Add event metrics for latency of sandbox APIs

This adds a config for logging the latency of APIs that will be called
from app to the sandbox (cl/476933383)

Bug: b/243033947

Test: Flashed the build with config changes and the event metrics were
getting collected.

Change-Id: Id43361dc3b826ad16902a1c9dfd5133954675d52
2 files changed
tree: 8744c370d359f0257b1e7fbcb79b8135f8ed806b
  1. build/
  2. docs/
  3. emu_test/
  4. libraries/
  5. scripts/
  6. tests/
  7. utils/
  8. PREUPLOAD.cfg