Add initial VR interactive 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 95 matching lines @@
 
 #reload .button {
   background-image: url(../../../../ui/webui/resources/images/vr_reload.svg);
 }
 
 #forward .button {
   transform: scaleX(-1);
 }
 
 #reload-ui-button {
-  background-color: #555;
+  --tranX: 0;
+  --tranY: -1.2;
+  --tranZ: -1.2;
   color: white;
   font-size: 24px;
   padding: 12px;
 }
 
 #url-indicator-container {
   --tranX: 0;
   --tranY: -0.65;
   --tranZ: -1.2;
 }
@@ skipping 55 matching lines @@
   color: #252525;
   font-size: 34px;
   overflow: hidden;
   white-space: nowrap;
 }
 
 #url-indicator #path {
   color: #868686;
 }
 
+#omnibox-ui-element {
+  --tranX: 0;
+  --tranY: -0.2;
+  --tranZ: -1.0;
+  font-family: arial;
+}
+
+#omnibox-url-divider {
+  background-color: black;
+  height: 1px;
+}
+
+#omnibox-url-element {
+  background-color: white;
+  display: flex;
+  padding: 5px;
+  width: 100%;
+}
+
+.omnibox-suggestion {
+  background-color: white;
+  height: 22px;
+  overflow: hidden;
+  padding-left: 5px;
+  padding-right: 5px;
+  white-space: nowrap;
+  width: 100%;
+}
+
+#omnibox-input-field {
+  border: none;
+  font-size: 16px;
+  margin: 3px;
+  overflow: hidden;
+  padding: 0;
+  white-space: nowrap;
+  width: 280px;
+}
+
+#omnibox-clear-button {
+  background: url(../../../../ui/webui/resources/images/x-hover.png) no-repeat center center;
+  width: 15px;
+}