Merge "Add launch assistant method." into tm-qpr-dev am: 0b448547

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/19822904



Change-Id: I3770f6e904abf8507e47b62470540eb0e102ca3e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>