Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/emulation/overrides.css

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 211 matching lines @@
 
 .overrides-view .overrides-footer {
     flex: none;
     padding: 0 0 1px 3px;
     border-top: 1px solid rgb(203,203,203);
     background-color: #eee;
 }
 
 .overrides-view .overrides-footer::before {
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 144px;
+    background-size: 352px 168px;
     width: 10px;
     height: 10px;
     content: "";
     position: relative;
     top: 2px;
     background-position: -202px -107px;
     float: left;
     margin-right: 4px;
 }
 
@@ skipping 22 matching lines @@
 #overrides-reset-button,
 #overrides-disable-button {
     margin: 9px 0 0 17px;
     display: block;
     width: 60px;
 }
 
 .overrides-enable-button {
     margin: 4px !important;
 }