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diff --git a/contrib/llvm-project/clang/include/clang/Analysis/FlowSensitive/Models/ChromiumCheckModel.h b/contrib/llvm-project/clang/include/clang/Analysis/FlowSensitive/Models/ChromiumCheckModel.h
new file mode 100644
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+++ b/contrib/llvm-project/clang/include/clang/Analysis/FlowSensitive/Models/ChromiumCheckModel.h
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+//===-- ChromiumCheckModel.h ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a dataflow model for Chromium's family of CHECK functions.
+//
+//===----------------------------------------------------------------------===//
+#ifndef CLANG_ANALYSIS_FLOWSENSITIVE_MODELS_CHROMIUMCHECKMODEL_H
+#define CLANG_ANALYSIS_FLOWSENSITIVE_MODELS_CHROMIUMCHECKMODEL_H
+
+#include "clang/AST/DeclCXX.h"
+#include "clang/Analysis/FlowSensitive/DataflowAnalysis.h"
+#include "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
+#include "llvm/ADT/DenseSet.h"
+
+namespace clang {
+namespace dataflow {
+
+/// Models the behavior of Chromium's CHECK, DCHECK, etc. macros, so that code
+/// after a call to `*CHECK` can rely on the condition being true.
+class ChromiumCheckModel : public DataflowModel {
+public:
+  ChromiumCheckModel() = default;
+  bool transfer(const CFGElement &Element, Environment &Env) override;
+
+private:
+  /// Declarations for `::logging::CheckError::.*Check`, lazily initialized.
+  llvm::SmallDenseSet<const CXXMethodDecl *> CheckDecls;
+};
+
+} // namespace dataflow
+} // namespace clang
+
+#endif // CLANG_ANALYSIS_FLOWSENSITIVE_MODELS_CHROMIUMCHECKMODEL_H