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The main change in this CL is the addition of the Smart Lock icon, and
with it the necessary infrastructure for adding the of the icons. There
are also some alignment and naming cleanups.

Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I13b32e26228bbea02378ef03a74405be1b926c46
Reviewed-on: https://chromium-review.googlesource.com/1136896Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575100}