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diff --git a/third_party/libwebrtc/test/frame_generator_capturer.h b/third_party/libwebrtc/test/frame_generator_capturer.h
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+++ b/third_party/libwebrtc/test/frame_generator_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_FRAME_GENERATOR_CAPTURER_H_
+#define TEST_FRAME_GENERATOR_CAPTURER_H_
+
+#include <memory>
+#include <string>
+
+#include "api/task_queue/task_queue_factory.h"
+#include "api/test/frame_generator_interface.h"
+#include "api/video/video_frame.h"
+#include "rtc_base/synchronization/mutex.h"
+#include "rtc_base/task_queue.h"
+#include "rtc_base/task_utils/repeating_task.h"
+#include "system_wrappers/include/clock.h"
+#include "test/test_video_capturer.h"
+
+namespace webrtc {
+
+namespace test {
+namespace frame_gen_cap_impl {
+template <typename T>
+class AutoOpt : public absl::optional<T> {
+ public:
+  using absl::optional<T>::optional;
+  T* operator->() {
+    if (!absl::optional<T>::has_value())
+      this->emplace(T());
+    return absl::optional<T>::operator->();
+  }
+};
+}  // namespace frame_gen_cap_impl
+struct FrameGeneratorCapturerConfig {
+  struct SquaresVideo {
+    int framerate = 30;
+    FrameGeneratorInterface::OutputType pixel_format =
+        FrameGeneratorInterface::OutputType::kI420;
+    int width = 320;
+    int height = 180;
+    int num_squares = 10;
+  };
+
+  struct SquareSlides {
+    int framerate = 30;
+    TimeDelta change_interval = TimeDelta::Seconds(10);
+    int width = 1600;
+    int height = 1200;
+  };
+
+  struct VideoFile {
+    int framerate = 30;
+    std::string name;
+    // Must be set to width and height of the source video file.
+    int width = 0;
+    int height = 0;
+  };
+
+  struct ImageSlides {
+    int framerate = 30;
+    TimeDelta change_interval = TimeDelta::Seconds(10);
+    struct Crop {
+      TimeDelta scroll_duration = TimeDelta::Seconds(0);
+      absl::optional<int> width;
+      absl::optional<int> height;
+    } crop;
+    int width = 1850;
+    int height = 1110;
+    std::vector<std::string> paths = {
+        "web_screenshot_1850_1110",
+        "presentation_1850_1110",
+        "photo_1850_1110",
+        "difficult_photo_1850_1110",
+    };
+  };
+
+  frame_gen_cap_impl::AutoOpt<SquaresVideo> squares_video;
+  frame_gen_cap_impl::AutoOpt<SquareSlides> squares_slides;
+  frame_gen_cap_impl::AutoOpt<VideoFile> video_file;
+  frame_gen_cap_impl::AutoOpt<ImageSlides> image_slides;
+};
+
+class FrameGeneratorCapturer : public TestVideoCapturer {
+ public:
+  class SinkWantsObserver {
+   public:
+    // OnSinkWantsChanged is called when FrameGeneratorCapturer::AddOrUpdateSink
+    // is called.
+    virtual void OnSinkWantsChanged(rtc::VideoSinkInterface<VideoFrame>* sink,
+                                    const rtc::VideoSinkWants& wants) = 0;
+
+   protected:
+    virtual ~SinkWantsObserver() {}
+  };
+
+  FrameGeneratorCapturer(
+      Clock* clock,
+      std::unique_ptr<FrameGeneratorInterface> frame_generator,
+      int target_fps,
+      TaskQueueFactory& task_queue_factory);
+  virtual ~FrameGeneratorCapturer();
+
+  static std::unique_ptr<FrameGeneratorCapturer> Create(
+      Clock* clock,
+      TaskQueueFactory& task_queue_factory,
+      FrameGeneratorCapturerConfig::SquaresVideo config);
+  static std::unique_ptr<FrameGeneratorCapturer> Create(
+      Clock* clock,
+      TaskQueueFactory& task_queue_factory,
+      FrameGeneratorCapturerConfig::SquareSlides config);
+  static std::unique_ptr<FrameGeneratorCapturer> Create(
+      Clock* clock,
+      TaskQueueFactory& task_queue_factory,
+      FrameGeneratorCapturerConfig::VideoFile config);
+  static std::unique_ptr<FrameGeneratorCapturer> Create(
+      Clock* clock,
+      TaskQueueFactory& task_queue_factory,
+      FrameGeneratorCapturerConfig::ImageSlides config);
+  static std::unique_ptr<FrameGeneratorCapturer> Create(
+      Clock* clock,
+      TaskQueueFactory& task_queue_factory,
+      const FrameGeneratorCapturerConfig& config);
+
+  void Start();
+  void Stop();
+  void ChangeResolution(size_t width, size_t height);
+  void ChangeFramerate(int target_framerate);
+
+  struct Resolution {
+    int width;
+    int height;
+  };
+  absl::optional<Resolution> GetResolution();
+
+  void OnOutputFormatRequest(int width,
+                             int height,
+                             const absl::optional<int>& max_fps);
+
+  void SetSinkWantsObserver(SinkWantsObserver* observer);
+
+  void AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
+                       const rtc::VideoSinkWants& wants) override;
+  void RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) override;
+
+  void ForceFrame();
+  void SetFakeRotation(VideoRotation rotation);
+  void SetFakeColorSpace(absl::optional<ColorSpace> color_space);
+
+  int64_t first_frame_capture_time() const { return first_frame_capture_time_; }
+
+  bool Init();
+
+ private:
+  void InsertFrame();
+  static bool Run(void* obj);
+  int GetCurrentConfiguredFramerate();
+  void UpdateFps(int max_fps) RTC_EXCLUSIVE_LOCKS_REQUIRED(&lock_);
+
+  Clock* const clock_;
+  RepeatingTaskHandle frame_task_;
+  bool sending_;
+  SinkWantsObserver* sink_wants_observer_ RTC_GUARDED_BY(&lock_);
+
+  Mutex lock_;
+  std::unique_ptr<FrameGeneratorInterface> frame_generator_;
+
+  int source_fps_ RTC_GUARDED_BY(&lock_);
+  int target_capture_fps_ RTC_GUARDED_BY(&lock_);
+  absl::optional<int> wanted_fps_ RTC_GUARDED_BY(&lock_);
+  VideoRotation fake_rotation_ = kVideoRotation_0;
+  absl::optional<ColorSpace> fake_color_space_ RTC_GUARDED_BY(&lock_);
+
+  int64_t first_frame_capture_time_;
+
+  Mutex stats_lock_;
+  absl::optional<Resolution> source_resolution_ RTC_GUARDED_BY(&stats_lock_);
+
+  // Must be the last field, so it will be deconstructed first as tasks
+  // in the TaskQueue access other fields of the instance of this class.
+  rtc::TaskQueue task_queue_;
+};
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_FRAME_GENERATOR_CAPTURER_H_