Add DIR_ANDROID_EXTERNAL_STORAGE to base/base_path.h

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 24 matching lines @@
                     // for tests that need to locate various resources.  It
                     // should not be used outside of test code.
 #if defined(OS_POSIX)
   DIR_CACHE,    // Directory where to put cache data.  Note this is
                 // *not* where the browser cache lives, but the
                 // browser cache can be a subdirectory.
                 // This is $XDG_CACHE_HOME on Linux and
                 // ~/Library/Caches on Mac.
   DIR_HOME,     // $HOME on POSIX-like systems.
 #endif
+#if defined(OS_ANDROID)
+  DIR_ANDROID_EXTERNAL_STORAGE,  // Android external storage directory.
+#endif
 
   PATH_END
 };
 
 }  // namespace base
 
 #endif  // BASE_BASE_PATHS_H_