Add ToTWinLibcxx64 bot (src).

This bot is for testing that we can build with the libc++ standard
library on Windows.

Bug: 801780
Change-Id: Ifeb58bf7dfeec79afcdb30308b436d86d5769d36
Reviewed-on: https://chromium-review.googlesource.com/920741
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536930}

testing/buildbot/chromium.clang.json

@@ -9917,6 +9917,350 @@
       }
     ]
   },
+  "ToTWinLibcxx64": {
+    "gtest_tests": [
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "angle_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "app_shell_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "aura_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "base_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "blink_heap_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "blink_platform_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "shards": 10
+        },
+        "test": "browser_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "cacheinvalidation_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "capture_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "chrome_app_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "chrome_elf_import_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "chrome_elf_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "components_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "compositor_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "content_browsertests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "content_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "courgette_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "crashpad_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "crypto_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "device_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "extensions_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "gcm_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "google_apis_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "gpu_ipc_service_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "gpu_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "install_static_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "integrity": "high"
+            }
+          ]
+        },
+        "test": "installer_util_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "ipc_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "jingle_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "media_blink_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "media_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "midi_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "native_theme_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "net_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "notification_helper_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "pdf_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "ppapi_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "printing_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "remoting_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "integrity": "high"
+            }
+          ]
+        },
+        "test": "sbox_integration_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "sbox_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "sbox_validation_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "services_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "integrity": "high"
+            }
+          ]
+        },
+        "test": "setup_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "skia_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "sql_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "ui_base_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "url_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "views_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "webkit_unit_tests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "wm_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "wtf_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "zucchini_unittests"
+      }
+    ]
+  },
   "ToTWinThinLTO64": {
     "gtest_tests": [
       {

testing/buildbot/waterfalls.pyl

@@ -789,6 +789,11 @@
           'gtest_tests': 'chromium_win_clang_gtests',
         },
       },
+      'ToTWinLibcxx64': {
+        'test_suites': {
+          'gtest_tests': 'chromium_win_clang_gtests',
+        },
+      },
       'ToTWinThinLTO64': {
         'test_suites': {
           'gtest_tests': 'chromium_win_clang_gtests',

tools/mb/mb_config.pyl

@@ -151,6 +151,7 @@
       'ToTWin64(dll)': 'clang_tot_shared_release_dcheck',
       'ToTWinCFI': 'clang_tot_cfi_full_cfi_diag_thin_lto_release_static_dcheck_always_on_x86',
       'ToTWinCFI64': 'clang_tot_cfi_full_cfi_diag_thin_lto_release_static_dcheck_always_on',
+      'ToTWinLibcxx64': 'clang_tot_official_minimal_symbols_static_release_libcxx',
       'ToTWinThinLTO64': 'clang_tot_official_full_symbols_thin_lto_static_use_lld',
       'ToTiOS': 'ios',
       'UBSanVptr Linux': 'ubsan_vptr_release_bot',
@@ -1240,6 +1241,10 @@
       'clang_tot', 'official', 'minimal_symbols', 'static', 'release', 'x86',
     ],
 
+    'clang_tot_official_minimal_symbols_static_release_libcxx': [
+      'clang_tot', 'official', 'minimal_symbols', 'static', 'release', 'libcxx',
+    ],
+
     'clang_tot_release_minimal_symbols_thin_lto_static_use_lld': [
       'clang_tot', 'release', 'minimal_symbols', 'thin_lto', 'static', 'use_lld',
     ],
@@ -1997,6 +2002,10 @@
       'gn_args': 'use_jumbo_build=true jumbo_file_merge_limit=50',
     },
 
+    'libcxx': {
+      'gn_args': 'use_custom_libcxx=true',
+    },
+
     'libfuzzer': { 'gn_args': 'use_libfuzzer=true' },
 
     'lsan': {