Import mobile-data-download code to AOSP. am: 5925581724 am: f359c08901 am: 4906ba1a69 am: f3e29483df

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

Change-Id: I64f02cf511659e74b9445776cc90a832aa54221d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>