Make bisect to abort early when the return codes for known good and known bad revisions are same.

tools/auto_bisect/bisect_printer.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.
 
 """This file contains printing-related functionality of the bisect."""
 
 import datetime
 import re
 
 from bisect_results import BisectResults
@@ skipping 106 matching lines @@
       bisect_utils.OutputAnnotationStepClosed()
 
   def PrintPartialResults(self, bisect_state):
     revision_states = bisect_state.GetRevisionStates()
     first_working_rev, last_broken_rev = BisectResults.FindBreakingRevRange(
         revision_states)
     self._PrintTestedCommitsTable(revision_states, first_working_rev,
                                   last_broken_rev, 100, final_step=False)
 
   def _PrintAbortResults(self, abort_reason):
-
     if self.opts.output_buildbot_annotations:
       bisect_utils.OutputAnnotationStepStart('Results')
     print ABORT_REASON_TEMPLATE % {
         'abort_reason': abort_reason,
         'bug_id': self.opts.bug_id or 'NOT SPECIFIED',
         'command': self.opts.command,
-        'metric': '/'.join(self.opts.metric),
+        'metric': ('/'.join(self.opts.metric)
+                   if self.opts.metric else 'NOT SPECIFIED'),

[qyearsley, 2015/06/23 20:47:45]

This change could also potentially go in a separate CL.

[prasadv, 2015/06/23 21:37:48]

I think this should be a part of this CL itself

         'good_revision': self.opts.good_revision,
         'bad_revision': self.opts.bad_revision,
     }
     self._PrintThankYou()
     if self.opts.output_buildbot_annotations:
       bisect_utils.OutputAnnotationStepClosed()
 
   @staticmethod
   def _PrintThankYou():
     print RESULTS_THANKYOU
@@ skipping 181 matching lines @@
 
   @staticmethod
   def _PrintWarnings(warnings):
     """Prints a list of warning strings if there are any."""
     if not warnings:
       return
     print
     print 'WARNINGS:'
     for w in set(warnings):
       print '  ! %s' % w