Add target_build_type flag to bisect-perf-regression tool to enable bisecting of a Debug build with…

tools/bisect-manual-test.py

 #!/usr/bin/env python
 # Copyright 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.
 
 """Simple script which asks user to manually check result of bisection.
 
 Typically used as by the run-bisect-manual-test.py script.
 """
 
 import os
 import sys
 
 sys.path.append(os.path.join(os.path.dirname(__file__), 'telemetry'))
 from telemetry.core import browser_finder
 from telemetry.core import browser_options
 
 
 def _StartManualTest(options):
   """Start browser then ask the user whether build is good or bad."""
   browser_to_create = browser_finder.FindBrowser(options)
   print 'Starting browser: %s.' % options.browser_type
   with browser_to_create.Create() as browser:
-    browser.Start();
-
     # Loop until we get a response that we can parse.
     while True:
       sys.stderr.write('Revision is [(g)ood/(b)ad]: ')
       response = raw_input()
       if response and response in ('g', 'b'):
         if response in ('g'):
           print "RESULT manual_test: manual_test= 1"
         else:
           print "RESULT manual_test: manual_test= 0"
         break
 
-    browser.Close()
-
-
 def main():
   usage = ('%prog [options]\n'
            'Starts browser with an optional url and asks user whether '
            'revision is good or bad.\n')
 
   options = browser_options.BrowserFinderOptions()
   parser = options.CreateParser(usage)
   options, args = parser.parse_args()
 
   _StartManualTest(options)
 
 
 if __name__ == '__main__':
   sys.exit(main())