Add "emulate push event" button to ServiceWorkersView in DevTools [2/2 blink]

Source/devtools/devtools.gypi

 #
 # 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 683 matching lines @@
             'front_end/Images/forward.png',
             'front_end/Images/frame.png',
             'front_end/Images/graphLabelCalloutLeft.png',
             'front_end/Images/graphLabelCalloutRight.png',
             'front_end/Images/indexedDB.png',
             'front_end/Images/indexedDBIndex.png',
             'front_end/Images/indexedDBObjectStore.png',
             'front_end/Images/localStorage.png',
             'front_end/Images/navigationControls.png',
             'front_end/Images/navigationControls_2x.png',
+            'front_end/Images/notifications.svg',
             'front_end/Images/paneAddButtons.png',
             'front_end/Images/paneAnimationsButtons.png',
             'front_end/Images/paneElementStateButtons.png',
             'front_end/Images/paneFilterButtons.png',
             'front_end/Images/paneRefreshButtons.png',
             'front_end/Images/popoverArrows.png',
             'front_end/Images/profileGroupIcon.png',
             'front_end/Images/profileIcon.png',
             'front_end/Images/profileSmallIcon.png',
             'front_end/Images/radioDot.png',
@@ skipping 26 matching lines @@
             'front_end/Images/thumbVert.png',
             'front_end/Images/toolbarItemSelected.png',
             'front_end/Images/touchCursor.png',
             'front_end/Images/touchCursor_2x.png',
         ],
         'devtools_extension_api_files': [
             'front_end/extensions/ExtensionAPI.js',
         ],
     },
 }