Merge "Improve drag divider dismiss transition." into udc-dev am: 41464c2f am: 33b770c3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23345341



Change-Id: I6478e014e4f7f202fae1e5d76546ecee777e798f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>