Add fetch recipe targeting iOS

recipes/chromium.py

 # Copyright (c) 2013 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.
 
 import sys
 
 import recipe_util  # pylint: disable=F0401
 
 
 # This class doesn't need an __init__ method, so we disable the warning
@@ skipping 16 matching lines @@
     spec = {
       'solutions': [solution],
       'svn_url': 'svn://svn.chromium.org/chrome',
       'svn_branch': 'trunk/src',
       'svn_ref': 'git-svn',
     }
     if props.get('submodule_git_svn_spec'):
       spec['submodule_git_svn_spec'] = props['submodule_git_svn_spec']
     if props.get('target_os'):
       spec['target_os'] = props['target_os'].split(',')
+    if props.get('target_os_only'):
+      spec['target_os_only'] = props['target_os_only']
     checkout_type = 'gclient_git_svn'
     if props.get('nosvn'):
       checkout_type = 'gclient_git'
     spec_type = '%s_spec' % checkout_type
     return {
       'type': checkout_type,
       spec_type: spec,
     }
 
   @staticmethod
   def expected_root(_props):
     return 'src'
 
 
 def main(argv=None):
   return Chromium().handle_args(argv)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))