To accommodate three lines as before, we now adjust the size
of text and icons to fit.
Also in this change:
- snazzy little shadow below BigPicture's 1U block
- restore contentText to BigPicture notifications
- make overflow match other notification text (not so big)
- fix text position jumps between 1U and expanded
notifications across all templates
Bug: 6519374 (three-line notifications cut off)
Bug: 6494982 (text jumps)
Change-Id: I717ec2dde805c25e3b949641ca7e69e4d8fc86d2
9f7936a30b