[automerger skipped] Add developer option for back animation DO NOT MERGE am: 94f506aa am: d67d6753 am: d6518e5a am: 1a0c6048 -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17619727



Change-Id: I7c0d3085830285969236c3a1ae93638e10865f6c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>