Pause animators when app is not visible am: b99cc5b4 am: 4551f51d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18528824



Change-Id: I1950e00e4cac979a360f6c5e49164c66a8d48933
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>