Scroll to top of raw_contact on expansion

User feedback: when expanding a raw_contact section in the editor,
if it doesn't scroll onto screen, then the expanded section looks
like it is empty.

Therefore, we adjust the ScrollView's scrollY upon expanding
raw_contact editors. We also do some work to make sure that
focus makes sense after expanding/collapsing.

Bug: 18004959
Change-Id: Ib20c4d971d655650eea9e378e2ffde8876e5875c