Separate VR omnibox and suggestion UI elements.

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 260 matching lines @@
   align-items: center; /* Vertically center text in div. */
   background-color: white;
   /* Use a transparent border to hide text overflow, but allow background to
    * color show through. */
   border-left: 5px solid transparent;
   border-right: 5px solid transparent;
   box-sizing: border-box;
   display: flex;
   height: 24px;
   overflow: hidden;
-  visibility: hidden;
   white-space: nowrap;
 }
 
 .suggestion:hover {
   background-color: orange;
 }
 
 #omnibox-url-element {
   background-color: white;
   border: 1px solid grey;
@@ skipping 10 matching lines @@
   outline: none; /* Do not show an outline when focused. */
   overflow: hidden;
   white-space: nowrap;
   width: 100%;
 }
 
 #omnibox-clear-button {
   background: url(../../../../ui/webui/resources/images/x-hover.png) no-repeat center center;
   width: 18px;
 }