Clean up out/<target> directory in the end if extract_build.

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 hashlib
 import json
 import os
@@ skipping 641 matching lines @@
 
   finally:
     # Run all post test steps
     LogcatDump(options)
     if not options.disable_stack_tool:
       RunStackToolSteps(options)
     GenerateTestReport(options)
     # KillHostHeartbeat() has logic to check if heartbeat process is running,
     # and kills only if it finds the process is running on the host.
     provision_devices.KillHostHeartbeat()
+    if options.cleanup:
+      shutil.rmtree(os.path.join(CHROME_OUT_DIR, options.target),
+          ignore_errors=True)
 
 
 def GetDeviceStepsOptParser():
   parser = bb_utils.GetParser()
   parser.add_option('--experimental', action='store_true',
                     help='Run experiemental tests')
   parser.add_option('-f', '--test-filter', metavar='<filter>', default=[],
                     action='append',
                     help=('Run a test suite. Test suites: "%s"' %
                           '", "'.join(VALID_TESTS)))
@@ skipping 25 matching lines @@
   # which builds are produced. Therefore we should look for relevent output
   # file under this directory.(/b/build/slave/<slave_name>/build/bisect/src/out)
   parser.add_option(
       '--chrome-output-dir',
       help='Chrome output directory to be used while bisecting.')
 
   parser.add_option('--disable-stack-tool',  action='store_true',
       help='Do not run stack tool.')
   parser.add_option('--asan-symbolize',  action='store_true',
       help='Run stack tool for ASAN')
+  parser.add_option('--cleanup', action='store_true',
+      help='Delete out/<target> directory at the end of the run.')
   return parser
 
 
 def main(argv):
   parser = GetDeviceStepsOptParser()
   options, args = parser.parse_args(argv[1:])
 
   if args:
     return sys.exit('Unused args %s' % args)
 
@@ skipping 11 matching lines @@
 
   if options.coverage_bucket:
     setattr(options, 'coverage_dir',
             os.path.join(CHROME_OUT_DIR, options.target, 'coverage'))
 
   MainTestWrapper(options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))