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Android uses somewhat different date/time pickers. They look like spinners.
The first bug was that they didn't expose their accessible name and value.
Fixed by whitelisting those roles as roles that need to expose a value on
Android, and added test coverage.

The second bug was that the value wasn't being updated. This change adds a
call to fire a ValueChanged event to the right Blink code.

Bug: 998119, 998121
Change-Id: Ibee5778c3afc532bdd145eeb7d5f4646287fc383
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790466
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Keishi Hattori <keishi@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694917}