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Rather than relying on the root of an isolated file system to determine
the scope of permission grants, explicitly expose the scope of
permission grants. This will make it easier to support special volumes
on Chrome OS.

Bug: 1093653
Change-Id: I17ef72864af6441a9f5f4392d537f7d7f7328cb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391384Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Auto-Submit: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804073}