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For DriveFS, most operations are handled as native file operations.
However, some operations require special-casing; for those we need a
custom filesystem implementation to override those implementations.

Bug: 874314
Change-Id: I91fffdfb260d6dc53241eed13b734f2df8354f8a
Reviewed-on: https://chromium-review.googlesource.com/1180829
Commit-Queue: Sam McNally <sammc@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584626}