Make corrections to logcat path for perf bisect jobs.

build/android/buildbot/bb_device_steps.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.
 
 import collections
 import glob
 import hashlib
 import json
 import os
@@ skipping 631 matching lines @@
   parser.add_option(
       '--flakiness-server',
       help=('The flakiness dashboard server to which the results should be '
             'uploaded.'))
   parser.add_option(
       '--auto-reconnect', action='store_true',
       help='Push script to device which restarts adbd on disconnections.')
   parser.add_option(
       '--logcat-dump-output',
       help='The logcat dump output will be "tee"-ed into this file')
+  # During processing perf bisects, a seperate working directory created under
+  # which builds are produced. Therefore we should look for relevent output
+  # file under this directory.(/b/build/slave/<slave_name>/build/bisect/src/out)
+  parser.add_option(
+      '--chrome-output-dir',
+      help='Chrome output directory to be used while bisecting.')
+
   parser.add_option('--disable-stack-tool',  action='store_true',
       help='Do not run stack tool.')
   parser.add_option('--asan-symbolize',  action='store_true',
       help='Run stack tool for ASAN')
   return parser
 
 
 def main(argv):
   parser = GetDeviceStepsOptParser()
   options, args = parser.parse_args(argv[1:])
 
   if args:
     return sys.exit('Unused args %s' % args)
 
   unknown_tests = set(options.test_filter) - VALID_TESTS
   if unknown_tests:
     return sys.exit('Unknown tests %s' % list(unknown_tests))
 
   setattr(options, 'target', options.factory_properties.get('target', 'Debug'))
+
+  if options.chrome_output_dir:
+    global CHROME_OUT_DIR
+    global LOGCAT_DIR
+    CHROME_OUT_DIR = options.chrome_output_dir
+    LOGCAT_DIR = os.path.join(CHROME_OUT_DIR, 'logcat')
+
   if options.coverage_bucket:
     setattr(options, 'coverage_dir',
             os.path.join(CHROME_OUT_DIR, options.target, 'coverage'))
 
   MainTestWrapper(options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))