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diff --git a/third_party/libwebrtc/pc/video_rtp_track_source.h b/third_party/libwebrtc/pc/video_rtp_track_source.h
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+++ b/third_party/libwebrtc/pc/video_rtp_track_source.h
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+/*
+ *  Copyright 2019 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_RTP_TRACK_SOURCE_H_
+#define PC_VIDEO_RTP_TRACK_SOURCE_H_
+
+#include <vector>
+
+#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/video_broadcaster.h"
+#include "pc/video_track_source.h"
+#include "rtc_base/synchronization/mutex.h"
+#include "rtc_base/system/no_unique_address.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+
+// Video track source in use by VideoRtpReceiver
+class VideoRtpTrackSource : public VideoTrackSource {
+ public:
+  class Callback {
+   public:
+    virtual ~Callback() = default;
+
+    // Called when a keyframe should be generated
+    virtual void OnGenerateKeyFrame() = 0;
+
+    // Called when the implementor should eventually start to serve encoded
+    // frames using BroadcastEncodedFrameBuffer.
+    // The implementor should cause a keyframe to be eventually generated.
+    virtual void OnEncodedSinkEnabled(bool enable) = 0;
+  };
+
+  explicit VideoRtpTrackSource(Callback* callback);
+
+  VideoRtpTrackSource(const VideoRtpTrackSource&) = delete;
+  VideoRtpTrackSource& operator=(const VideoRtpTrackSource&) = delete;
+
+  // Call before the object implementing Callback finishes it's destructor. No
+  // more callbacks will be fired after completion. Must be called on the
+  // worker thread
+  void ClearCallback();
+
+  // Call to broadcast an encoded frame to registered sinks.
+  // This method can be called on any thread or queue.
+  void BroadcastRecordableEncodedFrame(
+      const RecordableEncodedFrame& frame) const;
+
+  // VideoTrackSource
+  rtc::VideoSourceInterface<VideoFrame>* source() override;
+  rtc::VideoSinkInterface<VideoFrame>* sink();
+
+  // Returns true. This method can be called on any thread.
+  bool SupportsEncodedOutput() const override;
+
+  // Generates a key frame. Must be called on the worker thread.
+  void GenerateKeyFrame() override;
+
+  // Adds an encoded sink. Must be called on the worker thread.
+  void AddEncodedSink(
+      rtc::VideoSinkInterface<RecordableEncodedFrame>* sink) override;
+
+  // Removes an encoded sink. Must be called on the worker thread.
+  void RemoveEncodedSink(
+      rtc::VideoSinkInterface<RecordableEncodedFrame>* sink) override;
+
+ private:
+  RTC_NO_UNIQUE_ADDRESS SequenceChecker worker_sequence_checker_;
+  // `broadcaster_` is needed since the decoder can only handle one sink.
+  // It might be better if the decoder can handle multiple sinks and consider
+  // the VideoSinkWants.
+  rtc::VideoBroadcaster broadcaster_;
+  mutable Mutex mu_;
+  std::vector<rtc::VideoSinkInterface<RecordableEncodedFrame>*> encoded_sinks_
+      RTC_GUARDED_BY(mu_);
+  Callback* callback_ RTC_GUARDED_BY(worker_sequence_checker_);
+};
+
+}  // namespace webrtc
+
+#endif  // PC_VIDEO_RTP_TRACK_SOURCE_H_