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diff --git a/third_party/libwebrtc/media/engine/encoder_simulcast_proxy.h b/third_party/libwebrtc/media/engine/encoder_simulcast_proxy.h
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+++ b/third_party/libwebrtc/media/engine/encoder_simulcast_proxy.h
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+/*
+ *  Copyright (c) 2017 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 MEDIA_ENGINE_ENCODER_SIMULCAST_PROXY_H_
+#define MEDIA_ENGINE_ENCODER_SIMULCAST_PROXY_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <memory>
+#include <vector>
+
+#include "api/video/video_bitrate_allocation.h"
+#include "api/video/video_frame.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "api/video_codecs/video_codec.h"
+#include "api/video_codecs/video_encoder.h"
+#include "api/video_codecs/video_encoder_factory.h"
+#include "modules/video_coding/include/video_codec_interface.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// This class provides fallback to SimulcastEncoderAdapter if default VP8Encoder
+// doesn't support simulcast for provided settings.
+class RTC_EXPORT EncoderSimulcastProxy : public VideoEncoder {
+ public:
+  EncoderSimulcastProxy(VideoEncoderFactory* factory,
+                        const SdpVideoFormat& format);
+  ~EncoderSimulcastProxy() override;
+
+  // Implements VideoEncoder.
+  int Release() override;
+  void SetFecControllerOverride(
+      FecControllerOverride* fec_controller_override) override;
+  int InitEncode(const VideoCodec* codec_settings,
+                 const VideoEncoder::Settings& settings) override;
+  int Encode(const VideoFrame& input_image,
+             const std::vector<VideoFrameType>* frame_types) override;
+  int RegisterEncodeCompleteCallback(EncodedImageCallback* callback) override;
+  void SetRates(const RateControlParameters& parameters) override;
+  void OnPacketLossRateUpdate(float packet_loss_rate) override;
+  void OnRttUpdate(int64_t rtt_ms) override;
+  void OnLossNotification(const LossNotification& loss_notification) override;
+  EncoderInfo GetEncoderInfo() const override;
+
+ private:
+  VideoEncoderFactory* const factory_;
+  SdpVideoFormat video_format_;
+  std::unique_ptr<VideoEncoder> encoder_;
+  EncodedImageCallback* callback_;
+};
+
+}  // namespace webrtc
+
+#endif  // MEDIA_ENGINE_ENCODER_SIMULCAST_PROXY_H_