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This CL adds custom chromevox announcements for all
settings pages in the system tray.

Bug: 1009714
Change-Id: Ied1735f1afc1289de6c66fb449c1bce70ac5fd25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037956Reviewed-by: Tim Song <tengs@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738667}