Backfill atom tests for new event metric format

Bug: 210548081
Bug: 211343690
Test: TextClassifierServiceTest
Change-Id: Ibd1c2ff0d4a1b2ec4f81c99330baa7cbe1ff370f
Merged-In: Ibd1c2ff0d4a1b2ec4f81c99330baa7cbe1ff370f
1 file changed