Correctly calculate highlighted quad for tracing based timeline events

Source/devtools/front_end/timeline/TimelineView.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 811 matching lines @@
      */
     _highlightQuad: function(rowElement)
     {
         if (!rowElement || !rowElement.row)
             return false;
         var record = rowElement.row._record.record();
         if (this._highlightedQuadRecord === record)
             return true;
         this._highlightedQuadRecord = record;
 
-        var quad = null;
-        var recordTypes = WebInspector.TimelineModel.RecordType;
-        switch(record.type()) {
-        case recordTypes.Layout:
-            quad = record.data().root;
-            break;
-        case recordTypes.Paint:
-            quad = record.data().clip;
-            break;
-        default:
-            return false;
-        }
+        var quad = record.highlightQuad();
         if (!quad)
             return false;
         record.target().domAgent().highlightQuad(quad, WebInspector.Color.PageHighlight.Content.toProtocolRGBA(), WebInspector.Color.PageHighlight.ContentOutline.toProtocolRGBA());
         return true;
     },
 
     _hideQuadHighlight: function()
     {
         if (this._highlightedQuadRecord) {
             this._highlightedQuadRecord.target().domAgent().hideHighlight();
@@ skipping 445 matching lines @@
             this._element.classList.remove("hidden");
         } else
             this._element.classList.add("hidden");
     },
 
     _dispose: function()
     {
         this._element.remove();
     }
 }