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* New fileManagerPrivate APIs:
 - isCrostiniEnabled: returns true if device supports crostini
   and termina/penguin container exists.  This function is
   controlled by flag 'crostini-files'.
 - mountCrostiniContainer: starts and mounts container.

* Created new root type NavigationModelSFTPMountItem which uses
  a FakeEntry, similar to 'Recent', to show the 'Linux Files' root.

* Click handler for Linux Files will start and mount crostini container.

* Code in NavigationModel to order roots detects when mounted
  volumes already contains an FSP-provided mount for
  fileSystemId='crostini'.  In this case, the fake root is left out
  and the real volume should be in the same position.

* Error handling code for SFTP mount/disconnect to be implemented
  when sshfs is available.

Bug: 834103
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I8a3bec948871dc9671ea513d7378035d89d565eb
Reviewed-on: https://chromium-review.googlesource.com/1025545
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557104}