Add gerrit Change-Id to commit messages if they do not have one.

gclient.py

 #!/usr/bin/env python
 # 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.
 
 """Meta checkout manager supporting both Subversion and GIT.
 
 Files
   .gclient      : Current client configuration, written by 'config' command.
                   Format is a Python script defining 'solutions', a list whose
@@ skipping 437 matching lines @@
       # Eval the content.
       try:
         exec(deps_content, global_scope, local_scope)
       except SyntaxError, e:
         gclient_utils.SyntaxErrorToError(filepath, e)
     deps = local_scope.get('deps', {})
     if 'recursion' in local_scope:
       self.recursion_override = local_scope.get('recursion')
       logging.warning(
           'Setting %s recursion to %d.', self.name, self.recursion_limit)
+    # Check if 'target_os' is present in the DEPS file. If yes, then add OSes
+    # specified to the set of enforced OSes.
+    if 'target_os' in local_scope:
+      self.root._enforced_os = tuple(
+          set(local_scope['target_os']).union(self.root._enforced_os))
     # load os specific dependencies if defined.  these dependencies may
     # override or extend the values defined by the 'deps' member.
     if 'deps_os' in local_scope:
       enforced_os = self.root.enforced_os
       for deps_os_key in enforced_os:
         os_deps = local_scope['deps_os'].get(deps_os_key, {})
         if len(enforced_os) > 1:
           # Ignore any conflict when including deps for more than one
           # platform, so we collect the broadest set of dependencies
           # available. We may end up with the wrong revision of something for
@@ skipping 1175 matching lines @@
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, 'Error: %s' % str(e)
     return 1
 
 
 if '__main__' == __name__:
   fix_encoding.fix_encoding()
   sys.exit(Main(sys.argv[1:]))
 
 # vim: ts=2:sw=2:tw=80:et: