Merge "[sf] only update the last latch time if the layer has a buffer" into udc-dev am: ba87aa7f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/21683988



Change-Id: Iefa83ab5c183dc7fc1dbe82edf22f9105339e23c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>