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diff --git a/third_party/libwebrtc/api/video_track_source_constraints.h b/third_party/libwebrtc/api/video_track_source_constraints.h
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+++ b/third_party/libwebrtc/api/video_track_source_constraints.h
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+/*
+ *  Copyright 2021 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.
+ */
+
+// This file contains interfaces for MediaStream, MediaTrack and MediaSource.
+// These interfaces are used for implementing MediaStream and MediaTrack as
+// defined in http://dev.w3.org/2011/webrtc/editor/webrtc.html#stream-api. These
+// interfaces must be used only with PeerConnection.
+
+#ifndef API_VIDEO_TRACK_SOURCE_CONSTRAINTS_H_
+#define API_VIDEO_TRACK_SOURCE_CONSTRAINTS_H_
+
+#include "absl/types/optional.h"
+
+namespace webrtc {
+
+// This struct definition describes constraints on the video source that may be
+// set with VideoTrackSourceInterface::ProcessConstraints.
+struct VideoTrackSourceConstraints {
+  absl::optional<double> min_fps;
+  absl::optional<double> max_fps;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_TRACK_SOURCE_CONSTRAINTS_H_