Add tests for Chromium Mac 10.10 on FYI

BUG=388749

Review URL: https://codereview.chromium.org/520913004

Cr-Commit-Position: refs/heads/master@{#292969}

testing/buildbot/chromium.fyi.json

@@ -270,5 +270,52 @@
     "gtest_tests": [
       {"test": "browser_tests", "shard_index": 2, "total_shards": 3}
     ]
+  },
+  "Chromium Mac 10.10": {
+    "gtest_tests": [
+      "accessibility_unittests",
+      "app_list_unittests",
+      "base_unittests",
+      "cacheinvalidation_unittests",
+      "cast_unittests",
+      "cc_unittests",
+      "chromedriver_unittests",
+      "components_unittests",
+      "content_browsertests",
+      "content_unittests",
+      "crypto_unittests",
+      "extensions_unittests",
+      "gcm_unit_tests",
+      "gfx_unittests",
+      "gpu_unittests",
+      "google_apis_unittests",
+      "interactive_ui_tests",
+      "ipc_tests",
+      "jingle_unittests",
+      "media_unittests",
+      "message_center_unittests",
+      "mojo_apps_js_unittests",
+      "mojo_common_unittests",
+      "mojo_js_unittests",
+      "mojo_public_bindings_unittests",
+      "mojo_public_environment_unittests",
+      "mojo_public_system_unittests",
+      "mojo_public_utility_unittests",
+      "mojo_application_manager_unittests",
+      "mojo_shell_tests",
+      "mojo_system_unittests",
+      "net_unittests",
+      "ppapi_unittests",
+      "printing_unittests",
+      "remoting_unittests",
+      "sandbox_mac_unittests",
+      "sql_unittests",
+      "sync_integration_tests",
+      "sync_unit_tests",
+      "ui_unittests",
+      "unit_tests",
+      "url_unittests",
+      "browser_tests"
+    ]
   }
 }