Add support for GetHomeDir for Mac and Windows.

base/file_util.h

 // 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
@@ skipping 203 matching lines @@
 
 // Get a temporary directory for shared memory files. The directory may depend
 // on whether the destination is intended for executable files, which in turn
 // depends on how /dev/shmem was mounted. As a result, you must supply whether
 // you intend to create executable shmem segments so this function can find
 // an appropriate location.
 //
 // Only useful on POSIX; redirects to GetTempDir() on Windows.
 BASE_EXPORT bool GetShmemTempDir(bool executable, FilePath* path);
 
-#if defined(OS_POSIX)
-// Get the home directory.  This is more complicated than just getenv("HOME")
+// Get the home directory. This is more complicated than just getenv("HOME")
 // as it knows to fall back on getpwent() etc.
 //
-// This function is not currently implemented on Windows or Mac because we
-// don't use it. Generally you would use one of PathService's APP_DATA
-// directories on those platforms. If we need it, this could be implemented
-// there to return the appropriate directory.
+// You should not generally call this directly. Instead use DIR_HOME with the
+// path service which will use this function but cache the value.
 BASE_EXPORT FilePath GetHomeDir();
-#endif  // OS_POSIX
 
 // Creates a temporary file. The full path is placed in |path|, and the
 // function returns true if was successful in creating the file. The file will
 // be empty and all handles closed after this function returns.
 BASE_EXPORT bool CreateTemporaryFile(FilePath* path);
 
 // Same as CreateTemporaryFile but the file is created in |dir|.
 BASE_EXPORT bool CreateTemporaryFileInDir(const FilePath& dir,
                                           FilePath* temp_file);
 
@@ skipping 234 matching lines @@
 // This function simulates Move(), but unlike Move() it works across volumes.
 // This function is not transactional.
 BASE_EXPORT bool CopyAndDeleteDirectory(const FilePath& from_path,
                                         const FilePath& to_path);
 #endif  // defined(OS_WIN)
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_FILE_UTIL_H_