Add exists, create and delete to directory implementation on Linux and Mac.

runtime/bin/bin.gypi

 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 {
   'variables': {
     'builtin_in_cc_file': 'builtin_in.cc',
     'builtin_cc_file': '<(SHARED_INTERMEDIATE_DIR)/builtin_gen.cc',
     'snapshot_in_cc_file': 'snapshot_in.cc',
     'snapshot_bin_file': '<(SHARED_INTERMEDIATE_DIR)/snapshot_gen.bin',
@@ skipping 56 matching lines @@
       'include_dirs': [
         '..',
       ],
       'sources': [
         'builtin.cc',
         'builtin.h',
         'dartutils.h',
         'dartutils.cc',
         'directory.h',
         'directory.cc',
-        'directory_linux.cc',
-        'directory_macos.cc',
+        'directory_posix.cc',
         'directory_win.cc',
         'eventhandler.cc',
         'eventhandler.h',
         'eventhandler_linux.cc',
         'eventhandler_linux.h',
         'eventhandler_macos.cc',
         'eventhandler_macos.h',
         'eventhandler_win.cc',
         'eventhandler_win.h',
         'file.cc',
@@ skipping 215 matching lines @@
       'include_dirs': [
         '..',
         '<(SHARED_INTERMEDIATE_DIR)',
       ],
       'sources': [
         'run_vm_tests.cc',
         'dartutils.h',
         'dartutils.cc',
         'directory.h',
         'directory.cc',
-        'directory_linux.cc',
-        'directory_macos.cc',
+        'directory_posix.cc',
         'directory_win.cc',
         'eventhandler.cc',
         'eventhandler.h',
         'eventhandler_linux.cc',
         'eventhandler_linux.h',
         'eventhandler_macos.cc',
         'eventhandler_macos.h',
         'eventhandler_win.cc',
         'eventhandler_win.h',
         'file.cc',
@@ skipping 40 matching lines @@
         ['include', 'file.h'],
         ['include', 'file_test.cc'],
         ['include', 'process.cc'],
         ['include', 'process.h'],
         ['include', 'socket.cc'],
         ['include', 'socket.h'],
         ['include', 'set_test.cc'],
       ],
       'conditions': [
         ['OS=="linux"', {'sources/' : [
-          ['include', 'directory_linux.cc'],
+          ['include', 'directory_posix.cc'],
           ['include', 'eventhandler_linux.cc'],
           ['include', 'eventhandler_linux.h'],
           ['include', 'fdutils.h'],
           ['include', 'fdutils_linux.cc'],
           ['include', 'file_linux.cc'],
           ['include', 'process_linux.cc'],
           ['include', 'socket_linux.cc'],
         ]}],
         ['OS=="mac"', {'sources/' : [
-          ['include', 'directory_macos.cc'],
+          ['include', 'directory_posix.cc'],
           ['include', 'eventhandler_macos.cc'],
           ['include', 'eventhandler_macos.h'],
           ['include', 'fdutils.h'],
           ['include', 'fdutils_macos.cc'],
           ['include', 'file_macos.cc'],
           ['include', 'process_macos.cc'],
           ['include', 'socket_macos.cc'],
         ]}],
         ['OS=="win"', {'sources/' : [
           ['include', 'directory_win.cc'],
           ['include', 'eventhandler_win.cc'],
           ['include', 'eventhandler_win.h'],
           ['include', 'file_win.cc'],
           ['include', 'process_win.cc'],
           ['include', 'socket_win.cc'],
         ]}],
         ['OS=="win"', {
           'link_settings': {
             'libraries': [ '-lws2_32.lib' ],
           },
         }],
       ],
     },
   ],
 }