GitLab

When the user does not input any text in the free-form text box, we
bring them back to it and don't let them send the report. However, right
now we do this without signaling an alert to screen readers. Add an aria
alert outside of the textbox to signal this.

Also, update the text of the alert.

BUG=chromium:1107656
TEST=deploy, enable chromevox, click "Send" with empty textarea, verify\
     that alert text is read and focus is returned to textarea

Change-Id: Ifd08ca90121ecd683b83225c27dfaae1ac2b9f4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464767Reviewed-by: Ian Barkley-Yeung <iby@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Miriam Zimmerman <mutexlox@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816593}