GitLab

Create a separate a11y-only aria-description text that reads relevant
info without needing to use the rendered DOM.

Also denote which element is selected via aria-selected.

Bug: 1017915,1017877
Change-Id: Ic4fc56eecf5f9d5b6fcdac319d5fb4ba78835262
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880273
Auto-Submit: Dan Beam <dbeam@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709629}