Migrate dom tests to dart:html.

tests/dom/canvas_test.dart

 #library('CanvasTest');
 #import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/dom_config.dart');
-#import('dart:dom');
+#import('../../lib/unittest/html_config.dart');
+#import('dart:html');
 
 main() {
-  HTMLCanvasElement canvas;
+  CanvasElement canvas;
   CanvasRenderingContext2D context;
   int width = 100;
   int height = 100;
 
-  canvas = document.createElement('canvas');
-  canvas.setAttribute('width', '$width');
-  canvas.setAttribute('height', '$height');
-  document.body.appendChild(canvas);
+  canvas = new Element.tag('canvas');
+  canvas.attributes['width'] = '$width';

[Anton Muhin, 2012/04/27 12:06:34]

do you need to stringify those?

+  canvas.attributes['height'] = '$height';
+  document.body.nodes.add(canvas);
 
   context = canvas.getContext('2d');
 
-  useDomConfiguration();
+  useHtmlConfiguration();
   test('FillStyle', () {
     context.fillStyle = "red";
     context.fillRect(10, 10, 20, 20);
 
     Uint8ClampedArray data = context.getImageData(0, 0, width, height).data;
     checkPixel(data, 0, [0, 0, 0, 0]);
     checkPixel(data, 9 + width * 10, [0, 0, 0, 0]);
     checkPixel(data, 10 + width * 10, [255, 0, 0, 255]);
     checkPixel(data, 29 + width * 10, [255, 0, 0, 255]);
     checkPixel(data, 30 + width * 10, [0, 0, 0, 0]);
@@ skipping 51 matching lines @@
   });
 }
 
 void checkPixel(Uint8ClampedArray data, int offset, List<int> rgba)
 {
   offset *= 4;
   for (var i = 0; i < 4; ++i) {
     Expect.equals(rgba[i], data[offset + i]);
   }
 }