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diff --git a/third_party/libwebrtc/test/scenario/video_stream.h b/third_party/libwebrtc/test/scenario/video_stream.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 TEST_SCENARIO_VIDEO_STREAM_H_
+#define TEST_SCENARIO_VIDEO_STREAM_H_
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "rtc_base/synchronization/mutex.h"
+#include "test/fake_encoder.h"
+#include "test/fake_videorenderer.h"
+#include "test/frame_generator_capturer.h"
+#include "test/logging/log_writer.h"
+#include "test/scenario/call_client.h"
+#include "test/scenario/column_printer.h"
+#include "test/scenario/network_node.h"
+#include "test/scenario/scenario_config.h"
+#include "test/scenario/video_frame_matcher.h"
+#include "test/test_video_capturer.h"
+
+namespace webrtc {
+namespace test {
+// SendVideoStream provides an interface for changing parameters and retrieving
+// states at run time.
+class SendVideoStream {
+ public:
+  ~SendVideoStream();
+
+  SendVideoStream(const SendVideoStream&) = delete;
+  SendVideoStream& operator=(const SendVideoStream&) = delete;
+
+  void SetCaptureFramerate(int framerate);
+  VideoSendStream::Stats GetStats() const;
+  ColumnPrinter StatsPrinter();
+  void Start();
+  void Stop();
+  void UpdateConfig(std::function<void(VideoStreamConfig*)> modifier);
+  void UpdateActiveLayers(std::vector<bool> active_layers);
+  bool UsingSsrc(uint32_t ssrc) const;
+  bool UsingRtxSsrc(uint32_t ssrc) const;
+
+ private:
+  friend class Scenario;
+  friend class VideoStreamPair;
+  friend class ReceiveVideoStream;
+  // Handles RTCP feedback for this stream.
+  SendVideoStream(CallClient* sender,
+                  VideoStreamConfig config,
+                  Transport* send_transport,
+                  VideoFrameMatcher* matcher);
+
+  Mutex mutex_;
+  std::vector<uint32_t> ssrcs_;
+  std::vector<uint32_t> rtx_ssrcs_;
+  VideoSendStream* send_stream_ = nullptr;
+  CallClient* const sender_;
+  VideoStreamConfig config_ RTC_GUARDED_BY(mutex_);
+  std::unique_ptr<VideoEncoderFactory> encoder_factory_;
+  std::vector<test::FakeEncoder*> fake_encoders_ RTC_GUARDED_BY(mutex_);
+  std::unique_ptr<VideoBitrateAllocatorFactory> bitrate_allocator_factory_;
+  std::unique_ptr<FrameGeneratorCapturer> video_capturer_;
+  std::unique_ptr<ForwardingCapturedFrameTap> frame_tap_;
+  int next_local_network_id_ = 0;
+  int next_remote_network_id_ = 0;
+};
+
+// ReceiveVideoStream represents a video receiver. It can't be used directly.
+class ReceiveVideoStream {
+ public:
+  ~ReceiveVideoStream();
+
+  ReceiveVideoStream(const ReceiveVideoStream&) = delete;
+  ReceiveVideoStream& operator=(const ReceiveVideoStream&) = delete;
+
+  void Start();
+  void Stop();
+  VideoReceiveStreamInterface::Stats GetStats() const;
+
+ private:
+  friend class Scenario;
+  friend class VideoStreamPair;
+  ReceiveVideoStream(CallClient* receiver,
+                     VideoStreamConfig config,
+                     SendVideoStream* send_stream,
+                     size_t chosen_stream,
+                     Transport* feedback_transport,
+                     VideoFrameMatcher* matcher);
+
+  std::vector<VideoReceiveStreamInterface*> receive_streams_;
+  FlexfecReceiveStream* flecfec_stream_ = nullptr;
+  FakeVideoRenderer fake_renderer_;
+  std::vector<std::unique_ptr<rtc::VideoSinkInterface<VideoFrame>>>
+      render_taps_;
+  CallClient* const receiver_;
+  const VideoStreamConfig config_;
+  std::unique_ptr<VideoDecoderFactory> decoder_factory_;
+};
+
+// VideoStreamPair represents a video streaming session. It can be used to
+// access underlying send and receive classes. It can also be used in calls to
+// the Scenario class.
+class VideoStreamPair {
+ public:
+  ~VideoStreamPair();
+
+  VideoStreamPair(const VideoStreamPair&) = delete;
+  VideoStreamPair& operator=(const VideoStreamPair&) = delete;
+
+  SendVideoStream* send() { return &send_stream_; }
+  ReceiveVideoStream* receive() { return &receive_stream_; }
+  VideoFrameMatcher* matcher() { return &matcher_; }
+
+ private:
+  friend class Scenario;
+  VideoStreamPair(CallClient* sender,
+                  CallClient* receiver,
+                  VideoStreamConfig config);
+
+  const VideoStreamConfig config_;
+
+  VideoFrameMatcher matcher_;
+  SendVideoStream send_stream_;
+  ReceiveVideoStream receive_stream_;
+};
+
+std::vector<RtpExtension> GetVideoRtpExtensions(const VideoStreamConfig config);
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_SCENARIO_VIDEO_STREAM_H_