Add support for GetHomeDir for Mac and Windows.

base/base_paths.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.
 
 #ifndef BASE_BASE_PATHS_H_
 #define BASE_BASE_PATHS_H_
 
 // This file declares path keys for the base module.  These can be used with
 // the PathService to access various special directories and files.
 
@@ skipping 13 matching lines @@
 
 namespace base {
 
 enum BasePathKey {
   PATH_START = 0,
 
   DIR_CURRENT,       // Current directory.
   DIR_EXE,           // Directory containing FILE_EXE.
   DIR_MODULE,        // Directory containing FILE_MODULE.
   DIR_TEMP,          // Temporary directory.
+  DIR_HOME,          // User's root home directory. On Windows this will look
+                     // like "C:\Users\you" (or on XP
+                     // "C:\Document and Settings\you") which isn't necessarily
+                     // a great place to put files.
   FILE_EXE,          // Path and filename of the current executable.
   FILE_MODULE,       // Path and filename of the module containing the code for
                      // the PathService (which could differ from FILE_EXE if the
                      // PathService were compiled into a shared object, for
                      // example).
   DIR_SOURCE_ROOT,   // Returns the root of the source tree. This key is useful
                      // for tests that need to locate various resources. It
                      // should not be used outside of test code.
   DIR_USER_DESKTOP,  // The current user's Desktop.
 
   DIR_TEST_DATA,     // Used only for testing.
 
   PATH_END
 };
 
 }  // namespace base
 
 #endif  // BASE_BASE_PATHS_H_