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This CL modifies the behavior of alertdialogs on Android.

With this implementation, during an ALERT event, we will now
get the hint of the alertdialog and announce it as live text.
The current implementation relies on GetInnerText, which for
an alertdialog may be empty.

Authors are encouraged to set aria-describedby on an alertdialog
to reference the alert message element in the dialog. This
description will appear as a hint in GetHint, and so would be
announced with this change.

In the case that a page author does not include the hint, we
will still check GetInnerText as a potential fallback case.


Bug: 1114895
AX-Relnotes: Announce alertdialog content on creation
Change-Id: I67fbaf86da8c2352bf90f0b8a0d43d9a8499fc8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380586
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805529}