Import mobile-data-download code to AOSP. am: 5925581724

Original change: https://android-review.googlesource.com/c/platform/external/mobile-data-download/+/2134626

Change-Id: I4695a44439ccc7666fde927cd744cf2ccb8cb1a5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>