Put a copy of 'WebKit Mac10.13 (retina)' into chromium.mac.

These configs will be used from LUCI builders. Old configs can be removed all
at once when chromium.webkit Buildbot master is brought down.

R=dpranke@chromium.org, jchinlee@chromium.org
BUG=864817, 818301

Change-Id: Iddc309c9fcd7b5fdce168171524ed051bada9e0e
Reviewed-on: https://chromium-review.googlesource.com/c/1262974
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596952}

testing/buildbot/chromium.mac.json

@@ -5763,6 +5763,36 @@
       }
     ]
   },
+  "WebKit Mac10.13 (retina)": {
+    "isolated_scripts": [
+      {
+        "args": [
+          "--num-retries=3"
+        ],
+        "isolate_name": "webkit_layout_tests_exparchive",
+        "merge": {
+          "args": [
+            "--verbose"
+          ],
+          "script": "//third_party/blink/tools/merge_web_test_results.py"
+        },
+        "name": "webkit_layout_tests",
+        "results_handler": "layout tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "gpu": "1002:6821",
+              "hidpi": "1",
+              "os": "Mac-10.13.6",
+              "pool": "Chrome-GPU"
+            }
+          ],
+          "shards": 12
+        }
+      }
+    ]
+  },
   "mac-jumbo-rel": {
     "additional_compile_targets": [
       "all"

testing/buildbot/waterfalls.pyl

@@ -3225,6 +3225,21 @@
           'isolated_scripts': 'chromium_dbg_isolated_scripts',
         },
       },
+      'WebKit Mac10.13 (retina)': {
+        'test_suites': {
+          'isolated_scripts': 'chromium_webkit_isolated_scripts',
+        },
+        'swarming': {
+          'dimension_sets': [
+            {
+              'gpu': '1002:6821',
+              'hidpi': '1',
+              'os': 'Mac-10.13.6',
+              'pool': 'Chrome-GPU',
+            }
+          ],
+        },
+      },
       'mac-jumbo-rel': {
         'additional_compile_targets': [
           'all'
@@ -3419,6 +3434,8 @@
           'isolated_scripts': 'chromium_webkit_isolated_scripts',
         },
       },
+      # TODO(vadimsh): This builder is in chromium.mac on LUCI, see
+      # crbug.com/864817.
       'WebKit Mac10.13 (retina)': {
         'test_suites': {
           'isolated_scripts': 'chromium_webkit_isolated_scripts',

tools/mb/mb_config.pyl

@@ -367,6 +367,7 @@
       'ios-simulator-cronet': 'ios',
       'ios-simulator-full-configs': 'ios',
       'ios-simulator-xcode-clang': 'ios',
+      'WebKit Mac10.13 (retina)': 'release_bot',
     },
 
     'chromium.memory': {
@@ -452,6 +453,7 @@
       'Win V8 FYI Release (NVIDIA)': 'gpu_tests_release_trybot_x86_minimal_symbols',
     },
 
+    # TODO(crbug.com/818301): This master is going away.
     'chromium.webkit': {
       'Android Builder': 'android_release_bot_minimal_symbols',
       'WebKit Linux Trusty ASAN': 'asan_lsan_release_bot',