Srujan Gaddam 42c28d6091 Incorporate compat info changes into flutter engine (flutter/engine#19606)
Changes related to compatibility info require changes in
Flutter engine libraries. This CL adds null-asserts wherever
necessary to maintain behavior and adds some small modifications
to handle the change in nullability. Warnings about unnecessary
null assertions are disabled temporarily in this CL as well.

Original issue: https://github.com/dart-lang/sdk/issues/41905
2020-07-10 16:49:58 -07:00
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