Devtools UI: Add node-specific actions into a ghost toolbar in DOM

Source/devtools/front_end/elements/elementsPanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * 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
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 39 matching lines @@
 
 #elements-crumbs {
     flex: 0 0 19px;
     background-color: white;
     border-top: 1px solid #ccc;
     overflow: hidden;
     height: 19px;
     width: 100%;
 }
 
-.material #elements-crumbs {
-    flex: auto;
-    border: none;
-    height: 26px;
-}
-
 .metrics {
     padding: 8px;
     font-size: 10px;
     text-align: center;
     white-space: nowrap;
 }
 
 .metrics .label {
     position: absolute;
     font-size: 10px;
@@ skipping 659 matching lines @@
 
 .style-properties li.editing-sub-part {
     padding: 3px 6px 8px 18px;
     margin: -1px -6px -8px -6px;
     text-overflow: clip;
 }
 
 .properties-widget-section {
     padding: 2px 0px 2px 5px;
 }