Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/ui/propertiesSection.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.
  */
 
 .properties-tree {
     margin: 0;
     padding: 0 6px 2px;
     list-style: none;
@@ skipping 22 matching lines @@
     line-height: 12px;
 }
 
 .properties-tree li.parent {
     margin-left: 1px;
 }
 
 .properties-tree li.parent::before {
     -webkit-user-select: none;
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 144px;
+    background-size: 352px 168px;
     opacity: 0.5;
     content: "a";
     width: 8px;
     float: left;
     margin-right: 4px;
     color: transparent;
     text-shadow: none;
 }
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
@@ skipping 47 matching lines @@
     color: blue;
 }
 
 .properties-tree .keyword {
     color: rgb(136, 19, 79);
 }
 
 .properties-tree .color {
     color: rgb(118, 15, 21);
 }