Enable item clipping on normal transform layers. Fixes rounded corners on layers with 2d transforms.

Needed for #6643.

components/gfx/display_list/mod.rs

@@ -1033,13 +1033,11 @@ impl<'a> Iterator for DisplayItemIterator<'a> {
 impl DisplayItem {
     /// Paints this display item into the given painting context.
     fn draw_into_context(&self, paint_context: &mut PaintContext) {
-        if paint_context.layer_kind == LayerKind::NoTransform {
         let this_clip = &self.base().clip;
         match paint_context.transient_clip {
             Some(ref transient_clip) if transient_clip == this_clip => {}
             Some(_) | None => paint_context.push_transient_clip((*this_clip).clone()),
         }
-        }
 
         match *self {
             DisplayItem::SolidColorClass(ref solid_color) => {