Add initial CL for RandomOrder chromium.fyi bot

scripts/slave/chromium/layout_test_wrapper.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """A wrapper script to run layout tests on the buildbots.
 
 Runs the run-webkit-tests script found in third_party/WebKit/Tools/Scripts above
 this script. For a complete list of command-line options, pass '--help' on the
 command line.
@@ skipping 77 matching lines @@
   if options.target:
     command.extend(['--target', options.target])
   if options.platform:
     command.extend(['--platform', options.platform])
   if options.skipped:
     command.extend(['--skipped', options.skipped])
   if options.no_pixel_tests:
     command.append('--no-pixel-tests')
   if options.enable_wptserve:
     command.append('--enable-wptserve')
+  # TODO: Do we need to add --order and --seed here?

[qyearsley, 2016/10/07 21:56:58]

Ah, good question -- I think we do. Note, I think that this layout tests wrapper
script is only used for some platforms currently.

[jeffcarp, 2016/10/07 23:16:35]

Added.

   if options.batch_size:
     command.extend(['--batch-size', options.batch_size])
   if options.run_part:
     command.extend(['--run-part', options.run_part])
   if options.builder_name:
     command.extend(['--builder-name', options.builder_name])
   if options.build_number:
     command.extend(['--build-number', options.build_number])
   command.extend(['--master-name', slave_utils.GetActiveMaster() or ''])
   if options.step_name:
@@ skipping 157 matching lines @@
   options, args = option_parser.parse_args()
   options.build_dir = build_directory.GetBuildOutputDirectory()
 
   # Disable pageheap checking except on Windows.
   if sys.platform != 'win32':
     options.enable_pageheap = False
   return layout_test(options, args)
 
 if '__main__' == __name__:
   sys.exit(main())