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This change adds a new announcement which occurs when chromevox is
enabled and an app list item with a notification badge is focused.

Bug: 1126492
Change-Id: If581feecd46141dfa5027349c6e55575829d6b34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423054Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809862}