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This change makes it possible for users to select a date/time range. The UI ensures that the range is non-empty and valid, i.e., that the end of the range is after the start of the range. For now, this uses the stock android DateTimePicker in a popup dialog.

Adjusting the start of the range to after the end of the range will automatically clamp the end of the range to the new start value, and vice-versa. A short demo video is in the bug linked below.

Bug: b/139121989
Change-Id: I0c99db66ea1350e81a3aba1246602f7aab8fce4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803437
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698480}