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diff --git a/third_party/libwebrtc/api/video/video_layers_allocation.h b/third_party/libwebrtc/api/video/video_layers_allocation.h
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+++ b/third_party/libwebrtc/api/video/video_layers_allocation.h
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+/*
+ *  Copyright (c) 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 API_VIDEO_VIDEO_LAYERS_ALLOCATION_H_
+#define API_VIDEO_VIDEO_LAYERS_ALLOCATION_H_
+
+#include <cstdint>
+
+#include "absl/container/inlined_vector.h"
+#include "api/units/data_rate.h"
+
+namespace webrtc {
+
+// This struct contains additional stream-level information needed by a
+// Selective Forwarding Middlebox to make relay decisions of RTP streams.
+struct VideoLayersAllocation {
+  static constexpr int kMaxSpatialIds = 4;
+  static constexpr int kMaxTemporalIds = 4;
+
+  friend bool operator==(const VideoLayersAllocation& lhs,
+                         const VideoLayersAllocation& rhs) {
+    return lhs.rtp_stream_index == rhs.rtp_stream_index &&
+           lhs.resolution_and_frame_rate_is_valid ==
+               rhs.resolution_and_frame_rate_is_valid &&
+           lhs.active_spatial_layers == rhs.active_spatial_layers;
+  }
+
+  friend bool operator!=(const VideoLayersAllocation& lhs,
+                         const VideoLayersAllocation& rhs) {
+    return !(lhs == rhs);
+  }
+
+  struct SpatialLayer {
+    friend bool operator==(const SpatialLayer& lhs, const SpatialLayer& rhs) {
+      return lhs.rtp_stream_index == rhs.rtp_stream_index &&
+             lhs.spatial_id == rhs.spatial_id &&
+             lhs.target_bitrate_per_temporal_layer ==
+                 rhs.target_bitrate_per_temporal_layer &&
+             lhs.width == rhs.width && lhs.height == rhs.height &&
+             lhs.frame_rate_fps == rhs.frame_rate_fps;
+    }
+
+    friend bool operator!=(const SpatialLayer& lhs, const SpatialLayer& rhs) {
+      return !(lhs == rhs);
+    }
+    int rtp_stream_index = 0;
+    // Index of the spatial layer per `rtp_stream_index`.
+    int spatial_id = 0;
+    // Target bitrate per decode target.
+    absl::InlinedVector<DataRate, kMaxTemporalIds>
+        target_bitrate_per_temporal_layer;
+
+    // These fields are only valid if `resolution_and_frame_rate_is_valid` is
+    // true
+    uint16_t width = 0;
+    uint16_t height = 0;
+    // Max frame rate used in any temporal layer of this spatial layer.
+    uint8_t frame_rate_fps = 0;
+  };
+
+  // Index of the rtp stream this allocation is sent on. Used for mapping
+  // a SpatialLayer to a rtp stream.
+  int rtp_stream_index = 0;
+  bool resolution_and_frame_rate_is_valid = false;
+  absl::InlinedVector<SpatialLayer, kMaxSpatialIds> active_spatial_layers;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_VIDEO_LAYERS_ALLOCATION_H_