Get taffy style conversion working

crates/gpui/playground/src/frame.rs

@@ -1 +1,34 @@
+use crate::{element::Element, style::Style};
 
+pub struct Frame {
+    style: Style,
+    children: Vec<Frame>,
+}
+
+impl<V: 'static> Element<V> for Frame {
+    fn style_mut(&mut self) -> &mut Style {
+        &mut self.style
+    }
+
+    fn layout(&mut self, view: &mut V, cx: &mut gpui::LayoutContext<V>) -> taffy::tree::NodeId {
+        let child_layout_node_ids = self
+            .children
+            .iter_mut()
+            .map(|child| child.layout(view, cx))
+            .collect::<Vec<_>>();
+
+        let rem_size = cx.rem_pixels();
+        cx.layout_engine()
+            .new_with_children(self.style.to_taffy(rem_size), &child_layout_node_ids)
+            .unwrap()
+    }
+
+    fn paint(
+        &mut self,
+        layout: &taffy::tree::Layout,
+        view: &mut V,
+        cx: &mut gpui::PaintContext<V>,
+    ) {
+        todo!()
+    }
+}