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diff --git a/third_party/libwebrtc/video/alignment_adjuster.h b/third_party/libwebrtc/video/alignment_adjuster.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 VIDEO_ALIGNMENT_ADJUSTER_H_
+#define VIDEO_ALIGNMENT_ADJUSTER_H_
+
+#include "api/video_codecs/video_encoder.h"
+#include "video/config/video_encoder_config.h"
+
+namespace webrtc {
+
+class AlignmentAdjuster {
+ public:
+  // Returns the resolution alignment requested by the encoder (i.e
+  // `EncoderInfo::requested_resolution_alignment` which ensures that delivered
+  // frames to the encoder are divisible by this alignment).
+  //
+  // If `EncoderInfo::apply_alignment_to_all_simulcast_layers` is enabled, the
+  // alignment will be adjusted to ensure that each simulcast layer also is
+  // divisible by `requested_resolution_alignment`. The configured scale factors
+  // `scale_resolution_down_by` may be adjusted to a common multiple to limit
+  // the alignment value to avoid largely cropped frames and possibly with an
+  // aspect ratio far from the original.
+
+  // Note: `max_layers` currently only taken into account when using default
+  // scale factors.
+  static int GetAlignmentAndMaybeAdjustScaleFactors(
+      const VideoEncoder::EncoderInfo& info,
+      VideoEncoderConfig* config,
+      absl::optional<size_t> max_layers);
+};
+
+}  // namespace webrtc
+
+#endif  // VIDEO_ALIGNMENT_ADJUSTER_H_