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SearchMetadata is used to query for recents and file system searches.

There are a number of folders under <drive> that are hidden by default,
and to be searched needed to be whitelisted. This adds team_drives to
the whitelist and adds unit tests to verify that team drives results
are returned in searches.

Bug: 866575
Change-Id: I583ba06672f3d6a8112680ff22124b65048b74a7
Reviewed-on: https://chromium-review.googlesource.com/1149669Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578527}