Add an initial omnibox to HTML UI content.

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 {
+  --scaleFactor: 4;
+  left: 0;
+  position: absolute;
+  top: 0;
+  transform: scale(0.25, 0.25);
+}
+
 .webvr-message-box {
   align-items: center;
   display: flex;
   flex-direction: column;
   justify-content: center;
   position: absolute;
 }
 
 /* Permanent security warning for WebVR. This uses a fixed-size absolutely
  * positioned DIV, the rectangle must match kWebVrWarningPermanentRect
@@ skipping 130 matching lines @@
   color: white;
   font-size: 16;
   height: 24px;
   left: 610px;
   opacity: 1;
   position: absolute;
   text-align: center;
   top: 0;
   width: 96px;
 }
+
+#omni {
+  --tranX: 0;
+  --tranY: -0.5;
+  --tranZ: -1.0;
+  background-color: rgba(255, 255, 255, 0.9);
+  border-radius: 100px;
+  box-sizing: border-box;
+  height: 104px;
+  left: 0;
+  opacity: 1;
+  position: absolute;
+  top: 402px;
+  transition: opacity 250ms ease, margin-top 250ms ease;
+  white-space: nowrap;
+  width: 504px;
+}
+
+#omni #connection-security {
+  left: 35px;
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+}
+
+#omni #url {
+  color: #252525;
+  font-size: 34px;
+  left: 80px;
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+  white-space: nowrap;
+}
+
+#omni #path {
+  color: #868686;
+}
+
+#omni.hide {
+  margin-top: 60px;
+  opacity: 0;
+}
+
+#omni.loading {
+  border: 4px solid rgb(86, 203, 255);
+}
+
+#omni.idle {
+  background-color: #ECECEC;
+  box-shadow: 0 2px 24px 0 rgba(0, 0, 0, 0.1);
+}
+
+#omni.idle #domain {
+  color: black;
+}