Selection API: Mutating a Range object after adding it to Selection should update Selection attribu…

third_party/WebKit/LayoutTests/editing/selection/addRange.html

 <p>This tests Selection::addRange().  It should have no effect if the range passed to it does not intersect the currently selected range.  '3456' should be selected.</p>
 <div id="div">123456789</div>
 
 <script>
 var sel = window.getSelection();
 var div = document.getElementById("div");
 var text = div.firstChild;
 
 var range = document.createRange();
 range.setStart(text, 3);
 range.setEnd(text, 5);
 sel.addRange(range);
 
+range = document.createRange();
 range.setStart(text, 4);
 range.setEnd(text, 6);
 sel.addRange(range);
 
+range = document.createRange();
 range.setStart(text, 2);
 range.setEnd(text, 3);
 sel.addRange(range);
 
 // This should have no effect (until we support discontiguous selections) since this range doesn't intersect the currently selected range.
+range = document.createRange();
 range.setStart(text, 7);
 range.setEnd(text, 8);
 sel.addRange(range);
 
 // Ditto.
+range = document.createRange();
 range.setStart(text, 0);
 range.setEnd(text, 1);
 sel.addRange(range);
 
 </script>