Merge commit '9af0b4f7be14f2b3ed0ecc843c57ea47ec288e55' * commit '9af0b4f7be14f2b3ed0ecc843c57ea47ec288e55': Add new listener to GestureOverlayView. This listener fires whenever the overlay thinks the user is starting a new gesture. This allows Home to snap the workspace back to its original position during a gesture operation.