Add Prioritized Task Scheduling (worth prototyping)

Closes mozilla#546.

activities.json

@@ -891,6 +891,18 @@
     "title": "Portals",
     "url": "https://wicg.github.io/portals/"
   },
+  {
+    "ciuName": null,
+    "description": "This specification defines APIs for scheduling and controlling prioritized tasks.",
+    "id": "scheduling-api",
+    "mozBugUrl": "https://bugzilla.mozilla.org/show_bug.cgi?id=1734997",
+    "mozPosition": "worth prototyping",
+    "mozPositionDetail": "This feature is useful for web developers to provide a more responsive experience to users.",
+    "mozPositionIssue": 546,
+    "org": "Proposal",
+    "title": "Prioritized Task Scheduling",
+    "url": "https://wicg.github.io/scheduling-apis/"
+  },
   {
     "ciuName": null,
     "description": "This specification defines a privacy preserving way to attribute a conversion, such as a purchase or a sign-up, to a previous ad click.",