Make changes to support bisect for android-chrome.

tools/auto_bisect/bisect_utils.py

 # Copyright 2014 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.
 
 """Utility functions used by the bisect tool.
 
 This includes functions related to checking out the depot and outputting
 annotations for the Buildbot waterfall.
 """
 
@@ skipping 315 matching lines @@
   """Cleans up any leftover index.lock files after running git."""
   # If a previous run of git crashed, or bot was reset, etc., then we might
   # end up with leftover index.lock files.
   for path, _, files in os.walk(cwd):
     for cur_file in files:
       if cur_file.endswith('index.lock'):
         path_to_file = os.path.join(path, cur_file)
         os.remove(path_to_file)
 
 
-def RunGClientAndSync(cwd=None):
+def RunGClientAndSync(revision=None, cwd=None):
   """Runs gclient and does a normal sync.
 
   Args:
+    revision: Revision that need to be synced.
     cwd: Working directory to run from.
 
   Returns:
     The return code of the call.
   """
-  params = ['sync', '--verbose', '--nohooks', '--reset', '--force',
+  params = ['sync', '--verbose', '--nohooks', '--force',
             '--delete_unversioned_trees']
+  if revision:
+    params.extend(['--revision', revision])
   return RunGClient(params, cwd=cwd)
 
 
 def SetupGitDepot(opts, custom_deps):
   """Sets up the depot for the bisection.
 
   The depot will be located in a subdirectory called 'bisect'.
 
   Args:
     opts: The options parsed from the command line through parse_args().
@@ skipping 166 matching lines @@
     platform = os.environ.get('PROCESSOR_ARCHITECTURE')
   return platform and platform in ['AMD64', 'I64']
 
 
 def IsLinuxHost():
   return sys.platform.startswith('linux')
 
 
 def IsMacHost():
   return sys.platform.startswith('darwin')