build: move zone.js to angular repo (#30962)

PR Close #30962

packages/zone.js/test/zone_worker_entry_point.ts

@@ -0,0 +1,31 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+// Setup tests for Zone without microtask support
+System.config({defaultJSExtensions: true});
+System.import('../lib/browser/api-util').then(() => {
+  System.import('../lib/browser/browser-legacy').then(() => {
+    System.import('../lib/browser/browser').then(() => {
+      const _global = typeof window !== 'undefined' ? window : self;
+      Zone.current.fork({name: 'webworker'}).run(() => {
+        const websocket = new WebSocket('ws://localhost:8001');
+        websocket.addEventListener('open', () => {
+          websocket.onmessage = () => {
+            if ((<any>self).Zone.current.name === 'webworker') {
+              (<any>self).postMessage('pass');
+            } else {
+              (<any>self).postMessage('fail');
+            }
+            websocket.close();
+          };
+          websocket.send('text');
+        });
+      });
+    }, (e: any) => (<any>self).postMessage(`error ${e.message}`));
+  });
+});