Implemented UI for the meetings controller out-of-box.

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

Index: chrome/browser/resources/chromeos/login/custom_elements.js
diff --git a/ui/native_theme/native_theme_observer.cc b/chrome/browser/resources/chromeos/login/custom_elements.js
similarity index 55%
copy from ui/native_theme/native_theme_observer.cc
copy to chrome/browser/resources/chromeos/login/custom_elements.js
index f516a762027fccab32d569f2466d82c65252c104..fcf0be4a95952f067de5b36805e97d7b672c2b6c 100644
--- a/ui/native_theme/native_theme_observer.cc
+++ b/chrome/browser/resources/chromeos/login/custom_elements.js
@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/native_theme/native_theme_observer.h"
-
-namespace ui {
-
-NativeThemeObserver::~NativeThemeObserver() {}
-
-}  // namespace ui
+<include src="oobe-screen.js">
+<include src="html-echo.js">
+<include src="indeterminate-progress.js">