DevTools: [CSSP] put -webkit properties to the end of the list.

Source/devtools/front_end/elements/ComputedStyleWidget.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 170 matching lines @@
                 treeElement.listItemElement.addEventListener("dblclick", consumeEvent, false);
                 treeElement.listItemElement.addEventListener("click", handleClick.bind(null, treeElement), false);
             }
         }
 
         this._updateFilter(this._filterRegex);
 
         /**
          * @param {string} a
          * @param {string} b
+         * @return {number}
          */
         function propertySorter(a, b)
         {
+            if (a.startsWith("-webkit") ^ b.startsWith("-webkit"))
+                return a.startsWith("-webkit") ? 1 : -1;
             var canonicalName = WebInspector.CSSMetadata.canonicalPropertyName;
             return canonicalName(a).compareTo(canonicalName(b));
         }
 
         /**
          * @param {!TreeElement} treeElement
          * @param {!Event} event
          */
         function handleClick(treeElement, event)
         {
@@ skipping 84 matching lines @@
         var children = this._propertiesOutline.rootElement().children();
         for (var child of children) {
             var property = child[WebInspector.ComputedStyleWidget._propertySymbol];
             var matched = !regex || regex.test(property.name) || regex.test(property.value);
             child.hidden = !matched;
         }
     },
 
     __proto__: WebInspector.ThrottledWidget.prototype
 }