Move the dom directory from web-platform-tests/ to wpt/.

third_party/WebKit/LayoutTests/imported/wpt/dom/nodes/Document-createComment-createTextNode.js

 function test_create(method, iface, nodeType, nodeName) {
   ["\u000b", "a -- b", "a-", "-b", null, undefined].forEach(function(value) {
     test(function() {
       var c = document[method](value);
       var expected = String(value);
       assert_true(c instanceof iface);
       assert_true(c instanceof CharacterData);
       assert_true(c instanceof Node);
       assert_equals(c.ownerDocument, document);
       assert_equals(c.data, expected, "data");
       assert_equals(c.nodeValue, expected, "nodeValue");
       assert_equals(c.textContent, expected, "textContent");
       assert_equals(c.length, expected.length);
       assert_equals(c.nodeType, nodeType);
       assert_equals(c.nodeName, nodeName);
       assert_equals(c.hasChildNodes(), false);
       assert_equals(c.childNodes.length, 0);
       assert_equals(c.firstChild, null);
       assert_equals(c.lastChild, null);
     }, method + "(" + format_value(value) + ")");
   });
 }