Merge "Skip null surface when validating transition" into udc-dev am: 4bc363b9 am: 7c00959e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23765883



Change-Id: I99ddfda8a6a26e68c61eda44d0deb09c729d3aed
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>