8e68e89f66a4fbba4215be1b0ceca80ce5ba8b46
iOS does not allow usage of OpenGL ES APIs when the app has been moved to the background. With this change, the shell will wait until pending IO thread tasks complete and the Skia unref queue is drained before proceeding with shutdown. See https://github.com/flutter/flutter/issues/17511
Drain any pending work on the IO thread before shutting down the platform view (flutter/engine#5272)
Description
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