chromeos: Material Design version of Set Time dialog, part 2

Add styling to match spec. Update strings.

See bug for screenshots.

Bug: 927732
Change-Id: I852c6aec202fc83588b48889e7ca1f2829e8bc3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1532994
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643194}
4 files changed