DevTools: render DOM markers with their colors

Source/devtools/front_end/components/DOMPresentationUtils.js

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
@@ skipping 602 matching lines @@
 /**
  * @interface
  */
 WebInspector.DOMPresentationUtils.MarkerDecorator = function()
 {
 }
 
 WebInspector.DOMPresentationUtils.MarkerDecorator.prototype = {
     /**
      * @param {!WebInspector.DOMNode} node
-     * @return {?string}
+     * @return {?{title: string, color: string}}
      */
     decorate: function(node) { }
 }