Make changes to support bisect for android-chrome.

tools/auto_bisect/bisect_perf_regression.py

 #!/usr/bin/env python
 # Copyright (c) 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.
 
 """Performance Test Bisect Tool
 
 This script bisects a series of changelists using binary search. It starts at
 a bad revision where a performance metric has regressed, and asks for a last
 known-good revision. It will then binary search across this revision range by
@@ skipping 1883 matching lines @@
     Args:
       good_revision: Number/tag of the known good revision.
       bad_revision: Number/tag of the known bad revision.
 
     Returns:
       True if the revisions are in the proper order (good earlier than bad).
     """
     cwd = self.depot_registry.GetDepotDir(target_depot)
     good_position = source_control.GetCommitPosition(good_revision, cwd)
     bad_position = source_control.GetCommitPosition(bad_revision, cwd)
+    # Compare commit timestamp for repos that don't support commit position.
+    if not (bad_position and good_position):
+      good_position = source_control.GetCommitTime(good_revision, cwd=cwd)
+      bad_position = source_control.GetCommitTime(bad_revision, cwd=cwd)
 
     return good_position <= bad_position
 
   def CanPerformBisect(self, good_revision, bad_revision):
     """Checks whether a given revision is bisectable.
 
     Checks for following:
     1. Non-bisectable revsions for android bots (refer to crbug.com/385324).
     2. Non-bisectable revsions for Windows bots (refer to crbug.com/405274).
 
@@ skipping 678 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())