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diff --git a/third_party/libwebrtc/test/configurable_frame_size_encoder.h b/third_party/libwebrtc/test/configurable_frame_size_encoder.h
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+/*
+ *  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 TEST_CONFIGURABLE_FRAME_SIZE_ENCODER_H_
+#define TEST_CONFIGURABLE_FRAME_SIZE_ENCODER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <functional>
+#include <memory>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/video/video_bitrate_allocation.h"
+#include "api/video/video_frame.h"
+#include "api/video_codecs/video_codec.h"
+#include "api/video_codecs/video_encoder.h"
+#include "modules/video_coding/include/video_codec_interface.h"
+
+namespace webrtc {
+namespace test {
+
+class ConfigurableFrameSizeEncoder : public VideoEncoder {
+ public:
+  explicit ConfigurableFrameSizeEncoder(size_t max_frame_size);
+  ~ConfigurableFrameSizeEncoder() override;
+
+  void SetFecControllerOverride(
+      FecControllerOverride* fec_controller_override) override;
+
+  int32_t InitEncode(const VideoCodec* codec_settings,
+                     const Settings& settings) override;
+
+  int32_t Encode(const VideoFrame& input_image,
+                 const std::vector<VideoFrameType>* frame_types) override;
+
+  int32_t RegisterEncodeCompleteCallback(
+      EncodedImageCallback* callback) override;
+
+  int32_t Release() override;
+
+  void SetRates(const RateControlParameters& parameters) override;
+
+  EncoderInfo GetEncoderInfo() const override;
+
+  int32_t SetFrameSize(size_t size);
+
+  void SetCodecType(VideoCodecType codec_type_);
+
+  void RegisterPostEncodeCallback(
+      std::function<void(void)> post_encode_callback);
+
+ private:
+  EncodedImageCallback* callback_;
+  absl::optional<std::function<void(void)>> post_encode_callback_;
+
+  size_t current_frame_size_;
+  VideoCodecType codec_type_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_CONFIGURABLE_FRAME_SIZE_ENCODER_H_