wayland: implement commit-timing-v1

src/ifs/wl_output.rs

@@ -60,6 +60,7 @@ pub struct WlOutputGlobal {
     pub pos: Cell<Rect>,
     pub output_id: Rc<OutputId>,
     pub mode: Cell<backend::Mode>,
+    pub refresh_nsec: Cell<u64>,
     pub modes: Vec<backend::Mode>,
     pub formats: CloneCell<Rc<Vec<&'static Format>>>,
     pub format: Cell<&'static Format>,
@@ -157,6 +158,7 @@ impl WlOutputGlobal {
             pos: Cell::new(Rect::new_sized(x, y, width, height).unwrap()),
             output_id: output_id.clone(),
             mode: Cell::new(*mode),
+            refresh_nsec: Cell::new(mode.refresh_nsec()),
             modes,
             formats: CloneCell::new(Rc::new(vec![])),
             format: Cell::new(XRGB8888),