Merge "New flag for lockscreen jank fix" into udc-dev am: 466273bb

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23540641



Change-Id: I24741c3086686070f9c0bc1e160f600a054730bc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>