Merge "[pm/metrics] add loadingCompletedTime in stats" into udc-dev am: aede9255 am: 57c352e2

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



Change-Id: I910e38c2bf6a8d51e8dc2f43bcb646b3be035114
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>