This crate is effectively a collection of stubs in this repo,
but will allow a downstream repo to implement those stubs.
BUG=b:213152497
FIXED=b:213152497
TEST=build + kokoro
Change-Id: I3c544644ec3d7917f9ebb2e8621042c35b556db8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3622799
Reviewed-by: Noah Gold <nkgold@google.com>
Commit-Queue: Michael Hoyle <mikehoyle@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
