Add option to specify ADB binary in test runner.

build/android/test_runner.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.
 
 """Runs all types of tests from one unified interface."""
 
 import collections
 import logging
@@ skipping 73 matching lines @@
                    help=('Address of the server that is hosting the '
                          'Chrome for Android flakiness dashboard.'))
   group.add_option('--enable-platform-mode', action='store_true',
                    help=('Run the test scripts in platform mode, which '
                          'conceptually separates the test runner from the '
                          '"device" (local or remote, real or emulated) on '
                          'which the tests are running. [experimental]'))
   group.add_option('-e', '--environment', default='local',
                    help=('Test environment to run in. Must be one of: %s' %
                          ', '.join(constants.VALID_ENVIRONMENTS)))
+  group.add_option('--adb-path',
+                   help=('Specify the absolute path of the adb binary that '
+                         'should be used.'))
   option_parser.add_option_group(group)
 
 
 def ProcessCommonOptions(options, error_func):
   """Processes and handles all common options."""
   run_tests_helper.SetLogLevel(options.verbose_count)
   constants.SetBuildType(options.build_type)
   if options.build_directory:
     constants.SetBuildDirectory(options.build_directory)
   if options.output_directory:
     constants.SetOutputDirectort(options.output_directory)
+  if options.adb_path:
+    constants.SetAdbPath(options.adb_path)
+  # Some things such as Forwarder require ADB to be in the environment path.
+  adb_dir = os.path.dirname(constants.GetAdbPath())
+  if adb_dir and adb_dir not in os.environ['PATH'].split(os.pathsep):
+    os.environ['PATH'] = adb_dir + os.pathsep + os.environ['PATH']
   if options.environment not in constants.VALID_ENVIRONMENTS:
     error_func('--environment must be one of: %s' %
                ', '.join(constants.VALID_ENVIRONMENTS))
 
 
 def AddDeviceOptions(option_parser):
   group = optparse.OptionGroup(option_parser, 'Device Options')
   group.add_option('-c', dest='cleanup_test_files',
                    help='Cleanup test files on the device after run',
                    action='store_true')
@@ skipping 871 matching lines @@
 
 def main():
   signal.signal(signal.SIGUSR1, DumpThreadStacks)
   option_parser = command_option_parser.CommandOptionParser(
       commands_dict=VALID_COMMANDS)
   return command_option_parser.ParseAndExecute(option_parser)
 
 
 if __name__ == '__main__':
   sys.exit(main())