[macOS] Bring up "flutter_gallery" devicelab, start up test for x86. (#110370)

.ci.yaml

@@ -2478,6 +2478,20 @@ targets:
         ["devicelab", "hostonly"]
       task_name: flutter_gallery_macos__compile
 
+  - name: Mac flutter_gallery_macos__start_up
+    bringup: true # New target https://github.com/flutter/flutter/issues/109633
+    recipe: devicelab/devicelab_drone
+    timeout: 60
+    properties:
+      dependencies: >-
+        [
+          {"dependency": "xcode", "version": "13f17a"},
+          {"dependency": "gems", "version": "v3.3.14"}
+        ]
+      tags: >
+        ["devicelab", "hostonly"]
+      task_name: flutter_gallery_macos__compile
+
   - name: Mac framework_tests_libraries
     recipe: flutter/flutter_drone
     timeout: 60

TESTOWNERS

@@ -234,6 +234,7 @@
 /dev/devicelab/bin/tasks/windows_startup_test.dart @loic-sharma @flutter/desktop
 /dev/devicelab/bin/tasks/complex_layout_macos__compile.dart @a-wallen @flutter/desktop
 /dev/devicelab/bin/tasks/flutter_gallery_macos__compile.dart @a-wallen @flutter/desktop
+/dev/devicelab/bin/tasks/flutter_gallery_macos__start_up.dart @a-wallen @flutter/desktop
 
 ## Host only framework tests
 # Linux analyze

dev/devicelab/bin/tasks/flutter_gallery_mac__start_up.dart → dev/devicelab/bin/tasks/flutter_gallery_macos__start_up.dart

@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:flutter_devicelab/framework/devices.dart';
 import 'package:flutter_devicelab/framework/framework.dart';
 import 'package:flutter_devicelab/tasks/perf_tests.dart';
 
 Future<void> main() async {
-  // It's intended to use the Gallery startup test as a smoke test on macOS
-  // Catalina.
+  deviceOperatingSystem = DeviceOperatingSystem.macos;
   await task(createFlutterGalleryStartupTest());
 }