Create OOBE screen for Waiting for Container ready

chrome/browser/resources/chromeos/login/oobe_wait_for_container_ready.js

+// Copyright 2017 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.
+
+/**
+ * @fileoverview Polymer element for displaying material design wait for
+ * container ready screen.
+ */
+
+Polymer({
+  is: 'wait-for-container-ready-md',
+
+  /**
+   * Returns element by its id.
+   */
+  getElement: function(id) {

[xiyuan, 2017/06/19 16:36:02]

We should try to avoid this kind of method on a polymer element. This exposes
the impl details and we should only use it as a last resort. And this particular
one seems not used.

[yueli, 2017/06/19 18:49:18]

Done.

+    return this.$[id];
+  }
+});