Support css class selection (2)

select.rs

@@ -89,6 +89,7 @@ pub trait SelectHandler<N> {
     fn with_node_id<R>(&self, node: &N, f: &fn(Option<&str>) -> R) -> R;
     fn named_parent_node(&self, node: &N, name: &str) -> Option<N>;
     fn parent_node(&self, node: &N) -> Option<N>;
+    fn node_has_class(&self, node: &N, &str) -> bool;
     fn node_has_id(&self, node: &N, &str) -> bool;
     fn named_ancestor_node(&self, node: &N, name: &str) -> Option<N>;
     fn node_is_root(&self, node: &N) -> bool;
@@ -142,6 +143,10 @@ impl<N, H: SelectHandler<N>> n::s::CssSelectHandler<N> for SelectHandlerWrapper<
         self.inner_ref().parent_node(node)
     }
 
+    fn node_has_class(&self, node: &N, name: LwcString) -> bool {
+        self.inner_ref().node_has_class(node, name.to_str_slice())
+    }
+
     fn node_has_id(&self, node: &N, name: LwcString) -> bool {
         self.inner_ref().node_has_id(node, name.to_str_slice())
     }