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

PR Close #30962

packages/zone.js/lib/browser/custom-elements.ts

@@ -0,0 +1,19 @@
+/**
+ * @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
+ */
+
+export function patchCustomElements(_global: any, api: _ZonePrivate) {
+  const {isBrowser, isMix} = api.getGlobalObjects() !;
+  if ((!isBrowser && !isMix) || !_global['customElements'] || !('customElements' in _global)) {
+    return;
+  }
+
+  const callbacks =
+      ['connectedCallback', 'disconnectedCallback', 'adoptedCallback', 'attributeChangedCallback'];
+
+  api.patchCallbacks(api, _global.customElements, 'customElements', 'define', callbacks);
+}