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diff --git a/third_party/libwebrtc/media/base/video_source_base.h b/third_party/libwebrtc/media/base/video_source_base.h
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+/*
+ *  Copyright (c) 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 MEDIA_BASE_VIDEO_SOURCE_BASE_H_
+#define MEDIA_BASE_VIDEO_SOURCE_BASE_H_
+
+#include <vector>
+
+#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 "rtc_base/system/no_unique_address.h"
+
+namespace rtc {
+
+// VideoSourceBase is not thread safe. Before using this class, consider using
+// VideoSourceBaseGuarded below instead, which is an identical implementation
+// but applies a sequence checker to help protect internal state.
+// TODO(bugs.webrtc.org/12780): Delete this class.
+class VideoSourceBase : public VideoSourceInterface<webrtc::VideoFrame> {
+ public:
+  VideoSourceBase();
+  ~VideoSourceBase() override;
+  void AddOrUpdateSink(VideoSinkInterface<webrtc::VideoFrame>* sink,
+                       const VideoSinkWants& wants) override;
+  void RemoveSink(VideoSinkInterface<webrtc::VideoFrame>* sink) override;
+
+ protected:
+  struct SinkPair {
+    SinkPair(VideoSinkInterface<webrtc::VideoFrame>* sink, VideoSinkWants wants)
+        : sink(sink), wants(wants) {}
+    VideoSinkInterface<webrtc::VideoFrame>* sink;
+    VideoSinkWants wants;
+  };
+  SinkPair* FindSinkPair(const VideoSinkInterface<webrtc::VideoFrame>* sink);
+
+  const std::vector<SinkPair>& sink_pairs() const { return sinks_; }
+
+ private:
+  std::vector<SinkPair> sinks_;
+};
+
+// VideoSourceBaseGuarded assumes that operations related to sinks, occur on the
+// same TQ/thread that the object was constructed on.
+class VideoSourceBaseGuarded : public VideoSourceInterface<webrtc::VideoFrame> {
+ public:
+  VideoSourceBaseGuarded();
+  ~VideoSourceBaseGuarded() override;
+
+  void AddOrUpdateSink(VideoSinkInterface<webrtc::VideoFrame>* sink,
+                       const VideoSinkWants& wants) override;
+  void RemoveSink(VideoSinkInterface<webrtc::VideoFrame>* sink) override;
+
+ protected:
+  struct SinkPair {
+    SinkPair(VideoSinkInterface<webrtc::VideoFrame>* sink, VideoSinkWants wants)
+        : sink(sink), wants(wants) {}
+    VideoSinkInterface<webrtc::VideoFrame>* sink;
+    VideoSinkWants wants;
+  };
+
+  SinkPair* FindSinkPair(const VideoSinkInterface<webrtc::VideoFrame>* sink);
+  const std::vector<SinkPair>& sink_pairs() const;
+
+  // Keep the `source_sequence_` checker protected to allow sub classes the
+  // ability to call Detach() if/when appropriate.
+  RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker source_sequence_;
+
+ private:
+  std::vector<SinkPair> sinks_ RTC_GUARDED_BY(&source_sequence_);
+};
+
+}  // namespace rtc
+
+#endif  // MEDIA_BASE_VIDEO_SOURCE_BASE_H_