Merge "Add alpha animation for 180 rotation" into rvc-dev am: 04e81462 am: ec46cc43 am: 1029f59f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12033206

Change-Id: If1e07bd56d20c57604f369891040324e7a70bdd1