cros-disks: add constant for IsAutoMountable property

BUG=None
TEST=Remote trybot runs.

Change-Id: I6b79fffd6b5f0dd0f1cf1035af0823aefb487c98
Reviewed-on: https://chromium-review.googlesource.com/1152535
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Anand Mistry <amistry@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed