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This would be translated to ATK_ROLE_ALERT by the auralinux
accessibility code. Assistive technologies are expected to respond
to this role by reading the contents of the ALERT container.

Bug: 1023822
Change-Id: I763ee4047c8ba4fb09f2e77f9ddc9f6e8eaabbe9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010846
Commit-Queue: Jacobo Aragunde Pérez <jaragunde@igalia.com>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735392}