Defined atoms for mms metrics. Bug: 233259583 Test: manual Change-Id: If35c10249040c085f02f457e09ecfc9da226c179 (cherry picked from commit b5d4b411fc8e7f471729e2e2b5ab39b9c1748a33) Merged-In: If35c10249040c085f02f457e09ecfc9da226c179