Make changes to support bisect for android-chrome.

tools/auto_bisect/bisect_utils.py

Index: tools/auto_bisect/bisect_utils.py
diff --git a/tools/auto_bisect/bisect_utils.py b/tools/auto_bisect/bisect_utils.py
index 874dbcbfa3f03a276341efe5fafc3690461d24ac..5f80d4543c3e1ab4d5481f9953a28fd342bccdcf 100644
--- a/tools/auto_bisect/bisect_utils.py
+++ b/tools/auto_bisect/bisect_utils.py
@@ -333,17 +333,20 @@ def _CleanupPreviousGitRuns(cwd=os.getcwd()):
         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)