Merge "Add predictive back animation to Bouncer." into tm-qpr-dev am: a34b7aaf

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20835307



Change-Id: Iaa37960a289ecc3b24e6e14a4181fca9987413d0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>