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Fixes https://github.com/flutter/flutter/issues/126878 This disables device private upload on iOS when backgrounded, and disables mipmap generation when backgrounded. We don't have a good way to test the core problem in this repo because it only reproduces on physical iOS hardware - simulators don't really care if you do this stuff in the background. I'll write a devicelab test in the framework to capture this. In the mean time it can be reviewed. We could consider making the IOManager a shared_ptr instead of having an fml::WeakPtr and that'd clean up some of the extra arguments to engine construction - or we could consider vending the sync switch from impeller::Context unconditionally, but it's pretty iOS specific...