Add checkmark to base-select options
This is being discussed in OpenUI here:
openui/open-ui#863
The discussion suggested that we should use a unicode checkmark instead
of an SVG, so that's what this patch does.
It might be better to use ::marker instead of ::before, but we might
also end up with something else entirely and I think that reusing
::marker would be harder to implement, so I am using ::before for now.
Bug: 1511354
Change-Id: I29c1dfc26208e6fc13cf42782a3d9d6fae2e711c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5578818
Reviewed-by: David Baron dbaron@chromium.org
Commit-Queue: Joey Arhar jarhar@chromium.org
Cr-Commit-Position: refs/heads/main@{#1313329}