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Also add a host encapsulation class, and a helper class for performing
the actual mount operation.

Bug: 939235
Change-Id: I2e8af1c88fe59d190d41b31d8b7060be6fdb0e08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1923868
Commit-Queue: Anand Mistry <amistry@chromium.org>
Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#722378}