Background

google_mobile_ads 5.2.0 breaks the builds of Flutter apps: googleads/googleads-mobile-flutter#1193

As a result, the pub autoroller broke the tree (#156606) until we pinned google_mobile_ads to version 5.1.0 (#156911).

Known problems:

1. google_mobile_ads version 5.2.0 raised the required version of Xcode to 15.3
2. google_mobile_ads version 5.2.0 now contains Swift code. The platform_views_layout benchmark app is Objective-C, which causes issues like: Friction adding swift plugin to objective-c project #16049 (comment).

Work

• Wait until Flutter CI's Xcode is raised to 15.3 or higher: ☂️ Upgrade to macOS 14, Xcode 16, iOS 18 #148870
• Add use_frameworks! to dev/benchmarks/platform_views_layout/ios/Podfile so that the Objective-C app can use a Swift plugin
• Unpin google_mobile_ads.