Merge "Improve drag divider dismiss transition." into udc-dev am: 41464c2f am: c71f191f

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



Change-Id: Id800c5fdaed41c0b22fd4b4f86445522e2164a1a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>