Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/network/xmlView.css

 /*
  * Copyright (c) 2014 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.
  */
 
 .shadow-xml-view {
     -webkit-user-select: text;
     overflow: auto;
     padding: 2px 4px;
@@ skipping 10 matching lines @@
     -webkit-padding-start: 0;
 }
 
 .shadow-xml-view ol.children:not(.expanded) {
     display: none;
 }
 
 .shadow-xml-view li.parent::before {
     -webkit-user-select: none;
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
-    -webkit-mask-size: 352px 144px;
+    -webkit-mask-size: 352px 168px;
     -webkit-mask-position: -4px -97px;
     background-color: rgb(110, 110, 110);
     content: " ";
     width: 10px;/* arrow width */
     height: 10px;
     display: inline-block;
     position: relative;
     top: 2px;
 }
 
@@ skipping 36 matching lines @@
 }
 
 .shadow-xml-view-text {
     color: rgb(0, 0, 0);
     white-space: pre;
 }
 
 .shadow-xml-view-cdata {
     color: rgb(0, 0, 0);
 }