Add a progress indicator to the VR omnibox

chrome/browser/resources/vr_shell/vr_shell_ui.css

 /* Copyright 2016 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. */
 
 html {
   background-color: rgba(255, 255, 255, 0);
 }
 
 #ui {
   left: 0;
@@ skipping 295 matching lines @@
   display: flex;
   height: 24px;
   overflow: hidden;
   white-space: nowrap;
 }
 
 .suggestion:hover {
   background-color: orange;
 }
 
-#omnibox-url-element {
+#omnibox-border {
+  --statusBarColor: rgb(66, 133, 244);
+  background-color: white;
+  border-radius: 8px;
+  padding: 3px;
+}
+
+#omnibox-contents {
   background-color: white;
   border-radius: 6px;
   box-sizing: border-box;
   display: flex;
   flex-direction: row-reverse; /* Right-justify for convienence. */
   height: 64px;
   margin-top: 2px;
   padding: 8px;
   transition: background-color 50ms ease-in-out;
 }
 
 #omnibox-input-field {
   background-color: transparent;
   border: none;
   font-size: 27px;
   outline: none; /* Do not show an outline when focused. */
   overflow: hidden;
   text-align: center;
   white-space: nowrap;
   width: 100%;
 }
 
 #omnibox-clear-button {
   background: url(../../../../ui/webui/resources/images/x-hover.png) no-repeat center center;
   width: 18px;
 }