_bitrate_kbps,
+      int simulcast_id) const;
+  int NumTemporalStreams(size_t simulcast_id) const;
+
+  const VideoCodec codec_;
+  const StableTargetRateExperiment stable_rate_settings_;
+  const RateControlSettings rate_control_settings_;
+  std::vector<bool> stream_enabled_;
+  bool legacy_conference_mode_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_