Import mobile-data-download code to AOSP. am: 5925581724 am: f359c08901

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

Change-Id: I0ed33cee7a6b413b4481e7ee05d4f01749016ac3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>