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When mounting SmbFs through cros-disks, there is currently no ability to
pass a file descriptor (eg. for a socket) over the D-Bus Mount() method.
Instead, a random string is generated and provided to SmbFs as part of
the mount source path. SmbFs will then generate a socket pair and pass
one end back to Chrome, along with the random string as an identifier,
through this D-Bus service.

This service is an exact duplicate of org.chromium.DriveFileStream.

Bug: 939235
Change-Id: Ideaec725a50ab7a1dba6e11b152fb08280c3a75b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890378Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Anand Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714124}