GitLab

Add "How your device appears to others" help text underneath the device
name input on the onboarding page.

Adjust layout. Expand input to 50% width, accounting for margin.
Baseline of input centered vertically. Image centered vertically.
Margins adjusted to spec.

Screenshot: https://screenshot.googleplex.com/AapmoYP4m5Jhwrv.png

Bug: b/163036847
Change-Id: I258c7be50e497d981a677b3d6c9bb196529afaee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575211
Commit-Queue: Curt Clemens <cclem@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#834458}