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- 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/+/2600912Reviewed-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}