Make focus-visible tests easier to eyeball

Bug: 817199
Change-Id: Iea196f7b7679c2edee47e5d17b0cab39d28c2aeb
Reviewed-on: https://chromium-review.googlesource.com/1125552
Commit-Queue: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572681}
7 files changed