Merge "Add pre-threshold fling vibration for Back gesture" into udc-qpr-dev am: 0b9abd87

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25224776



Change-Id: Ie2af87b93c53b0a812bb192666c01c0181eb9a04
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>