Summary

This issue is a fork of #70027 for platform-mac. #70027 should be treated as upstream. Build tests for platform-mac should mirror platform-windows as closely as possible.

Child issue of #109633. Related to #109618.

Launch Checklist

• [macOS] Bring up "complex_layout" devicelab, startup tests for x86. #110083
• [macOS] Bring up "flutter_gallery" devicelab, startup tests for x86. #110084
• [macOS] Bring up "flutter_view" devicelab, startup tests for x86. #110085
• [macOS] Bring up "platform_view" devicelab, startup tests for x86. #110086