Add mb_config for the new ubsan try bot.

tools/mb/mb_config.pyl

 # 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.
 
 {
   # This is a map of buildbot master names -> buildbot builder names ->
   # config names (where each config name is a key in the 'configs' dict,
   # below). MB uses this dict to look up which config to use for a given bot.
   'masters': {
     'chromeos.chrome': {
@@ skipping 521 matching lines @@
       'linux_chromium_headless_dbg': '//build/args/bots/tryserver.chromium.linux/linux_chromium_headless_dbg.gn',
       'linux_chromium_headless_rel': '//build/args/bots/tryserver.chromium.linux/linux_chromium_headless_rel.gn',
 
       # This is intentionally a release_bot and not a release_trybot;
       # enabling DCHECKs seems to cause flaky failures that don't show up
       # on the continuous builder.
       'linux_chromium_msan_rel_ng': 'msan_release_bot',
 
       'linux_chromium_rel_ng': 'gpu_tests_release_trybot',
       'linux_chromium_tsan_rel_ng': 'tsan_disable_nacl_release_trybot',
+      'linux_chromium_ubsan_rel_ng': 'ubsan_vptr_release_trybot',
 
       # This is 'release_bot' rather than 'release_trybot' because
       # 'release_trybot' includes 'dcheck_always_on', which might cause
       # some layout test results to be different than for normal release
       # builds (and we only store baselines for release builds).
       'linux_layout_tests_slimming_paint_v2': 'release_bot',
 
       'linux_nacl_sdk_build': 'release_bot',
       'linux_nacl_sdk': 'release_bot',
       'linux_optional_gpu_tests_rel': 'gpu_fyi_tests_release_trybot',
@@ skipping 874 matching lines @@
     ],
 
     'ubsan_vptr_edge_release_bot': [
       'ubsan_vptr', 'edge', 'release_bot',
     ],
 
     'ubsan_vptr_release_bot': [
       'ubsan_vptr', 'ubsan_no_recover_hack', 'release_bot',
     ],
 
+    'ubsan_vptr_release_trybot': [
+      'ubsan_vptr', 'ubsan_no_recover_hack', 'release_trybot',
+    ],
+
     'win_clang_debug_bot': [
       'clang', 'debug_bot', 'minimal_symbols',
     ],
 
     'windows_analyze': [
       'no_symbols', 'no_pch', 'shared', 'x86', 'win_analyze',
     ],
   },
 
   # This is a dict mapping a given 'mixin' name to a dict of settings that
@@ skipping 379 matching lines @@
       'gn_args': 'target_cpu="x86"',
     },
 
     'drfuzz': { 'gn_args': 'use_drfuzz=true' },
 
     'drmemory': {
       'gn_args': 'is_component_build=true enable_iterator_debugging=false',
     },
   },
 }