testing: add "Chromium Mac Goma RBE Staging (clobber)"

Bug: 835732
Change-Id: I04f6e2cbb3808355d4d9d86b99dbffa34ecd6f74
Reviewed-on: https://chromium-review.googlesource.com/c/1290711Reviewed-by: Shinya Kawanaka <shinyak@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Fumitoshi Ukai <ukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602276}

testing/buildbot/chromium.goma.json

@@ -134,6 +134,25 @@
       }
     ]
   },
+  "Chromium Mac Goma RBE Staging (clobber)": {
+    "additional_compile_targets": [
+      "all"
+    ],
+    "gtest_tests": [
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "base_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "content_unittests"
+      }
+    ]
+  },
   "Chromium Mac Goma Staging": {
     "additional_compile_targets": [
       "all"

testing/buildbot/waterfalls.pyl

@@ -1581,6 +1581,14 @@
           'gtest_tests': 'goma_gtests',
         },
       },
+      'Chromium Mac Goma RBE Staging (clobber)': {
+        'additional_compile_targets': [
+          'all',
+        ],
+        'test_suites': {
+          'gtest_tests': 'goma_gtests',
+        },
+      },
       'Chromium Mac Goma Staging': {
         'additional_compile_targets': [
           'all',