Add metadata files am: 25d365d3d5 am: 558d3b67d4 am: 722cf8c6bf am: 03fa2ef8c9

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand_core/+/1357964

Change-Id: I85f92a3d6ca00e356e3845f981758d0a1bf62886