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diff --git a/third_party/libwebrtc/test/test_video_capturer.h b/third_party/libwebrtc/test/test_video_capturer.h
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+/*
+ *  Copyright (c) 2013 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 TEST_TEST_VIDEO_CAPTURER_H_
+#define TEST_TEST_VIDEO_CAPTURER_H_
+
+#include <stddef.h>
+
+#include <memory>
+
+#include "api/video/video_frame.h"
+#include "api/video/video_source_interface.h"
+#include "media/base/video_adapter.h"
+#include "media/base/video_broadcaster.h"
+#include "rtc_base/synchronization/mutex.h"
+
+namespace webrtc {
+namespace test {
+
+class TestVideoCapturer : public rtc::VideoSourceInterface<VideoFrame> {
+ public:
+  class FramePreprocessor {
+   public:
+    virtual ~FramePreprocessor() = default;
+
+    virtual VideoFrame Preprocess(const VideoFrame& frame) = 0;
+  };
+
+  ~TestVideoCapturer() override;
+
+  void AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
+                       const rtc::VideoSinkWants& wants) override;
+  void RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) override;
+  void SetFramePreprocessor(std::unique_ptr<FramePreprocessor> preprocessor) {
+    MutexLock lock(&lock_);
+    preprocessor_ = std::move(preprocessor);
+  }
+  void OnOutputFormatRequest(int width,
+                             int height,
+                             const absl::optional<int>& max_fps);
+
+ protected:
+  void OnFrame(const VideoFrame& frame);
+  rtc::VideoSinkWants GetSinkWants();
+
+ private:
+  void UpdateVideoAdapter();
+  VideoFrame MaybePreprocess(const VideoFrame& frame);
+
+  Mutex lock_;
+  std::unique_ptr<FramePreprocessor> preprocessor_ RTC_GUARDED_BY(lock_);
+  rtc::VideoBroadcaster broadcaster_;
+  cricket::VideoAdapter video_adapter_;
+};
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_TEST_VIDEO_CAPTURER_H_