Ash Tray: Update status area collapse state when state changes.
The collapse state of the status area should be updated when the shelf state or bounds change or when a tray item is shown or hidden. Note that the actual calculation for which trays should be hidden or visible is unimplemented and will be finished in a future CL. TEST=unit test BUG=982511 Change-Id: Ie4a46be7d03435bf8927062af0c7726f5cc090a3 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904165 Commit-Queue: Tim Song <tengs@chromium.org> Reviewed-by:Tetsui Ohkubo <tetsui@chromium.org> Reviewed-by:
Xiyuan Xia <xiyuan@chromium.org> Cr-Commit-Position: refs/heads/master@{#714798}
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