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This is a reland of 5ac617b2, which caused a MSan issue since TimeTrayItemView instance was destructed after the UnifiedSystemTrayModel instance in UnifiedSystemTray. This reland fix the order of destructions.

Original change's description:
> Scalable Status Area: Show date in status area in large screen.
>
> - Add a flag for the scalable status area feature.
> - Add enum and helper function in SystemTrayModel to capture system tray
> size.
> - Add date to system tray when the screen is large.
>
> Bug: 1161557
> Change-Id: Id85a6bee9a30684c65b2253862ba30ab78583525
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600912
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Reviewed-by: Toni Baržić <tbarzic@chromium.org>
> Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
> Commit-Queue: Andre Le <leandre@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#841227}

Bug: 1161557
Change-Id: I2894c68e6e59bef90c374dfe6d6c85ea74ef1850
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618445
Commit-Queue: Andre Le <leandre@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842460}