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Previously the holding space tray would be visible in the shelf if the
user hadn't yet pinned anything or if the holding space was non-empty.

Now, the holding space tray will be hidden until the user first adds
something to their holding space. Once something has been added, the
tray will be visible until the user has pinned their first file. Once
they have pinned their first file, the holding space tray will only be
visible in the shelf if the holding space is non-empty.

Bug: 1138541
Change-Id: I6bb6dcdaae0699d9048f853a1e5b8afe48f21143
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533116
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826466}