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diff --git a/clang-tools-extra/modularize/PreprocessorTracker.h b/clang-tools-extra/modularize/PreprocessorTracker.h
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+//===- PreprocessorTracker.h - Tracks preprocessor activities -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===--------------------------------------------------------------------===//
+///
+/// \file
+/// \brief Track preprocessor activities for modularize.
+///
+//===--------------------------------------------------------------------===//
+
+#ifndef MODULARIZE_PREPROCESSOR_TRACKER_H
+#define MODULARIZE_PREPROCESSOR_TRACKER_H
+
+#include "clang/Lex/Preprocessor.h"
+
+namespace Modularize {
+
+// Preprocessor tracker for modularize.
+//
+// This class stores information about all the headers processed in the
+// course of running modularize.
+class PreprocessorTracker {
+public:
+  virtual ~PreprocessorTracker();
+
+  // Handle entering a preprocessing session.
+  // (Called after a Preprocessor object is created, but before preprocessing.)
+  virtual void handlePreprocessorEntry(clang::Preprocessor &PP,
+                                       llvm::StringRef RootHeaderFile) = 0;
+  // Handle exiting a preprocessing session.
+  // (Called after preprocessing is complete, but before the Preprocessor
+  // object is destroyed.)
+  virtual void handlePreprocessorExit() = 0;
+
+  // Report on inconsistent macro instances.
+  // Returns true if any mismatches.
+  virtual bool reportInconsistentMacros(llvm::raw_ostream &OS) = 0;
+
+  // Report on inconsistent conditional directive instances.
+  // Returns true if any mismatches.
+  virtual bool reportInconsistentConditionals(llvm::raw_ostream &OS) = 0;
+
+  // Create instance of PreprocessorTracker.
+  static PreprocessorTracker *create();
+};
+
+} // end namespace Modularize
+
+#endif