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Trying to reland #140115 which I had to revert in #142889 because [it broke the tree](https://github.com/flutter/flutter/pull/140115#issuecomment-1925774719). In this PR I fixed the post-submit following tests:
complex_layout
Scrolling benchmark
To run the scrolling benchmark on a device:
flutter drive --profile test_driver/scroll_perf.dart
Results should be in the file build/complex_layout_scroll_perf.timeline_summary.json.
More detailed logs should be in build/complex_layout_scroll_perf.timeline.json.
Startup benchmark
To measure startup time on a device:
flutter run --profile --trace-startup
The results should be in the logs.
Additional results should be in the file build/start_up_info.json.