Register OnAttachStateChangeListener before attaching to container. am: 503f04f86d am: a62d85752e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/24681979

Change-Id: I18e1ee9b5c46affdf90f3fbbb9327db4bbe178e2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>