Migrate all LayoutTests/dart/dom to main repo.

client/tests/client/dom/WrapperTest.dart

+#library('WrapperTest');
+#import('../../../testing/unittest/unittest.dart');
+#import('dart:dom');
+
+main() {
+  HTMLCanvasElement canvas;
+  CanvasRenderingContext2D context;
+
+  // FIXME: once main is run on content loaded, this hack won't be necessary.
+  window.setTimeout(() {
+    canvas = document.createElement('canvas');
+    canvas.id = 'canvas';
+    canvas.setAttribute('width', '100');
+    canvas.setAttribute('height', '100');
+    document.body.appendChild(canvas);
+    context = canvas.getContext('2d');
+  }, 0);
+
+  forLayoutTests();
+  test('DomType', () {
+    Expect.isTrue(canvas is DOMType);
+    Expect.isTrue(context is DOMType);
+  });
+  test('ObjectLocalStorage', () {
+    final element = document.getElementById('canvas');
+    element.dartObjectLocalStorage = 42;
+
+    Expect.equals(42, canvas.dynamic.dartObjectLocalStorage);
+  });
+  test('TypeName', () {
+    final element = document.getElementById('canvas');
+    Expect.stringEquals('HTMLCanvasElement', element.typeName);
+    Expect.stringEquals('HTMLCanvasElement', canvas.dynamic.typeName);
+    Expect.stringEquals('CanvasRenderingContext2D', context.dynamic.typeName);
+  });
+}