Assign names to VR UI elements for debugging and test.

chrome/browser/resources/vr_shell/vr_shell_ui_api.js

 // 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.
 
 var api = {};
 
 /**
  * Enumeration of scene update commands.
  * @enum {number}
  * @const
@@ skipping 196 matching lines @@
 
   /**
    * Set the id of the element to update.
    * @param {number} id
    */
   setId(id) {
     this.properties['id'] = id;
   }
 
   /**
+   * Set the name of the element. This name is used for debug and testing.
+   * @param {string} name
+   */
+  setName(name) {
+    this.properties['name'] = name;
+  }
+
+  /**
    * Specify a parent for this element. If set, this element is positioned
    * relative to its parent element, rather than absolutely. This allows
    * elements to automatically move with a parent.
    * @param {number} id
    */
   setParentId(id) {
     this.properties['parentId'] = id;
   }
 
   /**
@@ skipping 525 matching lines @@
     if ('removeTab' in dict) {
       this.onRemoveTab(dict['removeTab']);
     }
     if ('canGoBack' in dict) {
       this.onSetHistoryButtonsEnabled(dict['canGoBack'], dict['canGoForward']);
     }
 
     this.onCommandHandlerFinished()
   }
 };