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

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



Change-Id: Iaf26a736e3692208fe4a75c6c8c07e9f4ba021f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>