Fix WebKit Android buildbot script.

build/android/buildbot/bb_device_steps.py

 #!/usr/bin/env python
 # 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 collections
 import glob
 import json
 import multiprocessing
 import optparse
@@ skipping 218 matching lines @@
         '--no-show-results',
         '--no-new-test-results',
         '--full-results-html',
         '--clobber-old-results',
         '--exit-after-n-failures', '5000',
         '--exit-after-n-crashes-or-timeouts', '100',
         '--debug-rwt-logging',
         '--results-directory', '..layout-test-results',
         '--target', options.target,
         '--builder-name', options.build_properties.get('buildername', ''),
-        '--build-number', options.build_properties.get('buildnumber', ''),
+        '--build-number', str(options.build_properties.get('buildnumber', '')),
         '--master-name', options.build_properties.get('mastername', ''),
         '--build-name', options.build_properties.get('buildername', ''),
         '--platform=chromium-android']
 
   for flag in 'test_results_server', 'driver_name', 'additional_drt_flag':
     if flag in options.factory_properties:
       cmd_args.extend(['--%s' % flag.replace('_', '-'),
                        options.factory_properties.get(flag)])
 
   for f in options.factory_properties.get('additional_expectations', []):
@@ skipping 130 matching lines @@
       'slave', 'android'))
   if os.path.exists(build_internal_android):
     android_paths.insert(0, build_internal_android)
   os.environ['PATH'] = os.pathsep.join(android_paths + [os.environ['PATH']])
 
   MainTestWrapper(options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))