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diff --git a/third_party/libwebrtc/pc/test/frame_generator_capturer_video_track_source.h b/third_party/libwebrtc/pc/test/frame_generator_capturer_video_track_source.h
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+/*
+ *  Copyright 2018 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_TEST_FRAME_GENERATOR_CAPTURER_VIDEO_TRACK_SOURCE_H_
+#define PC_TEST_FRAME_GENERATOR_CAPTURER_VIDEO_TRACK_SOURCE_H_
+
+#include <memory>
+#include <utility>
+
+#include "api/task_queue/default_task_queue_factory.h"
+#include "api/task_queue/task_queue_factory.h"
+#include "api/test/create_frame_generator.h"
+#include "pc/video_track_source.h"
+#include "test/frame_generator_capturer.h"
+
+namespace webrtc {
+
+// Implements a VideoTrackSourceInterface to be used for creating VideoTracks.
+// The video source is generated using a FrameGeneratorCapturer, specifically
+// a SquareGenerator that generates frames with randomly sized and colored
+// squares.
+class FrameGeneratorCapturerVideoTrackSource : public VideoTrackSource {
+ public:
+  static const int kDefaultFramesPerSecond = 30;
+  static const int kDefaultWidth = 640;
+  static const int kDefaultHeight = 480;
+  static const int kNumSquaresGenerated = 50;
+
+  struct Config {
+    int frames_per_second = kDefaultFramesPerSecond;
+    int width = kDefaultWidth;
+    int height = kDefaultHeight;
+    int num_squares_generated = 50;
+  };
+
+  FrameGeneratorCapturerVideoTrackSource(Config config,
+                                         Clock* clock,
+                                         bool is_screencast)
+      : VideoTrackSource(false /* remote */),
+        task_queue_factory_(CreateDefaultTaskQueueFactory()),
+        is_screencast_(is_screencast) {
+    video_capturer_ = std::make_unique<test::FrameGeneratorCapturer>(
+        clock,
+        test::CreateSquareFrameGenerator(config.width, config.height,
+                                         absl::nullopt,
+                                         config.num_squares_generated),
+        config.frames_per_second, *task_queue_factory_);
+    video_capturer_->Init();
+  }
+
+  FrameGeneratorCapturerVideoTrackSource(
+      std::unique_ptr<test::FrameGeneratorCapturer> video_capturer,
+      bool is_screencast)
+      : VideoTrackSource(false /* remote */),
+        video_capturer_(std::move(video_capturer)),
+        is_screencast_(is_screencast) {}
+
+  ~FrameGeneratorCapturerVideoTrackSource() = default;
+
+  void Start() { SetState(kLive); }
+
+  void Stop() { SetState(kMuted); }
+
+  bool is_screencast() const override { return is_screencast_; }
+
+ protected:
+  rtc::VideoSourceInterface<VideoFrame>* source() override {
+    return video_capturer_.get();
+  }
+
+ private:
+  const std::unique_ptr<TaskQueueFactory> task_queue_factory_;
+  std::unique_ptr<test::FrameGeneratorCapturer> video_capturer_;
+  const bool is_screencast_;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_TEST_FRAME_GENERATOR_CAPTURER_VIDEO_TRACK_SOURCE_H_