Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/emulation/devicesSettingsTab.css

 /*
  * Copyright 2015 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.
  */
 
 .devices-settings-tab .settings-tab.help-content {
     display: flex;
     flex-direction: column;
     align-items: flex-start;
@@ skipping 60 matching lines @@
     color: #aaa;
 }
 
 .devices-settings-tab .device-list-item-show .devices-list-title {
     color: #222;
 }
 
 .devices-settings-tab .devices-list-remove,
 .devices-settings-tab .devices-list-edit {
     background-image: url(Images/toolbarButtonGlyphs.png);
-    background-size: 352px 144px;
+    background-size: 352px 168px;
     width: 32px;
     height: 24px;
     opacity: 0.5;
     cursor: pointer;
     flex: none;
     visibility: hidden;
 }
 
 .devices-settings-tab .devices-list:not(.devices-list-editing) .devices-list-item:hover .devices-list-remove,
 .devices-settings-tab .devices-list-item:hover .devices-list-edit {
@@ skipping 55 matching lines @@
 
 .devices-settings-tab .devices-edit-fields > * {
     flex: none;
     margin-bottom: 10px;
 }
 
 .devices-settings-tab .devices-edit-buttons > button {
     margin-right: 10px;
 }