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diff --git a/third_party/libwebrtc/pc/video_track_source.h b/third_party/libwebrtc/pc/video_track_source.h
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+++ b/third_party/libwebrtc/pc/video_track_source.h
@@ -0,0 +1,73 @@
+/*
+ *  Copyright 2016 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_SOURCE_H_
+#define PC_VIDEO_TRACK_SOURCE_H_
+
+#include "absl/types/optional.h"
+#include "api/media_stream_interface.h"
+#include "api/notifier.h"
+#include "api/sequence_checker.h"
+#include "api/video/recordable_encoded_frame.h"
+#include "api/video/video_frame.h"
+#include "api/video/video_sink_interface.h"
+#include "api/video/video_source_interface.h"
+#include "media/base/media_channel.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/system/no_unique_address.h"
+#include "rtc_base/system/rtc_export.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+
+// VideoTrackSource is a convenience base class for implementations of
+// VideoTrackSourceInterface.
+class RTC_EXPORT VideoTrackSource : public Notifier<VideoTrackSourceInterface> {
+ public:
+  explicit VideoTrackSource(bool remote);
+  void SetState(SourceState new_state);
+
+  SourceState state() const override {
+    RTC_DCHECK_RUN_ON(&signaling_thread_checker_);
+    return state_;
+  }
+  bool remote() const override { return remote_; }
+
+  bool is_screencast() const override { return false; }
+  absl::optional<bool> needs_denoising() const override {
+    return absl::nullopt;
+  }
+
+  bool GetStats(Stats* stats) override { return false; }
+
+  void AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
+                       const rtc::VideoSinkWants& wants) override;
+  void RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) override;
+
+  bool SupportsEncodedOutput() const override { return false; }
+  void GenerateKeyFrame() override {}
+  void AddEncodedSink(
+      rtc::VideoSinkInterface<RecordableEncodedFrame>* sink) override {}
+  void RemoveEncodedSink(
+      rtc::VideoSinkInterface<RecordableEncodedFrame>* sink) override {}
+
+ protected:
+  virtual rtc::VideoSourceInterface<VideoFrame>* source() = 0;
+
+ private:
+  RTC_NO_UNIQUE_ADDRESS SequenceChecker worker_thread_checker_;
+  RTC_NO_UNIQUE_ADDRESS SequenceChecker signaling_thread_checker_;
+  SourceState state_ RTC_GUARDED_BY(&signaling_thread_checker_);
+  const bool remote_;
+};
+
+}  // namespace webrtc
+
+#endif  //  PC_VIDEO_TRACK_SOURCE_H_