Merge "Reduce unnecessary operations in the setFocusedTask" into udc-dev am: 67e0a033

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22304469



Change-Id: I3d7e3bf5e1f4e6c0f1df4be85425dcb38b7141f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>