Add annotation ids to StatsLog as @SystemApi.

Prior to this change, the annotation ids are hardcoded at statsd's
clients. Make them SystemApi so all clients can share these constants
living inside statsd apex.

Bug: 160938178
Test: m
Change-Id: I99d7d8659a6695ffdc73d6e69ad535c374ef735a
2 files changed
tree: 08d747cfb67c8c06bf11be6afcb5d7e153c85422
  1. aidl/
  2. apex/
  3. bin/
  4. framework/
  5. lib/
  6. service/
  7. tests/
  8. .gitignore
  9. PREUPLOAD.cfg