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diff --git a/third_party/libwebrtc/video/config/simulcast.h b/third_party/libwebrtc/video/config/simulcast.h
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+++ b/third_party/libwebrtc/video/config/simulcast.h
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+/*
+ *  Copyright (c) 2014 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_CONFIG_SIMULCAST_H_
+#define VIDEO_CONFIG_SIMULCAST_H_
+
+#include <stddef.h>
+
+#include <vector>
+
+#include "api/field_trials_view.h"
+#include "api/units/data_rate.h"
+#include "video/config/video_encoder_config.h"
+
+namespace cricket {
+
+// Gets the total maximum bitrate for the `streams`.
+webrtc::DataRate GetTotalMaxBitrate(
+    const std::vector<webrtc::VideoStream>& streams);
+
+// Adds any bitrate of `max_bitrate` that is above the total maximum bitrate for
+// the `layers` to the highest quality layer.
+void BoostMaxSimulcastLayer(webrtc::DataRate max_bitrate,
+                            std::vector<webrtc::VideoStream>* layers);
+
+// Round size to nearest simulcast-friendly size
+int NormalizeSimulcastSize(int size, size_t simulcast_layers);
+
+// Gets simulcast settings.
+std::vector<webrtc::VideoStream> GetSimulcastConfig(
+    size_t min_layers,
+    size_t max_layers,
+    int width,
+    int height,
+    double bitrate_priority,
+    int max_qp,
+    bool is_screenshare_with_conference_mode,
+    bool temporal_layers_supported,
+    const webrtc::FieldTrialsView& trials);
+
+// Gets the simulcast config layers for a non-screensharing case.
+std::vector<webrtc::VideoStream> GetNormalSimulcastLayers(
+    size_t max_layers,
+    int width,
+    int height,
+    double bitrate_priority,
+    int max_qp,
+    bool temporal_layers_supported,
+    bool base_heavy_tl3_rate_alloc,
+    const webrtc::FieldTrialsView& trials);
+
+// Gets simulcast config layers for screenshare settings.
+std::vector<webrtc::VideoStream> GetScreenshareLayers(
+    size_t max_layers,
+    int width,
+    int height,
+    double bitrate_priority,
+    int max_qp,
+    bool temporal_layers_supported,
+    bool base_heavy_tl3_rate_alloc,
+    const webrtc::FieldTrialsView& trials);
+
+}  // namespace cricket
+
+#endif  // VIDEO_CONFIG_SIMULCAST_H_