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Let CupertinoTabScaffold's tab be programmatically selectable (#16040)

* Let CupertinoTabScaffold's tab be programmatically selectable

* Re-use the tab bar's index instead

* review
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xster committed
b397406561f5e7a9c94e28f58d9e49fca0dd58b7
Parent: 68728e9
Committed by GitHub <noreply@github.com> on 4/2/2018, 8:53:20 PM