Auto merge of #11434 - catchmrbharath:status, r=nox

WIP: Fixes #11407: Implement Window.status

Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data:
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #11407 (github issue number if applicable).

Either:
- [x] There are tests for these changes OR
- [ ] These changes do not require tests because _____

Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process.

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components/script/dom/webidls/Window.webidl

@@ -20,7 +20,7 @@
   //[Replaceable] readonly attribute BarProp scrollbars;
   //[Replaceable] readonly attribute BarProp statusbar;
   //[Replaceable] readonly attribute BarProp toolbar;
-  //         attribute DOMString status;
+  attribute DOMString status;
   void close();
   //readonly attribute boolean closed;
   //void stop();

components/script/dom/window.rs

@@ -160,6 +160,7 @@ pub struct Window {
     screen: MutNullableHeap<JS<Screen>>,
     session_storage: MutNullableHeap<JS<Storage>>,
     local_storage: MutNullableHeap<JS<Storage>>,
+    status: DOMRefCell<DOMString>,
     #[ignore_heap_size_of = "channels are hard"]
     scheduler_chan: IpcSender<TimerEventRequest>,
     timers: OneshotTimers,
@@ -828,6 +829,16 @@ impl WindowMethods for Window {
         let dpr = self.window_size.get().map_or(1.0f32, |data| data.device_pixel_ratio.get());
         Finite::wrap(dpr as f64)
     }
+
+    // https://html.spec.whatwg.org/multipage/#dom-window-status
+    fn Status(&self) -> DOMString {
+        self.status.borrow().clone()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-window-status
+    fn SetStatus(&self, status: DOMString) {
+        *self.status.borrow_mut() = status
+    }
 }
 
 pub trait ScriptHelpers {
@@ -1513,6 +1524,7 @@ impl Window {
             screen: Default::default(),
             session_storage: Default::default(),
             local_storage: Default::default(),
+            status: DOMRefCell::new(DOMString::new()),
             scheduler_chan: scheduler_chan.clone(),
             timers: OneshotTimers::new(timer_event_chan, scheduler_chan),
             next_worker_id: Cell::new(WorkerId(0)),