Resolver/Chooser - Window inset fixes

Resolver supports numerous layouts, with optional ViewGroups. Need to
make sure the window inset is applied to the correct view. If there is
a List present, add a footer so that the list scrolls underneath the
navbar.

Test: atest ResolverActivityTest, ChooserActivityTest
Bug: 142726977
Change-Id: I34cb037046892ac96c16d705f1d8d833040a3e2c