Silently apply updates instead of asking user to confirm

frontend/platform/ServiceWorkerHandler.ts

@@ -1,11 +1,40 @@
 import { ServiceWorkerHandler as BaseHandler } from "hydrogen-web/src/platform/web/dom/ServiceWorkerHandler.js";
 
 export class ServiceWorkerHandler extends BaseHandler {
+    private get registration() {
+        return super.getRegistration();
+    }
+
     public registerAndStart(path: string) {
         super.registerAndStart(path);
     }
 
     public async preventConcurrentSessionAccess(sessionId: string) {
-        return super._sendAndWaitForReply("closeSession", { sessionId });
+        return this._sendAndWaitForReply("closeSession", { sessionId });
+    }
+
+    async _proposeUpdate() {
+        if (document.hidden) {
+            return;
+        }
+
+        const version = await this._sendAndWaitForReply("version", null, this.registration.waiting);
+
+        // Prevent any fetch requests from going to the service worker from any client,
+        // so that it's not kept active when calling skipWaiting on the new one.
+        await this._sendAndWaitForReply("haltRequests", null);
+
+        console.log(`Updating to version ${version.version} (${version.buildHash})`);
+
+        // Once all requests are blocked, ask the new service worker to skipWaiting.
+        return this._send("skipWaiting", null, this.registration.waiting);
+    }
+
+    async _sendAndWaitForReply(type, payload: {}|null, worker = undefined) {
+        return super._sendAndWaitForReply(type, payload, worker);
+    }
+
+    async _send(type, payload, worker = undefined) {
+        return super._send(type, payload, worker);
     }
 }