First pass android support in bisect script.

tools/prepare-bisect-perf-regression.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.
 
 """Prepare Performance Test Bisect Tool
 
 This script is used by a trybot to create a working directory and sync an
 initial copy of the depot for use in bisecting performance regressions.
 
@@ skipping 23 matching lines @@
   parser.add_option('-w', '--working_directory',
                     type='str',
                     help='Path to the working directory where the script will '
                     'do an initial checkout of the chromium depot. The '
                     'files will be placed in a subdirectory "bisect" under '
                     'working_directory and that will be used to perform the '
                     'bisection.')
   parser.add_option('--output_buildbot_annotations',
                     action="store_true",
                     help='Add extra annotation output for buildbot.')
+  parser.add_option('--target_platform',
+                    type='choice',
+                    choices=['chromium', 'cros', 'android'],
+                    default='chromium',
+                    help='The target platform. Choices are "chromium" (current '
+                    'platform), "cros", or "android". If you specify something '
+                    'other than "chromium", you must be properly set up to '
+                    'build that platform.')
   (opts, args) = parser.parse_args()
 
   if not opts.working_directory:
     print 'Error: missing required parameter: --working_directory'
     print
     parser.print_help()
     return 1
 
   return bisect_utils.CreateBisectDirectoryAndSetupDepot(opts, True)
 
 
 if __name__ == '__main__':
   sys.exit(main())