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This change sets the accessible name and role so that useful
content is read aloud to the user when this view is focused using
ChromeVox. This also fixes a bug where gibberish data was read when
invoking the "Read page title" ChromeVox hotkey combo on the lock
screen.

Bug: 887760
Change-Id: I6506620eb21afd59f696b41a1222d329e11ff34f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774829Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694813}