Greg Spencer 18125adcfc Reland: "Determine lifecycle by looking at window focus also" (#41094) (flutter/engine#41702)
## Description

This reverts commit e49577708d9d5315fa6c001d7dc20ee80d04cd35 to re-land #41094 because the Google test failures have been fixed. There are no changes to the original PR, since the fixes were in the Google code.
2023-05-03 19:21:58 +00:00
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