Merge "[pm/metrics] add loadingCompletedTime in stats" into udc-dev am: aede9255 am: d228e77b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21893930



Change-Id: Idbe5658251dbbf88de10fe96036d161c01e88748
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>