New Print Preview Layout: Make focus more visible for PDF viewer buttons

Use a non-default opacity for the ripple of 0.5 in light mode only, per
UX recommendation. See bug for screenshot.

Bug: 961213
Change-Id: I1ee71b8b7596d6719351cb1ef57f476c1bc51dc5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1620309
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661448}
1 file changed