[automerger skipped] Add new metrics to report averages as sum and count am: 47ab0f4d25 -s ours

am skip reason: Merged-In I88741e38b5e9fa784efa57cc9ef079dd7ee4c447 with SHA-1 0a3b31c925 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/art/+/19457560

Change-Id: I4c266ccbdf2d2888b608be6c417ed61ac5113b6a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>