Add lock to protect UnwantedInteractionBlocker am: a91d8576d9 am: 49a167382e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/18494314

Change-Id: I852b3dd638c1fada8bf99a025cce40d58fd4bee6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>