Merge "Add shadow to dream overlay home controls button." into udc-dev am:...

Merge "Add shadow to dream overlay home controls button." into udc-dev am: 3502d6ba am: 1ee48349 am: a40b9d8a am: dea49f15

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23146423



Change-Id: If4646046a3099103b6e40c5c139e0b010c54ad46
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>