Merge "Do not run background animation without a Looper" into sc-dev am: c359d54b am: 2b1f0f48 am: 089a67d0

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

Change-Id: Ic03b6bad3755f26cbc9a2278303d99f789962dc5