Merge "Do not run background animation without a Looper" into sc-dev am: c359d54b am: 2b1f0f48

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15474611

Change-Id: Ie5b2079994f6a6729e3350f6f8e1362ffba7a274