[Expand metrics for Autofill] : Add AutofillProvider & IME provider

Part 1: Includes adding logs for autofill provider and ime provider,
apart from minor other changes.
Follow-up CL would include Autofill Commit Reason,
and latency metrics (TBD: if needed here)

BUG: 234185326
Test: NA, just atom's field added
Change-Id: Ibf151d7df1ad5079466b34a308c30243c1631a96
1 file changed
tree: 1226afc2f55da37df418b4ad135b8bff53cf879c
  1. stats/
  2. OWNERS