Run bots/editor.py commands in xvfb-run to make ensure a valid DISPLAY

tools/bots/editor.py

 #!/usr/bin/python
 # Copyright (c) 2013, 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.
 
 import os
 import re
 import shutil
 import sys
 import tempfile
@@ skipping 46 matching lines @@
                               'DartEditor')
   elif sys.platform == 'win32':
     executable = 'DartEditor.exe'
   elif sys.platform == 'linux2':
     executable = 'DartEditor'
   else:
     raise Exception('Unknown platform %s' % sys.platform)
   return os.path.join(editor_dir, executable)
 
 def RunProcess(args):
+  if sys.platform == 'linux':
+    args = ['xvfb-run', '-a'] + args
   print 'Running: %s' % (' '.join(args))
   sys.stdout.flush()
   bot.RunProcess(args)
 
 def DownloadDartium(temp_dir, zip_file):
   """Returns the filename of the unpacked archive"""
   local_path = os.path.join(temp_dir, zip_file)
   uri = "%s/%s" % (GCS_DARTIUM_BUCKET, zip_file)
   RunProcess([GSUTIL, 'cp', uri, local_path])
   RunProcess(['unzip', local_path, '-d', temp_dir])
@@ skipping 68 matching lines @@
       else:
         print ("We currently don't build installers for sys.platform=%s"
                 % sys.platform)
   return 0
 
 if __name__ == '__main__':
   try:
     sys.exit(main())
   except OSError as e:
     sys.exit(e.errno)