Add ability for cbuildbot to only run unit tests for revved packages.

cros_mark_as_stable.py

 #!/usr/bin/python
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This module uprevs a given package's ebuild to the next revision."""
 
 
 import fileinput
 import gflags
 import os
 import re
 import shutil
 import subprocess
 import sys
 
 sys.path.append(os.path.join(os.path.dirname(__file__), 'lib'))
 from cros_build_lib import Info, RunCommand, Warning, Die
 
 gflags.DEFINE_boolean('all', False,
                       'Mark all packages as stable.')
 gflags.DEFINE_string('board', '',
                      'Board for which the package belongs.', short_name='b')
+gflags.DEFINE_string('drop_file', None,
+                     'File to list packages that were revved.')
 gflags.DEFINE_boolean('dryrun', False,
                      'Passes dry-run to git push if pushing a change.')
 gflags.DEFINE_string('overlays', '',
                      'Colon-separated list of overlays to modify.',
                      short_name='o')
 gflags.DEFINE_string('packages', '',
                      'Colon-separated list of packages to mark as stable.',
                      short_name='p')
 gflags.DEFINE_string('push_options', '',
                      'Options to use with git-cl push using push command.')
@@ skipping 527 matching lines @@
             revved_packages.append(ebuild.package)
 
         except (OSError, IOError):
           Warning('Cannot rev %s\n' % ebuild.package,
                   'Note you will have to go into %s '
                   'and reset the git repo yourself.' % overlay)
           raise
 
       if revved_packages:
         _CleanStalePackages(gflags.FLAGS.board, revved_packages)
+        if gflags.FLAGS.drop_file:
+          fh = open(gflags.FLAGS.drop_file, 'w')
+          fh.write(' '.join(revved_packages))
+          fh.close()
       else:
         work_branch.Delete()
 
 
 if __name__ == '__main__':
   main(sys.argv)