Move web-platform-tests to wpt (part 1 of 2)

third_party/WebKit/LayoutTests/imported/wpt/dom/nodes/Element-matches.js

 /*
  * Check that the matches() method exists on the given Node
  */
 function interfaceCheckMatches(type, obj) {
   if (obj.nodeType === obj.ELEMENT_NODE) {
     test(function() {
       assert_idl_attribute(obj, "matches", type + " supports matches");
     }, type + " supports matches")
   }
 }
@@ skipping 107 matching lines @@
             for (j = 0; j < u.length; j++) {
               element = root.querySelector("#" + u[j]);
               assert_false(element.matches(q), "The element #" + u[j] + " should not match the selector.")
             }
           }
         }, type + " Element.matches: " + n + " (with no refNodes): " + q);
       }
     }
   }
 }