Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/elements/elementsPanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 321 matching lines @@
     list-style: none;
 }
 
 .styles-section .style-properties ol.expanded {
     display: block;
 }
 
 .styles-section.matched-styles .style-properties li.parent .expand-element {
     -webkit-user-select: none;
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 144px;
+    background-size: 352px 168px;
     margin-right: 2px;
     margin-left: -6px;
     opacity: 0.55;
     width: 8px;
     height: 10px;
     display: inline-block;
 }
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
 .styles-section.matched-styles .style-properties li.parent .expand-element {
@@ skipping 373 matching lines @@
 
 .style-properties li.editing-sub-part {
     padding: 3px 6px 8px 18px;
     margin: -1px -6px -8px -6px;
     text-overflow: clip;
 }
 
 .properties-widget-section {
     padding: 2px 0px 2px 5px;
 }