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diff --git a/third_party/libwebrtc/modules/video_coding/svc/svc_rate_allocator.h b/third_party/libwebrtc/modules/video_coding/svc/svc_rate_allocator.h
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+++ b/third_party/libwebrtc/modules/video_coding/svc/svc_rate_allocator.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 MODULES_VIDEO_CODING_SVC_SVC_RATE_ALLOCATOR_H_
+#define MODULES_VIDEO_CODING_SVC_SVC_RATE_ALLOCATOR_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "absl/container/inlined_vector.h"
+#include "api/video/video_bitrate_allocation.h"
+#include "api/video/video_bitrate_allocator.h"
+#include "api/video/video_codec_constants.h"
+#include "api/video_codecs/video_codec.h"
+#include "rtc_base/experiments/stable_target_rate_experiment.h"
+
+namespace webrtc {
+
+class SvcRateAllocator : public VideoBitrateAllocator {
+ public:
+  explicit SvcRateAllocator(const VideoCodec& codec);
+
+  VideoBitrateAllocation Allocate(
+      VideoBitrateAllocationParameters parameters) override;
+
+  static DataRate GetMaxBitrate(const VideoCodec& codec);
+  static DataRate GetPaddingBitrate(const VideoCodec& codec);
+  static absl::InlinedVector<DataRate, kMaxSpatialLayers> GetLayerStartBitrates(
+      const VideoCodec& codec);
+
+ private:
+  struct NumLayers {
+    size_t spatial = 1;
+    size_t temporal = 1;
+  };
+
+  static NumLayers GetNumLayers(const VideoCodec& codec);
+  VideoBitrateAllocation GetAllocationNormalVideo(
+      DataRate total_bitrate,
+      size_t first_active_layer,
+      size_t num_spatial_layers) const;
+
+  VideoBitrateAllocation GetAllocationScreenSharing(
+      DataRate total_bitrate,
+      size_t first_active_layer,
+      size_t num_spatial_layers) const;
+
+  // Returns the number of layers that are active and have enough bitrate to
+  // actually be enabled.
+  size_t FindNumEnabledLayers(DataRate target_rate) const;
+
+  const VideoCodec codec_;
+  const NumLayers num_layers_;
+  const StableTargetRateExperiment experiment_settings_;
+  const absl::InlinedVector<DataRate, kMaxSpatialLayers>
+      cumulative_layer_start_bitrates_;
+  size_t last_active_layer_count_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_SVC_SVC_RATE_ALLOCATOR_H_