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diff --git a/base/stringize_macros.h b/base/stringize_macros.h
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+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// This file defines preprocessor macros for stringizing preprocessor
+// symbols (or their output) and manipulating preprocessor symbols
+// that define strings.
+
+#ifndef BASE_STRINGIZE_MACROS_H_
+#define BASE_STRINGIZE_MACROS_H_
+#pragma once
+
+#include "build/build_config.h"
+
+// This is not very useful as it does not expand defined symbols if
+// called directly. Use its counterpart without the _NO_EXPANSION
+// suffix, below.
+#define STRINGIZE_NO_EXPANSION(x) #x
+
+// Use this to quote the provided parameter, first expanding it if it
+// is a preprocessor symbol.
+//
+// For example, if:
+//   #define A FOO
+//   #define B(x) myobj->FunctionCall(x)
+//
+// Then:
+//   STRINGIZE(A) produces "FOO"
+//   STRINGIZE(B(y)) produces "myobj->FunctionCall(y)"
+#define STRINGIZE(x) STRINGIZE_NO_EXPANSION(x)
+
+// The following are defined only on Windows (for use when interacting
+// with Windows APIs) as wide strings are otherwise deprecated.
+#if defined(OS_WIN)
+
+// Second-level utility macros to let us expand symbols.
+#define LSTRINGIZE_NO_EXPANSION(x) L ## #x
+#define TO_L_STRING_NO_EXPANSION(x) L ## x
+
+// L version of STRINGIZE(). For examples above,
+//   LSTRINGIZE(A) produces L"FOO"
+//   LSTRINGIZE(B(y)) produces L"myobj->FunctionCall(y)"
+#define LSTRINGIZE(x) LSTRINGIZE_NO_EXPANSION(x)
+
+// Adds an L in front of an existing ASCII string constant (after
+// expanding symbols). Does not do any quoting.
+//
+// For example, if:
+//   #define C "foo"
+//
+// Then:
+//   TO_L_STRING(C) produces L"foo"
+#define TO_L_STRING(x) TO_L_STRING_NO_EXPANSION(x)
+
+#endif  // defined(OS_WIN)
+
+#endif  // BASE_STRINGIZE_MACROS_H_