Failing layout tests on Android shouldn't fail the whole bot.

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 222 matching lines @@
 
   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_files', []):
     cmd_args.extend(
         ['--additional-expectations=%s' % os.path.join(CHROME_SRC, *f)])
 
-  RunCmd(['webkit/tools/layout_tests/run_webkit_tests.py'] + cmd_args)
+  RunCmd(['webkit/tools/layout_tests/run_webkit_tests.py'] + cmd_args,
+         flunk_on_failure=False)
 
 
 def MainTestWrapper(options):
   # Restart adb to work around bugs, sleep to wait for usb discovery.
   RunCmd(['adb', 'kill-server'])
   RunCmd(['adb', 'start-server'])
   RunCmd(['sleep', '1'])
 
   # Spawn logcat monitor
   logcat_dir = os.path.join(CHROME_SRC, 'out/logcat')
@@ skipping 99 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))