Daichi Hirono 50d17aa871 Implement queryRoot method of MtpDocumentsProvider.
BUG=20274999

Change-Id: I27aa8bffe47eab6ea1f4195023dbacb6e2f76548
2015-07-29 14:38:11 +09:00
..
2015-07-28 12:49:11 +09:00
2015-07-28 14:30:07 +09:00