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Refactor the time view to use two subviews to manage different layouts.
This will allow us to remove the usage of set_owned_by_client() since
all the labels will always owned by the views hierarchy. In addition,
this will simplify the process of updating layouts and re-layout.

BUG=1044687

Change-Id: I234fd2315d73d2508dc60f3544a04a12fbd170d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2211085Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772340}