Automatically determine current V8 sheriff in chromium-roll script.

tools/push-to-trunk/auto_roll.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project 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 argparse
 import json
 import os
 import sys
 import urllib
@@ skipping 52 matching lines @@
       print("There is no newer v8 revision than the one in Chromium (%s)."
             % last_roll)
       return True
 
 
 class RollChromium(Step):
   MESSAGE = "Roll V8 into Chromium."
 
   def RunStep(self):
     if self._options.roll:
+      args = [
+        "--author", self._options.author,
+        "--reviewer", self._options.reviewer,
+        "--chromium", self._options.chromium,
+        "--force",
+      ]
+      if self._options.sheriff:
+        args.extend([
+            "--sheriff", "--googlers-mapping", self._options.googlers_mapping])
       R = chromium_roll.ChromiumRoll
       self._side_effect_handler.Call(
           R(chromium_roll.CONFIG, self._side_effect_handler).Run,
-          ["--author", self._options.author,
-           "--reviewer", self._options.reviewer,
-           "--chromium", self._options.chromium,
-           "--force"])
+          args)
 
 
 class AutoRoll(ScriptsBase):
   def _PrepareOptions(self, parser):
-    group = parser.add_mutually_exclusive_group()
     parser.add_argument("-c", "--chromium", required=True,
                         help=("The path to your Chromium src/ "
                               "directory to automate the V8 roll."))
     parser.add_argument("--roll",
                         help="Make Chromium roll. Dry run if unspecified.",
                         default=False, action="store_true")
 
   def _ProcessOptions(self, options):  # pragma: no cover
     if not options.reviewer:
       print "A reviewer (-r) is required."
       return False
     if not options.author:
       print "An author (-a) is required."
       return False
     return True
 
   def _Steps(self):
     return [
       CheckActiveRoll,
       DetectLastPush,
       DetectLastRoll,
       RollChromium,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(AutoRoll(CONFIG).Run())