Merge "Fix split-tasks & wallpaper flicker when unlocking keyguard" into udc-dev am: 235c3fa7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23297242



Change-Id: I957c6374112b27640465b2b610cf81dc2711a5ae
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>