Add CalendarView

This cl added the prototypes of the Calendar view.

Bug: 1236276

Change-Id: I865fa85b8a222b0e40b72bb43e7bb06a1cd94344
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3108549


Commit-Queue: Jiaming Cheng <jiamingc@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/main@{#918007}