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Holding space needs to support selection of multiple holding space items
to perform bulk context menu and drag/drop operations on them at a time.

This CL refactors HoldingSpaceItemContextMenu into a shared
HoldingSpaceItemViewDelegate to facilitate these requirements.

Note that this CL does not change any existing behavior, just lays the
groundwork for supporting multiple selection.

Bug: 1129981
Change-Id: If4da6c19ba01bd7104a1b1487350c362d7be1dd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419136
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809625}