DO NOT MERGE Let BackProgressAnimator could play cancel animation am: 056a4fcdc7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20876922

Change-Id: Ib2b90e8ab8debc9ad5c3def7012702a9c6ef5f87
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>