Show service worker navigation preload requests in DevTools Network tab

third_party/WebKit/Source/devtools/front_end/network/NetworkDataGridNode.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Anthony Ricaud <rik@webkit.org>
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 767 matching lines @@
           this._linkifiedInitiatorAnchor = this.parentView().linkifier.linkifyScriptLocation(
               request.target(), initiator.scriptId, initiator.url, initiator.lineNumber, initiator.columnNumber);
           this._linkifiedInitiatorAnchor.title = '';
         }
         cell.appendChild(this._linkifiedInitiatorAnchor);
         this._appendSubtitle(cell, Common.UIString('Script'));
         cell.classList.add('network-script-initiated');
         cell.request = request;
         break;
 
+      case SDK.NetworkRequest.InitiatorType.Preload:
+        cell.title = Common.UIString('Preload');
+        cell.classList.add('network-dim-cell');
+        cell.appendChild(createTextNode(Common.UIString('Preload')));
+        break;
+
       default:
         cell.title = Common.UIString('Other');
         cell.classList.add('network-dim-cell');
         cell.appendChild(createTextNode(Common.UIString('Other')));
     }
   }
 
   /**
    * @param {!Element} cell
    */
@@ skipping 84 matching lines @@
    * @param {boolean=} supressSelectedEvent
    */
   select(supressSelectedEvent) {
     if (this.expanded) {
       this.collapse();
       return;
     }
     this.expand();
   }
 };