Copy lib/dom tests that use dart:html to lib/html.

tests/dom/css_test.dart

-#library('CSSTest');
-#import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/html_config.dart');
-#import('dart:html');
-
-main() {
-  useHtmlConfiguration();
-  test('CSSMatrix', () {
-    CSSMatrix matrix1 = new CSSMatrix();
-    Expect.equals(1, matrix1.m11.round());
-    Expect.equals(0, matrix1.m12.round());
-
-    CSSMatrix matrix2 = new CSSMatrix('matrix(1, 0, 0, 1, -835, 0)');
-    Expect.equals(1, matrix2.a.round());
-    Expect.equals(-835, matrix2.e.round());
-  });
-  test('Point', () {
-    Element element = new Element.tag('div');
-    element.attributes['style'] =
-      '''
-      position: absolute;
-      width: 60px;
-      height: 100px;
-      left: 0px;
-      top: 0px;
-      background-color: red;
-      -webkit-transform: translate3d(250px, 100px, 0px) perspective(500px) rotateX(30deg);
-      ''';
-    document.body.nodes.add(element);
-
-    Point point = new Point(5, 2);
-    checkPoint(5, 2, point);
-    checkPoint(256, 110, window.webkitConvertPointFromNodeToPage(element, point));
-    point.y = 100;
-    checkPoint(5, 100, point);
-    checkPoint(254, 196, window.webkitConvertPointFromNodeToPage(element, point));
-  });
-}
-
-void checkPoint(expectedX, expectedY, Point point) {
-  Expect.equals(expectedX, point.x.round(), 'Wrong point.x');
-  Expect.equals(expectedY, point.y.round(), 'Wrong point.y');
-}