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diff --git a/media/libjxl/src/lib/jxl/enc_huffman.h b/media/libjxl/src/lib/jxl/enc_huffman.h
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+++ b/media/libjxl/src/lib/jxl/enc_huffman.h
@@ -0,0 +1,22 @@
+// 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_JXL_ENC_HUFFMAN_H_
+#define LIB_JXL_ENC_HUFFMAN_H_
+
+#include "lib/jxl/enc_bit_writer.h"
+
+namespace jxl {
+
+// Builds a Huffman tree for the given histogram, and encodes it into writer
+// in a format that can be read by HuffmanDecodingData::ReadFromBitstream.
+// An allotment for `writer` must already have been created by the caller.
+void BuildAndStoreHuffmanTree(const uint32_t* histogram, size_t length,
+                              uint8_t* depth, uint16_t* bits,
+                              BitWriter* writer);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_ENC_HUFFMAN_H_