Merge "Add support for swiping back to the shortcut that launched the activity" into sc-dev am: b837f5040e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14149776

Change-Id: I5f483a23c6c9fb278df781f9b5bfc0fcb6a5ee2f