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

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



Change-Id: Ib11a72256dd70b220dccd1b9749c77a4a0ffc886
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>