Chris Bracken 276cbb1c27
Apply media bottom padding in BottomNavigationBar (#13431)
Updates scaffold to expose bottom padding to the associated
BottonNavigationBar (if present). BottomNavigationBar is now responsible
for adjusting itself to account for bottom padding.

This change is necessary to support the updated BottomNavigationBar
layout for the iPhone X.
2017-12-07 18:15:29 -08:00
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