Start auto-generating the stats log API.

Both native and java bindings.

TODOs:
- Finish WorkSources.
- Clean up the package names for the protos.
- Put the protos in a more suitable location.

Test: stats-log-api-gen-test
Change-Id: Idf4022225e2be05106dbcf7de8e97a3337fc63e2
21 files changed