Apply more partner resources

 - Button background
 - Button background color
 - Button radius
 - Back button drawable
 - Button spacing

Fixes: 130542436
Test: In sample overlay app
Change-Id: I1f21e1de45eb5f932044499775fcbd76b302a29b
(cherry picked from commit ccab37ed499122d21caaec74eeca30591a6a9f29)