DO NOT MERGE Only rely on developer option for back animation am: ab58191c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18310267



Change-Id: Ibf27183e26a5a8dca9f2856de7e84016ee6e0b29
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>