Pause animators when app is not visible am: b99cc5b4 am: f2e66fa4

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



Change-Id: I2870bd1a50fe8539609280100c8001295f14cb25
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>