Merge "Upgrade rust/crates/protobuf to 2.22.0" am: 85383fa5ea am: 192dd08065 am: 4545dcdf9d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/protobuf/+/1582743

Change-Id: I5ae564029af783f2974169f7b3046660ae51f212
tree: 6c6459a06a2ce46fa3c2ad94d84fbe5d1be8200f
  1. benches/
  2. out/
  3. patches/
  4. src/
  5. .cargo_vcs_info.json
  6. Android.bp
  7. build.rs
  8. Cargo.toml
  9. Cargo.toml.orig
  10. LICENSE.txt
  11. METADATA
  12. MODULE_LICENSE_MIT
  13. OWNERS
  14. README.md
  15. regenerate.sh
README.md

How to develop rust-protobuf itself

cargo test --all to build everything.

If code generator is changed, code needs to be regenerated, see regenerate.sh.