Merge "Add per-file OWNERS for ChargeCalculators" am: e191d88136 am: 7526d5687c am: 77229abe61

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1621724

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I3cfbb9ce3f4257cc676d24bcd0cb71b07279e56b