This is the topaz counterpart to https://fuchsia-review.googlesource.com/c/fuchsia/+/277254. This is a backwards-incompatible ABI change that will be landed together with that CL. All clients have been migrated to be compatible with the new ABI. Change-Id: I07bb460ce3c6971eb671874db1f90e8c4906e656 Ported from Topaz tree.