root/sync/internal_api/events/

[..]
  1. commit_request_event.cc
  2. commit_response_event.cc
  3. configure_get_updates_request_event.cc
  4. get_updates_response_event.cc
  5. normal_get_updates_request_event.cc
  6. poll_get_updates_request_event.cc
  7. protocol_event.cc
[..]