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diff --git a/media/libjxl/src/lib/extras/enc/jpg.h b/media/libjxl/src/lib/extras/enc/jpg.h
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+++ b/media/libjxl/src/lib/extras/enc/jpg.h
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+// Copyright (c) the JPEG XL 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.
+
+#ifndef LIB_EXTRAS_ENC_JPG_H_
+#define LIB_EXTRAS_ENC_JPG_H_
+
+// Encodes JPG pixels and metadata in memory.
+
+#include <stdint.h>
+
+#include "lib/extras/codec.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/padded_bytes.h"
+#include "lib/jxl/base/span.h"
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/codec_in_out.h"
+
+namespace jxl {
+namespace extras {
+
+enum class JpegEncoder {
+  kLibJpeg,
+  kSJpeg,
+};
+
+// Encodes into `bytes`.
+Status EncodeImageJPG(const CodecInOut* io, JpegEncoder encoder, size_t quality,
+                      YCbCrChromaSubsampling chroma_subsampling,
+                      ThreadPool* pool, PaddedBytes* bytes);
+
+}  // namespace extras
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_ENC_JPG_H_