Merge "[Motion] Split-shade expansion: implement over scroll effect [v1]" into tm-dev am: fa9d138b am: eb4b3713 am: bd0ec6af

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17859843



Change-Id: I9e79d6e35f31b587d01c9aef58bbda1a391310ba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>