Add config for Linux layout test try bot with --enable-slimming-paint-v2.

masters/master.tryserver.chromium.linux/master.cfg

 # -*- python -*-
 # ex: set syntax=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.
 
 # READ THIS:
 # See http://dev.chromium.org/developers/testing/chromium-build-infrastructure
 
 import os
@@ skipping 257 matching lines @@
 }
 
 # Optional Closure Compilation builder
 chromium_builders.append({
   'name': 'closure_compilation',
   'factory': baseFactory('closure_compilation'),
   # Share build directory with compatible existing builders to save space.
   'slavebuilddir': 'linux',
 })
 
+# Builder specifically to run layout tests with a particular flag (see crbug.com/622865).
+chromium_builders.append({
+  'name': 'linux_layout_tests_slimming_paint_v2',
+  'factory': m_remote_run('chromium_trybot'),
+})
+
 # Presubmit bots
 def presubmit(name, slavebuilddir=None, extra_props=None):
   properties = {'repo_name': name}
   properties.update(extra_props or {})
   return {
     'name': '%s_presubmit' % name,
     'slavebuilddir': (slavebuilddir or ('presubmit_%s' % name)),
     'factory': baseFactory(
         'run_presubmit', properties,
         max_time=master_utils.CQ_MAX_TIME),
@@ skipping 238 matching lines @@
 #  base.make_stop_form = hack_stop(base.make_stop_form)
 
 
 ####### PROJECT IDENTITY
 
 # The 'projectURL' string will be used to provide a link
 # from buildbot HTML pages to your project's home page.
 c['projectURL'] = 'http://dev.chromium.org/developers/testing/try-server-usage'
 
 # vi: set ts=4 sts=2 sw=2 et: