Devtools: Add new row in toolbarButtonGlyphs and layout editor icon

Source/devtools/front_end/resources/serviceWorkersView.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.
  */
 
 .service-workers-view {
     overflow: auto;
 }
 
@@ skipping 160 matching lines @@
 }
 
 .service-workers-versions-table-running-status-inspect {
     color: #00e;
     cursor: pointer;
     text-decoration: underline;
 }
 
 .service-workers-button {
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
-    -webkit-mask-size: 352px 144px;
+    -webkit-mask-size: 352px 168px;
     background-color: rgba(0, 0, 0, 0.75);
     height: 24px;
     opacity: 0.8;
     width: 32px;
     border: 0;
     padding: 0;
 }
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
 .service-workers-button {
@@ skipping 102 matching lines @@
     background-color: #996600;
 }
 
 .service-workers-color-8 {
     background-color: #9900CC;
 }
 
 .service-workers-color-9 {
     background-color: #336600;
 }