Add "" as a valid value for --builder_type in bisect_perf_regression.py.

tools/auto_bisect/bisect_perf_regression.py

 #!/usr/bin/env python
 # Copyright 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.
 
 """Chromium auto-bisect tool
 
 This script bisects a range of commits using binary search. It starts by getting
 reference values for the specified "good" and "bad" commits. Then, for revisions
 in between, it will get builds, run tests and classify intermediate revisions as
@@ skipping 2623 matching lines @@
     group.add_argument('--target_arch', default='ia32',
                        dest='target_arch', choices=['ia32', 'x64', 'arm'],
                        help='The target build architecture. Choices are "ia32" '
                             '(default), "x64" or "arm".')
     group.add_argument('--target_build_type', default='Release',
                        choices=['Release', 'Debug'],
                        help='The target build type. Choices are "Release" '
                             '(default), or "Debug".')
     group.add_argument('--builder_type', default=fetch_build.PERF_BUILDER,
                        choices=[fetch_build.PERF_BUILDER,
-                                fetch_build.FULL_BUILDER],
+                                fetch_build.FULL_BUILDER, ''],
                        help='Type of builder to get build from. This '
                             'determines both the bot that builds and the '
-                            'place where archived builds are downloaded from.')
+                            'place where archived builds are downloaded from. '
+                            'For local builds, an empty string can be passed.')
 
   @staticmethod
   def _AddDebugOptionsGroup(parser):
     group = parser.add_argument_group('Debug options')
     group.add_argument('--debug_ignore_build', action='store_true',
                        help='DEBUG: Don\'t perform builds.')
     group.add_argument('--debug_ignore_sync', action='store_true',
                        help='DEBUG: Don\'t perform syncs.')
     group.add_argument('--debug_ignore_perf_test', action='store_true',
                        help='DEBUG: Don\'t perform performance tests.')
@@ skipping 158 matching lines @@
       # bugs. If you change this, please update the perf dashboard as well.
       bisect_utils.OutputAnnotationStepStart('Results')
     print 'Runtime Error: %s' % e
     if opts.output_buildbot_annotations:
       bisect_utils.OutputAnnotationStepClosed()
   return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())