create scafolding for the shadow dom

packages/native-core/src/passes.rs

@@ -104,6 +104,9 @@ pub trait State<V: FromAnyValue + Send + Sync = ()>: Any + Send + Sync {
     /// This is a mask of what aspects of the node are required to update this state
     const NODE_MASK: NodeMaskBuilder<'static>;
 
+    /// Does the state traverse into the shadow dom?
+    const TRAVERSE_SHADOW_DOM: bool = false;
+
     /// Update this state in a node, returns if the state was updated
     fn update<'a>(
         &mut self,