Merge "Add alpha animation for 180 rotation" into rvc-dev am: 04e81462ce am: ec46cc4326 am: 6647300f89

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

Change-Id: Ib8c14d89e6c77c5aebc00fb9d288854f2ad2e1fe