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Define a new item type for files added to the holding space via nearby
sharing functionality.

Nearby shared files will be shown in the downloads section of the
holding space and will be persisted.

Bug: 1130625
Change-Id: I6da1da172a7de5e4f3ae3c321434376ffc80a38f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450053Reviewed-by: David Black <dmblack@google.com>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814909}