Update from https://crrev.com/327068

testing/buildbot/tryserver.chromium.mac.json

Index: testing/buildbot/tryserver.chromium.mac.json
diff --git a/testing/buildbot/tryserver.chromium.mac.json b/testing/buildbot/tryserver.chromium.mac.json
index 2c63c0851048d8f7bff41ecf0f8cee05f52fd120..4a46f9a42d9122f1b61b72d57147a329393d8920 100644
--- a/testing/buildbot/tryserver.chromium.mac.json
+++ b/testing/buildbot/tryserver.chromium.mac.json
@@ -1,2 +1,72 @@
 {
+  "mac_chromium_gn_dbg": {
+    "additional_compile_targets": [
+      "accessibility_unittests",
+      "base_unittests",
+      "cacheinvalidation_unittests",
+      "cast_unittests",
+      "cc_unittests",
+      "chromedriver_unittests",
+      "crypto_unittests",
+      "gcm_unit_tests",
+      "gn_unittests",
+      "gpu_unittests",
+      "ipc_tests",
+      "jingle_unittests",
+      "media_unittests",
+      "mojo_common_unittests",
+      "mojo_public_bindings_unittests",
+      "mojo_public_environment_unittests",
+      "mojo_public_system_unittests",
+      "mojo_public_utility_unittests",
+      "mojo_system_unittests",
+      "ppapi_unittests",
+      "printing_unittests",
+      "skia_unittests",
+      "sql_unittests",
+      "sync_unit_tests",
+      "ui_base_unittests",
+      "url_unittests"
+    ],
+    "gtest_tests": [
+      {
+        "test": "base_unittests"
+      }
+    ]
+  },
+  "mac_chromium_gn_rel": {
+    "additional_compile_targets": [
+      "accessibility_unittests",
+      "base_unittests",
+      "cacheinvalidation_unittests",
+      "cast_unittests",
+      "cc_unittests",
+      "chromedriver_unittests",
+      "crypto_unittests",
+      "gcm_unit_tests",
+      "gn_unittests",
+      "gpu_unittests",
+      "ipc_tests",
+      "jingle_unittests",
+      "media_unittests",
+      "mojo_common_unittests",
+      "mojo_public_bindings_unittests",
+      "mojo_public_environment_unittests",
+      "mojo_public_system_unittests",
+      "mojo_public_utility_unittests",
+      "mojo_system_unittests",
+      "ppapi_unittests",
+      "printing_unittests",
+      "skia_unittests",
+      "sql_unittests",
+      "sync_unit_tests",
+      "ui_base_unittests",
+      "url_unittests"
+    ],
+    "gtest_tests": [
+      {
+        "test": "base_unittests"
+      }
+    ]
+  }
 }