Merge "Send divider change to launcher to animate" into udc-dev am: 322d6946 am: 0115f9f8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22538104



Change-Id: I42e090d8e7512324fe0b836a83408530eab7d707
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>