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diff --git a/third_party/jpeg-xl/lib/jxl/enc_aux_out.h b/third_party/jpeg-xl/lib/jxl/enc_aux_out.h
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+++ b/third_party/jpeg-xl/lib/jxl/enc_aux_out.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_JXL_AUX_OUT_H_
+#define LIB_JXL_AUX_OUT_H_
+
+// Optional output information for debugging and analyzing size usage.
+
+#include <stddef.h>
+
+#include <array>
+#include <functional>
+#include <string>
+
+namespace jxl {
+
+struct ColorEncoding;
+
+// For LayerName and AuxOut::layers[] index. Order does not matter.
+enum {
+  kLayerHeader = 0,
+  kLayerTOC,
+  kLayerDictionary,
+  kLayerSplines,
+  kLayerNoise,
+  kLayerQuant,
+  kLayerModularTree,
+  kLayerModularGlobal,
+  kLayerDC,
+  kLayerModularDcGroup,
+  kLayerControlFields,
+  kLayerOrder,
+  kLayerAC,
+  kLayerACTokens,
+  kLayerModularAcGroup,
+  kNumImageLayers
+};
+
+const char* LayerName(size_t layer);
+
+// Statistics gathered during compression or decompression.
+struct AuxOut {
+ private:
+  struct LayerTotals {
+    void Assimilate(const LayerTotals& victim) {
+      num_clustered_histograms += victim.num_clustered_histograms;
+      histogram_bits += victim.histogram_bits;
+      extra_bits += victim.extra_bits;
+      total_bits += victim.total_bits;
+      clustered_entropy += victim.clustered_entropy;
+    }
+    void Print(size_t num_inputs) const;
+
+    size_t num_clustered_histograms = 0;
+    size_t extra_bits = 0;
+
+    // Set via BitsWritten below
+    size_t histogram_bits = 0;
+    size_t total_bits = 0;
+
+    double clustered_entropy = 0.0;
+  };
+
+ public:
+  AuxOut() = default;
+  AuxOut(const AuxOut&) = default;
+
+  void Assimilate(const AuxOut& victim);
+
+  void Print(size_t num_inputs) const;
+
+  size_t TotalBits() const {
+    size_t total = 0;
+    for (const auto& layer : layers) {
+      total += layer.total_bits;
+    }
+    return total;
+  }
+
+  std::array<LayerTotals, kNumImageLayers> layers;
+  size_t num_blocks = 0;
+
+  // Number of blocks that use larger DCT (set by ac_strategy).
+  size_t num_small_blocks = 0;
+  size_t num_dct4x8_blocks = 0;
+  size_t num_afv_blocks = 0;
+  size_t num_dct8_blocks = 0;
+  size_t num_dct8x16_blocks = 0;
+  size_t num_dct8x32_blocks = 0;
+  size_t num_dct16_blocks = 0;
+  size_t num_dct16x32_blocks = 0;
+  size_t num_dct32_blocks = 0;
+  size_t num_dct32x64_blocks = 0;
+  size_t num_dct64_blocks = 0;
+
+  int num_butteraugli_iters = 0;
+};
+}  // namespace jxl
+
+#endif  // LIB_JXL_AUX_OUT_H_