Teach Mac GPU ASAN Release that it's using mb.

scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py

 # Copyright 2015 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.
 
 from . import steps
 
 SPEC = {
   'settings': {
     'build_gs_bucket': 'chromium-gpu-fyi-archive',
     # WARNING: src-side runtest.py is only tested with chromium CQ builders.
@@ skipping 827 matching lines @@
       'testing': {
         'platform': 'mac',
       },
       # Swarming is deliberately NOT enabled on this one-off configuration.
       # Multiple copies of the machines have to be deployed into swarming
       # in order to keep up with the faster cycle time of the tests.
       'enable_swarming': False,
     },
     'Mac GPU ASAN Release': {
       'chromium_config': 'chromium',
-      'chromium_apply_config': ['ninja_confirm_noop'],
+      'chromium_apply_config': ['mb', 'ninja_confirm_noop'],
       'gclient_config': 'chromium',
+      'gclient_apply_config': ['chrome_internal', 'angle_top_of_tree'],
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Release',
         'TARGET_BITS': 64,
       },
       'test_generators': [
         steps.generate_gtest,
         steps.generate_script,
         steps.generate_isolated_script,
       ],
       'bot_type': 'builder_tester',
@@ skipping 330 matching lines @@
         'aura_builder',
       ],
       'testing': {
         'platform': 'linux',
       },
       'enable_swarming': False,
       'use_isolate': True,
     },
   },
 }