Jason Simmons d1d5497999
Drain any pending work on the IO thread before shutting down the platform view (#5272)
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
2018-05-15 17:40:25 -07:00
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