Update the screen-orientation IDL + tests (#11899)

interfaces/screen-orientation.idl

@@ -4,30 +4,32 @@
 // See: https://w3c.github.io/screen-orientation/
 
 partial interface Screen {
-    [SameObject]
-    readonly attribute ScreenOrientation orientation;
+  [SameObject] readonly attribute ScreenOrientation orientation;
 };
+
 [Exposed=Window]
 interface ScreenOrientation : EventTarget {
-    Promise<void> lock(OrientationLockType orientation);
-    void          unlock();
-    readonly attribute OrientationType type;
-    readonly attribute unsigned short  angle;
-             attribute EventHandler    onchange;
+  Promise<void> lock(OrientationLockType orientation);
+  void unlock();
+  readonly attribute OrientationType type;
+  readonly attribute unsigned short angle;
+  attribute EventHandler onchange;
 };
+
 enum OrientationType {
-    "portrait-primary",
-    "portrait-secondary",
-    "landscape-primary",
-    "landscape-secondary"
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary"
 };
+
 enum OrientationLockType {
-    "any",
-    "natural",
-    "landscape",
-    "portrait",
-    "portrait-primary",
-    "portrait-secondary",
-    "landscape-primary",
-    "landscape-secondary"
+  "any",
+  "natural",
+  "landscape",
+  "portrait",
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary"
 };

screen-orientation/idlharness.window.js

@@ -0,0 +1,18 @@
+// META: script=/resources/WebIDLParser.js
+// META: script=/resources/idlharness.js
+
+'use strict';
+
+// https://w3c.github.io/screen-orientation/
+
+idl_test(
+  ['screen-orientation'],
+  ['dom', 'cssom-view', 'html'],
+  idl_array => {
+    idl_array.add_objects({
+      Screen: ['screen'],
+      ScreenOrientation: ['screen.orientation']
+    });
+  },
+  'Test IDL implementation of Screen Orientation API'
+);