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diff --git a/third_party/jpeg-xl/lib/jxl/fast_dct.h b/third_party/jpeg-xl/lib/jxl/fast_dct.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.
+
+namespace jxl {
+void BenchmarkFloatIDCT32x32();
+void BenchmarkFastIDCT32x32();
+} // namespace jxl