Merge "Adds launcher-side support for the SmartSpace shared element transition." into sc-dev am: bdb4ed711c am: b7735b450e am: 1c6c49e63a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14471950

Change-Id: I824a6af154a96514c29f13eb34ddb966ba07560b