Function compute_damage_and_rebuild_box_tree 

pub(crate) fn compute_damage_and_rebuild_box_tree<'dom>(
    box_tree: &mut Option<Arc<BoxTree>>,
    layout_context: &LayoutContext<'_>,
    dirty_root: ServoLayoutNode<'dom>,
    root_node: ServoLayoutNode<'dom>,
    damage_from_environment: LayoutDamage,
    layout_roots: &mut Vec<LayoutRoot<'dom>>,
) -> LayoutDamage