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diff --git a/base/i18n/file_util_icu.h b/base/i18n/file_util_icu.h
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+++ b/base/i18n/file_util_icu.h
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+// Copyright (c) 2012 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.
+
+#ifndef BASE_I18N_FILE_UTIL_ICU_H_
+#define BASE_I18N_FILE_UTIL_ICU_H_
+
+// File utilities that use the ICU library go in this file.
+
+#include "base/files/file_path.h"
+#include "base/i18n/base_i18n_export.h"
+#include "base/strings/string16.h"
+
+namespace base {
+namespace i18n {
+
+// Returns true if file_name does not have any illegal character. The input
+// param has the same restriction as that for ReplaceIllegalCharacters.
+BASE_I18N_EXPORT bool IsFilenameLegal(const string16& file_name);
+
+// Replaces characters in |file_name| that are illegal for file names with
+// |replace_char|. |file_name| must not be a full or relative path, but just the
+// file name component (since slashes are considered illegal). Any leading or
+// trailing whitespace or periods in |file_name| is also replaced with the
+// |replace_char|.
+//
+// Example:
+//   "bad:file*name?.txt" will be turned into "bad_file_name_.txt" when
+//   |replace_char| is '_'.
+//
+// Warning: Do not use this function as the sole means of sanitizing a filename.
+//   While the resulting filename itself would be legal, it doesn't necessarily
+//   mean that the file will behave safely. On Windows, certain reserved names
+//   refer to devices rather than files (E.g. LPT1), and some filenames could be
+//   interpreted as shell namespace extensions (E.g. Foo.{<GUID>}).
+//
+// On Windows, Chrome OS and Mac, the file system encoding is already known and
+// parsed as UTF-8 and UTF-16 accordingly.
+// On Linux, the file name will be parsed as UTF8.
+// TODO(asanka): Move full filename sanitization logic here.
+BASE_I18N_EXPORT void ReplaceIllegalCharactersInPath(
+    FilePath::StringType* file_name,
+    char replace_char);
+
+// Compares two filenames using the current locale information. This can be
+// used to sort directory listings. It behaves like "operator<" for use in
+// std::sort.
+BASE_I18N_EXPORT bool LocaleAwareCompareFilenames(const FilePath& a,
+                                                  const FilePath& b);
+
+// Calculates the canonical file-system representation of |file_name| base name.
+// Modifies |file_name| in place. No-op if not on ChromeOS.
+BASE_I18N_EXPORT void NormalizeFileNameEncoding(FilePath* file_name);
+
+}  // namespace i18n
+}  // namespace base
+
+#endif  // BASE_I18N_FILE_UTIL_ICU_H_