Merge "Move notification shade changes into GX Overlay." into sc-dev am: 69ed0779b4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13418388

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7e6397b58431e276c809a6b63b9258929c52c9bb