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diff --git a/third_party/libwebrtc/pc/video_track.h b/third_party/libwebrtc/pc/video_track.h
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+++ b/third_party/libwebrtc/pc/video_track.h
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+/*
+ *  Copyright 2012 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 PC_VIDEO_TRACK_H_
+#define PC_VIDEO_TRACK_H_
+
+#include <string>
+
+#include "absl/types/optional.h"
+#include "api/media_stream_interface.h"
+#include "api/media_stream_track.h"
+#include "api/scoped_refptr.h"
+#include "api/sequence_checker.h"
+#include "api/video/video_frame.h"
+#include "api/video/video_sink_interface.h"
+#include "api/video/video_source_interface.h"
+#include "media/base/video_source_base.h"
+#include "pc/video_track_source_proxy.h"
+#include "rtc_base/system/no_unique_address.h"
+#include "rtc_base/thread.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+
+// TODO(tommi): Instead of inheriting from `MediaStreamTrack<>`, implement the
+// properties directly in this class. `MediaStreamTrack` doesn't guard against
+// conflicting access, so we'd need to override those methods anyway in this
+// class in order to make sure things are correctly checked.
+class VideoTrack : public MediaStreamTrack<VideoTrackInterface>,
+                   public rtc::VideoSourceBaseGuarded,
+                   public ObserverInterface {
+ public:
+  static rtc::scoped_refptr<VideoTrack> Create(
+      absl::string_view label,
+      rtc::scoped_refptr<VideoTrackSourceInterface> source,
+      rtc::Thread* worker_thread);
+
+  void AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
+                       const rtc::VideoSinkWants& wants) override;
+  void RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) override;
+  void RequestRefreshFrame() override;
+  VideoTrackSourceInterface* GetSource() const override;
+
+  ContentHint content_hint() const override;
+  void set_content_hint(ContentHint hint) override;
+  bool set_enabled(bool enable) override;
+  bool enabled() const override;
+  MediaStreamTrackInterface::TrackState state() const override;
+  std::string kind() const override;
+
+  // Direct access to the non-proxied source object for internal implementation.
+  VideoTrackSourceInterface* GetSourceInternal() const;
+
+ protected:
+  VideoTrack(
+      absl::string_view id,
+      rtc::scoped_refptr<
+          VideoTrackSourceProxyWithInternal<VideoTrackSourceInterface>> source,
+      rtc::Thread* worker_thread);
+  ~VideoTrack();
+
+ private:
+  // Implements ObserverInterface. Observes `video_source_` state.
+  void OnChanged() override;
+
+  RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker signaling_thread_;
+  rtc::Thread* const worker_thread_;
+  const rtc::scoped_refptr<
+      VideoTrackSourceProxyWithInternal<VideoTrackSourceInterface>>
+      video_source_;
+  ContentHint content_hint_ RTC_GUARDED_BY(&signaling_thread_);
+  // Cached `enabled` state for the worker thread. This is kept in sync with
+  // the state maintained on the signaling thread via set_enabled() but can
+  // be queried without blocking on the worker thread by callers that don't
+  // use an api proxy to call the `enabled()` method.
+  bool enabled_w_ RTC_GUARDED_BY(worker_thread_) = true;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_VIDEO_TRACK_H_