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

chrome/browser/resources/chromeos/login/indeterminate-progress.js

+// Copyright (c) 2014 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.
+
+Polymer('indeterminate-progress', {
+  runnerPortion: 20,
+  rate: 1,
+  runnerColor: '#0f9d58',
+  backgroundColor: '#c8c8c8',
+
+  progress: 0,
+  min: Math.min,
+  max: Math.max,
+
+  computed: {
+    scaledProgress: '((100 + runnerPortion) * progress / 100) - runnerPortion',
+    primaryProgress: 'max(0, scaledProgress)',
+    secondaryProgress: 'min(scaledProgress + runnerPortion, 100)',
+    timeout: '20 / min(max(rate, 1), 10)'
+  },
+
+  ready: function() {
+    this.async(this.doProgress, null, this.timeout);
+  },
+
+  doProgress: function() {
+    if (this.progress + 1 > 100)
+      this.progress = 0;
+    else
+      ++this.progress;
+    this.async(this.doProgress, null, this.timeout);
+  }
+});