Add blink drover revert support.

drover.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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 datetime
 import optparse
 import os
 import re
 import string
@@ skipping 472 matching lines @@
     return default
   return answer
 
 
 def drover(options, args):
   revision = options.revert or options.merge
 
   # Initialize some variables used below. They can be overwritten by
   # the drover.properties file.
   BASE_URL = "svn://svn.chromium.org/chrome"
-  REVERT_ALT_URLS = ['svn://svn.chromium.org/chrome-internal',
+  REVERT_ALT_URLS = ['svn://svn.chromium.org/blink',
+                     'svn://svn.chromium.org/chrome-internal',
                      'svn://svn.chromium.org/native_client']
   TRUNK_URL = BASE_URL + "/trunk/src"
   BRANCH_URL = BASE_URL + "/branches/$branch/src"
   SKIP_CHECK_WORKING = True
   PROMPT_FOR_AUTHOR = False
 
   # Translate a given milestone to the appropriate branch number.
   if options.milestone:
     options.branch = getBranchForMilestone(options.milestone)
     if not options.branch:
@@ skipping 208 matching lines @@
 
   if options.branch and options.milestone:
     option_parser.error("--branch cannot be used with --milestone")
     return 1
 
   return drover(options, args)
 
 
 if __name__ == "__main__":
   sys.exit(main())