GitLab

Add the media metadata to the AX data so that it can
be picked up by a screen reader.

BUG=962682

Change-Id: I78a0d5c09c13450d5486c94b7d04b5fa36cce9b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610028
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Auto-Submit: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659281}