Merge "Show task background surface" into tm-qpr-dev am: 7e8d76ad am: f3151b8c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19542257



Change-Id: I5f294a57025b109e4a78df243073565221fc71f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>