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Enable viewport_test.dart's shuffling (#87319)

This PR fixed the problem that has prevented viewport_test.dart being shuffled.
T
Tong Mu committed
6823a56bed6b02b82d6625138905e4c8154e7878
Parent: ab6ce71
Committed by GitHub <noreply@github.com> on 7/30/2021, 9:23:46 PM