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If the app icon has the pause or block badge, announce 'Paused' or
'Blocked' for Chrome Vox, when the icon item is selected/focused from
shelf.

Add the AppStatus to ShelfItem to record whether the app is paused or
blocked, to announce 'blocked' or 'paused' when the shelf item is
focused. Example:
'Gmail button. Blocked' / 'Gmail button. Paused'.

Block badge has higher priority. When the app is paused and blocked,
set the block badge, and announce 'Blocked'.

Add test cases to verify the change, including the priority for the
block and pause status.

BUG=1144384

Change-Id: I8a849dae570152634d2f1c2767f37848e8ead474
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550104
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829986}