Merge "Adds launcher-side support for the SmartSpace shared element transition." into sc-dev am: bdb4ed711c am: 07bf81d6b1

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

Change-Id: Ib4867bd971b67da411ad0bc6227fc7edee627176