Revert "Revert "Add data transfer JobService APIs.""

This reverts commit 8e06f6988e75433215fd11ccba5ddd0879d46179.

Hides APIs based on feedback in other CL.

Reason for revert: Premature revert

Change-Id: I5eb50d85de5bae8713f11b27b42b62370e57f386
6 files changed