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diff --git a/third_party/libwebrtc/modules/video_coding/deprecated/stream_generator.h b/third_party/libwebrtc/modules/video_coding/deprecated/stream_generator.h
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+++ b/third_party/libwebrtc/modules/video_coding/deprecated/stream_generator.h
@@ -0,0 +1,74 @@
+/*
+ *  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 MODULES_VIDEO_CODING_DEPRECATED_STREAM_GENERATOR_H_
+#define MODULES_VIDEO_CODING_DEPRECATED_STREAM_GENERATOR_H_
+
+#include <stdint.h>
+
+#include <list>
+
+#include "modules/video_coding/deprecated/packet.h"
+
+namespace webrtc {
+
+const unsigned int kDefaultBitrateKbps = 1000;
+const unsigned int kDefaultFrameRate = 25;
+const unsigned int kMaxPacketSize = 1500;
+const unsigned int kFrameSize =
+    (kDefaultBitrateKbps + kDefaultFrameRate * 4) / (kDefaultFrameRate * 8);
+const int kDefaultFramePeriodMs = 1000 / kDefaultFrameRate;
+
+class StreamGenerator {
+ public:
+  StreamGenerator(uint16_t start_seq_num, int64_t current_time);
+
+  StreamGenerator(const StreamGenerator&) = delete;
+  StreamGenerator& operator=(const StreamGenerator&) = delete;
+
+  void Init(uint16_t start_seq_num, int64_t current_time);
+
+  // `time_ms` denotes the timestamp you want to put on the frame, and the unit
+  // is millisecond. GenerateFrame will translate `time_ms` into a 90kHz
+  // timestamp and put it on the frame.
+  void GenerateFrame(VideoFrameType type,
+                     int num_media_packets,
+                     int num_empty_packets,
+                     int64_t time_ms);
+
+  bool PopPacket(VCMPacket* packet, int index);
+  void DropLastPacket();
+
+  bool GetPacket(VCMPacket* packet, int index);
+
+  bool NextPacket(VCMPacket* packet);
+
+  uint16_t NextSequenceNumber() const;
+
+  int PacketsRemaining() const;
+
+ private:
+  VCMPacket GeneratePacket(uint16_t sequence_number,
+                           uint32_t timestamp,
+                           unsigned int size,
+                           bool first_packet,
+                           bool marker_bit,
+                           VideoFrameType type);
+
+  std::list<VCMPacket>::iterator GetPacketIterator(int index);
+
+  std::list<VCMPacket> packets_;
+  uint16_t sequence_number_;
+  int64_t start_time_;
+  uint8_t packet_buffer_[kMaxPacketSize];
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_DEPRECATED_STREAM_GENERATOR_H_