Merge "Make sure move task to back is handled by shell" into udc-dev am: c2970d74 am: da67a78c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23269965



Change-Id: I2fd229a64e0bd3ef1c6a05de3a5e6de5504329d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>