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diff --git a/third_party/libwebrtc/modules/video_coding/codecs/h264/h264_encoder_impl.h b/third_party/libwebrtc/modules/video_coding/codecs/h264/h264_encoder_impl.h
new file mode 100644
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+++ b/third_party/libwebrtc/modules/video_coding/codecs/h264/h264_encoder_impl.h
@@ -0,0 +1,126 @@
+/*
+ *  Copyright (c) 2015 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_CODECS_H264_H264_ENCODER_IMPL_H_
+#define MODULES_VIDEO_CODING_CODECS_H264_H264_ENCODER_IMPL_H_
+
+// Everything declared in this header is only required when WebRTC is
+// build with H264 support, please do not move anything out of the
+// #ifdef unless needed and tested.
+#ifdef WEBRTC_USE_H264
+
+#if defined(WEBRTC_WIN) && !defined(__clang__)
+#error "See: bugs.webrtc.org/9213#c13."
+#endif
+
+#include <memory>
+#include <vector>
+
+#include "absl/container/inlined_vector.h"
+#include "api/transport/rtp/dependency_descriptor.h"
+#include "api/video/i420_buffer.h"
+#include "api/video/video_codec_constants.h"
+#include "api/video_codecs/scalability_mode.h"
+#include "api/video_codecs/video_encoder.h"
+#include "common_video/h264/h264_bitstream_parser.h"
+#include "modules/video_coding/codecs/h264/include/h264.h"
+#include "modules/video_coding/svc/scalable_video_controller.h"
+#include "modules/video_coding/utility/quality_scaler.h"
+#include "third_party/openh264/src/codec/api/wels/codec_app_def.h"
+
+class ISVCEncoder;
+
+namespace webrtc {
+
+class H264EncoderImpl : public H264Encoder {
+ public:
+  struct LayerConfig {
+    int simulcast_idx = 0;
+    int width = -1;
+    int height = -1;
+    bool sending = true;
+    bool key_frame_request = false;
+    float max_frame_rate = 0;
+    uint32_t target_bps = 0;
+    uint32_t max_bps = 0;
+    bool frame_dropping_on = false;
+    int key_frame_interval = 0;
+    int num_temporal_layers = 1;
+
+    void SetStreamState(bool send_stream);
+  };
+
+ public:
+  explicit H264EncoderImpl(const cricket::VideoCodec& codec);
+  ~H264EncoderImpl() override;
+
+  // `settings.max_payload_size` is ignored.
+  // The following members of `codec_settings` are used. The rest are ignored.
+  // - codecType (must be kVideoCodecH264)
+  // - targetBitrate
+  // - maxFramerate
+  // - width
+  // - height
+  int32_t InitEncode(const VideoCodec* codec_settings,
+                     const VideoEncoder::Settings& settings) override;
+  int32_t Release() override;
+
+  int32_t RegisterEncodeCompleteCallback(
+      EncodedImageCallback* callback) override;
+  void SetRates(const RateControlParameters& parameters) override;
+
+  // The result of encoding - an EncodedImage and CodecSpecificInfo - are
+  // passed to the encode complete callback.
+  int32_t Encode(const VideoFrame& frame,
+                 const std::vector<VideoFrameType>* frame_types) override;
+
+  EncoderInfo GetEncoderInfo() const override;
+
+  // Exposed for testing.
+  H264PacketizationMode PacketizationModeForTesting() const {
+    return packetization_mode_;
+  }
+
+ private:
+  SEncParamExt CreateEncoderParams(size_t i) const;
+
+  webrtc::H264BitstreamParser h264_bitstream_parser_;
+  // Reports statistics with histograms.
+  void ReportInit();
+  void ReportError();
+
+  std::vector<ISVCEncoder*> encoders_;
+  std::vector<SSourcePicture> pictures_;
+  std::vector<rtc::scoped_refptr<I420Buffer>> downscaled_buffers_;
+  std::vector<LayerConfig> configurations_;
+  std::vector<EncodedImage> encoded_images_;
+  std::vector<std::unique_ptr<ScalableVideoController>> svc_controllers_;
+  absl::InlinedVector<absl::optional<ScalabilityMode>, kMaxSimulcastStreams>
+      scalability_modes_;
+
+  VideoCodec codec_;
+  H264PacketizationMode packetization_mode_;
+  size_t max_payload_size_;
+  int32_t number_of_cores_;
+  absl::optional<int> encoder_thread_limit_;
+  EncodedImageCallback* encoded_image_callback_;
+
+  bool has_reported_init_;
+  bool has_reported_error_;
+
+  std::vector<uint8_t> tl0sync_limit_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_USE_H264
+
+#endif  // MODULES_VIDEO_CODING_CODECS_H264_H264_ENCODER_IMPL_H_