Exposing DOM float & double types as double rather than num.

tests/html/css_test.dart

 library CssTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlIndividualConfiguration();
 
   group('supportsPointConversions', () {
     test('supported', () {
@@ skipping 12 matching lines @@
           position: absolute;
           width: 60px;
           height: 100px;
           left: 0px;
           top: 0px;
           background-color: red;
           -webkit-transform: translate3d(250px, 100px, 0px);
           ''';
         document.body.append(element);
 
-        Point point = new Point(5, 2);
+        Point point = new Point(5.0, 2.0);
         checkPoint(5, 2, point);
         checkPoint(255, 102, window.convertPointFromNodeToPage(element, point));
-        point = new Point(5, 100);
+        point = new Point(5.0, 100.0);
         checkPoint(5, 100, point);
         checkPoint(255, 200, window.convertPointFromNodeToPage(element, point));
       }, expectation);
     });
   });
 }
 
 void checkPoint(expectedX, expectedY, Point point) {
   expect(point.x.round(), equals(expectedX), reason: 'Wrong point.x');
   expect(point.y.round(), equals(expectedY), reason: 'Wrong point.y');
 }