Make linux_blink_oilpan_rel run layout tests only for changes touching third_party/WebKit

scripts/slave/recipes/chromium_trybot.py

 # 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.
 
 import collections
 
 from recipe_engine.types import freeze
 
 DEPS = [
   'amp',
@@ skipping 135 matching lines @@
         'os': 'Windows',
       },
      ],
   },
 })
 
 
 # TODO(phajdan.jr): Remove special case for layout tests.
 # This could be done by moving layout tests to main waterfall.
 CHROMIUM_BLINK_TESTS_BUILDERS = freeze([
+  'linux_blink_oilpan_rel',
   'linux_chromium_rel_ng',
   'mac_chromium_rel_ng',
   'win_chromium_rel_ng',
 ])
 
 
 CHROMIUM_BLINK_TESTS_PATHS = freeze([
   # Service worker code is primarily tested in Blink layout tests.
   'content/browser/service_worker',
   'content/child/service_worker',
@@ skipping 910 matching lines @@
                            api.test_utils.canned_test_output(passing=True))
   )
 
   yield (
     api.test('use_v8_patch_on_blink_trybot') +
     props(mastername='tryserver.blink',
           buildername='mac_blink_rel',
           patch_project='v8') +
     api.platform.name('mac')
   )