Run most of the tests on "Win x64 GN" that "Win7 x64 Tests (1)" does.

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 the list of configs that you can pass to mb; each config
   # represents a particular combination of GYP_DEFINES/gn args that
   # we must support. A given config *may* be platform-specific but
   # is not necessarily so (i.e., we might have mac, win, and linux
   # bots all using the 'gn_release_bot' config).
@@ skipping 781 matching lines @@
       'linux_perf_cq': 'gn_official_goma',
       'mac_retina_perf_cq': 'gyp_official_goma',
       'winx64_10_perf_cq': 'gyp_official_goma_minimal_symbols_x64',
       'linux_fyi_perf_bisect': 'gn_official_goma',
       'mac_fyi_perf_bisect': 'gyp_official_goma',
       'win_fyi_perf_bisect': 'gyp_official_goma_minimal_symbols_x86',
     },
     'tryserver.chromium.win': {
       'win_chromium_gn_x64_dbg': 'gn_debug_bot_minimal_symbols',
       'win_chromium_gn_x64_rel': 'gn_release_trybot',
+      'win_chromium_x64_rel_ng': 'gn_release_trybot',
       'win8_chromium_ng': 'gn_release_trybot_x86',
       'win8_chromium_gn_dbg': 'gn_debug_bot_minimal_symbols_x86',
       'win8_chromium_gn_rel': 'gn_release_trybot_x86',
       'win8_chromium_gn_upload': 'gn_release_bot_minimal_symbols_x86',
       'win_clang_x64_dbg': 'win_clang_debug_bot',
     },
     'tryserver.v8': {
       'v8_linux_chromium_gn_rel': 'gn_release_trybot',
       'v8_android_chromium_gn_dbg': 'android_gn_debug_bot',
       'v8_linux_blink_rel': 'swarming_gn_release_trybot_minimal_symbols_x64',
     },
   },
 }