1 files changed, 19 insertions, 0 deletions
diff --git a/chromium/chrome/browser/resources/tab_strip/alert_indicator.js b/chromium/chrome/browser/resources/tab_strip/alert_indicator.js
new file mode 100644
index 00000000000..2d41eab42f6
--- /dev/null
+++ b/chromium/chrome/browser/resources/tab_strip/alert_indicator.js
@@ -0,0 +1,19 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import {CustomElement} from './custom_element.js';
+
+export class AlertIndicatorElement extends CustomElement {
+  static get template() {
+    return `{__html_template__}`;
+  }
+
+  /** @override */
+  remove() {
+    this.toggleAttribute('fade-out', true);
+    this.addEventListener('animationend', () => super.remove(), {once: true});
+  }
+}
+
+customElements.define('tabstrip-alert-indicator', AlertIndicatorElement);