88d2f781f0
If the remote MTP device is backed by typical file system, the file name is unique among files in a directory. However, MTP protocol itself does not guarantee the uniqueness of name so we cannot use fullpath as ID. Instead of fullpath, we use artifical ID generated by MtpDatabase itself. So we don't need to store fullpath in the database. BUG=25162822 Change-Id: I06598ce631a3221ed72e11734dbdaefef4c6349c