Merge "Fix SystemUI crash from continues launch task with setLaunchRootTask"...

Merge "Fix SystemUI crash from continues launch task with setLaunchRootTask" into udc-dev am: 61730e62 am: 74594fb3 am: 030049aa

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23577584



Change-Id: I88ea77beee64674b9d12c8623d3a479e9ff8358a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>