V8: Switch blink downstream bots to use mb

scripts/slave/recipes/blink_downstream.py

 # Copyright 2014 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.
 
 """
 This recipe can be used by components like v8 to verify blink tests with a
 low false positive rate. Similar to a trybot, this recipe compares test
 failures from a build with a current component revision with test failures
 from a build with a pinned component revision.
 
@@ skipping 115 matching lines @@
   # Sync component to current component revision.
   component_revision = api.properties.get('revision') or 'HEAD'
   api.gclient.c.revisions[bot_config['component']['path']] = (
       bot_config['component']['revision'] % component_revision)
 
   # Ensure we remember the chromium revision.
   api.gclient.c.got_revision_mapping['src'] = 'got_cr_revision'
 
   step_result = api.bot_update.ensure_checkout(force=True)
 
+  api.chromium.c.project_generator.tool = 'mb'
   api.chromium.runhooks()
-  api.chromium.compile()
+
+  api.chromium_tests.run_mb_and_compile(
+      ['blink_tests'], [],
+      name_suffix=' (with patch)',
+  )
 
   api.chromium.runtest('webkit_unit_tests', xvfb=True)
 
   def component_pinned_fn(_failing_steps):
     bot_update_json = step_result.json.output
     api.gclient.c.revisions['src'] = str(
         bot_update_json['properties']['got_cr_revision'])
     # Reset component revision to the pinned revision from chromium's DEPS
     # for comparison.
     del api.gclient.c.revisions[bot_config['component']['path']]
     # Update without changing got_revision. The first sync is the revision
     # that is tested. The second is just for comparison. Setting got_revision
     # again confuses the waterfall's console view.
     api.bot_update.ensure_checkout(force=True, update_presentation=False)
 
-    api.chromium.runhooks()
-    api.chromium.compile()
+    api.chromium_tests.run_mb_and_compile(
+        ['blink_tests'], [],
+        name_suffix=' (without patch)',
+    )
 
   extra_args = list(bot_config.get('test_args', []))
   if bot_config.get('additional_expectations'):
     extra_args.extend([
       '--additional-expectations',
       api.path['checkout'].join(*bot_config['additional_expectations']),
     ])
 
   tests = [
     api.chromium_tests.steps.BlinkTest(extra_args=extra_args),
@@ skipping 83 matching lines @@
   # and compare the lists of failing tests).
   yield (
     api.test('too_many_failures_for_retcode') +
     properties('client.v8.fyi', 'V8-Blink Linux 64') +
     api.override_step_data(with_patch,
                            canned_test(passing=False,
                                        num_additional_failures=125)) +
     api.override_step_data(without_patch,
                            canned_test(passing=True, minimal=True))
   )