Daichi Hirono 81d48536ae Show MTP device as root when it has multiple/zero storages.
The CL updates MtpDocumentsProvider#queryRoots so that it fetches
devices from Database as well as storages when we don't have storages
under the device, or when we have multiple storages under the device.

BUG=26120019
Change-Id: Id2b140f00a1d49fa4da7e17d2564dbbaa1795e1e
2015-12-18 14:12:35 +09:00
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