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: I1140c3d33cc6c8217ba7ffe595ca4b20827c0931
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>