Initial import of bencher v0.1.5 am: d036b627b0 am: 0d26d433f1 am: 3498911734

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/bencher/+/1533314

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Id4a89c410a052d2447b76d5d2ff414acc5510999