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diff --git a/third_party/jpeg-xl/lib/jxl/passes_state.h b/third_party/jpeg-xl/lib/jxl/passes_state.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_PASSES_STATE_H_
+#define LIB_JXL_PASSES_STATE_H_
+
+#include "lib/jxl/ac_context.h"
+#include "lib/jxl/ac_strategy.h"
+#include "lib/jxl/chroma_from_luma.h"
+#include "lib/jxl/dec_patch_dictionary.h"
+#include "lib/jxl/frame_header.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/image_bundle.h"
+#include "lib/jxl/loop_filter.h"
+#include "lib/jxl/noise.h"
+#include "lib/jxl/quant_weights.h"
+#include "lib/jxl/quantizer.h"
+#include "lib/jxl/splines.h"
+
+// Structures that hold the (en/de)coder state for a JPEG XL kVarDCT
+// (en/de)coder.
+
+namespace jxl {
+
+struct ImageFeatures {
+  NoiseParams noise_params;
+  PatchDictionary patches;
+  Splines splines;
+};
+
+// State common to both encoder and decoder.
+// NOLINTNEXTLINE(clang-analyzer-optin.performance.Padding)
+struct PassesSharedState {
+  const CodecMetadata* metadata;
+
+  FrameDimensions frame_dim;
+
+  // Control fields and parameters.
+  AcStrategyImage ac_strategy;
+
+  // Dequant matrices + quantizer.
+  DequantMatrices matrices;
+  Quantizer quantizer{&matrices};
+  ImageI raw_quant_field;
+
+  // Per-block side information for EPF detail preservation.
+  ImageB epf_sharpness;
+
+  ColorCorrelationMap cmap;
+
+  ImageFeatures image_features;
+
+  // Memory area for storing coefficient orders.
+  // `coeff_order_size` is the size used by *one* set of coefficient orders (at
+  // most kMaxCoeffOrderSize). A set of coefficient orders is present for each
+  // pass.
+  size_t coeff_order_size = 0;
+  std::vector<coeff_order_t> coeff_orders;
+
+  // Decoder-side DC and quantized DC.
+  ImageB quant_dc;
+  Image3F dc_storage;
+  const Image3F* JXL_RESTRICT dc = &dc_storage;
+
+  BlockCtxMap block_ctx_map;
+
+  Image3F dc_frames[4];
+
+  struct {
+    ImageBundle frame;
+    // ImageBundle doesn't yet have a simple way to state it is in XYB.
+    bool ib_is_in_xyb = false;
+  } reference_frames[4] = {};
+
+  // Number of pre-clustered set of histograms (with the same ctx map), per
+  // pass. Encoded as num_histograms_ - 1.
+  size_t num_histograms = 0;
+};
+
+// Initialized the state information that is shared between encoder and decoder.
+Status InitializePassesSharedState(const FrameHeader& frame_header,
+                                   PassesSharedState* JXL_RESTRICT shared,
+                                   bool encoder = false);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_PASSES_STATE_H_