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This CL implements an alternative approach to aria-invalid
content on Android. The current implementation, see here:

https://chromium-review.googlesource.com/c/chromium/src/+/1320219

uses an ElapsedTimer to ensure that content invalid is set on
a focused field only during the first 6 seconds after the field
was focused. This prevents the user from hearing the invalid
content after each letter typed beyond initial 6 seconds, since
it is overwhelming to hear so many warnings.

The new implementation uses a debounce approach and instead will
communicate that an item is content invalid at any time, but at
most once per 3 seconds. This is closer to a "slow drip", which
will allow the user to always know the content is invalid, but
without so many utterances.

This new approach also shifts the code to Java and tracks only
the currently focused virtualViewId and the time index of the
most recent utterance, as opposed to the ElapsedTimer approach.
This eliminates all ElapsedTimer objects from the
browser_accessibility_android nodes.


AX-Relnotes: Throttled the frequency of invalid content warnings on Android.
Change-Id: I1232d70150b0eb6a68737bce9d51eb67834a5c1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354836
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798768}