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This CL adds announcements to be read with VoiceOver for the in product
helps.

Bug: 866936
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ie89fa1b2b0179a8070351c2ce926ac18158ebdef
Reviewed-on: https://chromium-review.googlesource.com/1154536Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579336}