Add ArtDatumDeltaId field for time elapsed metric

This new metric will be useful to calculate frequency metrics,
e.g. how many full GC cycles happen per unit of time, which in
turn could be useful to measure the effectiveness of the CMC GC.

Bug: 294504711
Test: atest art_standalone_runtime_tests
Change-Id: I4d80296996e8ee099859a5b1c77c4874d5a91883
1 file changed
tree: f82a548777b7cce9e37df64a9b398d44ea097f08
  1. stats/
  2. OWNERS