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This change assigns the proper ARIA roles and attributes to the time
picker popup to ensure a good experience with screen readers.  Prior to
this change the hour/minute/AM-PM columns were read as monolithic chunks
of numbers and the individual values were not selectable.  Now the
columns and cells have the proper ARIA roles, labels, and selection
management so that the popup works smoothly with a screen reader.

Bug: 1026544
Change-Id: Ifb16eceed8c4211537aee46cd4d09f771fea8635
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088553Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Ionel Popescu <iopopesc@microsoft.com>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Dan Clark <daniec@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#752609}