GitLab

This moves a couple of constants that are really local to individual files out
of layout_constants.* (which should only be used for cross-file concepts).

Along the way it makes two behavioral changes:
(1) The standard tab width in refresh and touchable refresh, not including
    endcaps, is increased from 193 to 268, per spec.
(2) The stacked tab width in touchable refresh is narrowed by about 8 DIP,
    because endcaps are actually narrower there than in touchable non-refresh,
    but the old code didn't take that into account.  I'm not aware of any
    particular spec on this.

I don't think there's a bug that covers making the standard tab width match the
sspec, interestingly enough.

BUG=none
TEST=none

Change-Id: Iddc6bbbff7730245b802f5a9faa6e40ee0baea02
Reviewed-on: https://chromium-review.googlesource.com/1112865Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570184}