afohrman 3124f7dc3e Create public_attrs for bottomnavigation.
And add attributes to it.

None of these attributes were in widget's public_attrs, with the exception of menu. I'm not removing menu from widget's public_attrs, since NavigationView also uses that attribute.

Related side note: Before the package migration for bottomnavigation, BottomNavigationView used attributes declared by NavigationView, but for the package move, I made them standalone attributes to avoid creating circular dependencies. After cl/183574402 goes in, I'm going to consider making bottomnavigation depend on navigationview, and using NavigationView's attrs for BottomNavigationView.

PiperOrigin-RevId: 184201928
2018-03-12 12:27:13 -04:00
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