Fill back missing upstream published files. am: cb47e1cb1d am: de85e32b72 am: 4e46524a04 am: dbb569cee8

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand/+/1443105

Change-Id: I808b44783a315d2e7c627969cf925e302ca9dbe4