Add all dart:html tests from the sdk to test/codegen.

test/codegen/lib/html/blob_constructor_test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library blob_test;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+import 'dart:typed_data';
+
+main() {
+  useHtmlConfiguration();
+
+  test('basic', () {
+      var b = new Blob([]);
+      expect(b.size, isZero);
+    });
+
+  test('type1', () {
+      // OPTIONALS var b = new Blob(['Harry'], type: 'text');
+      var b = new Blob(['Harry'], 'text');
+      expect(b.size, 5);
+      expect(b.type, 'text');
+    });
+
+  test('endings1', () {
+      // OPTIONALS var b = new Blob(['A\nB\n'], endings: 'transparent');
+      var b = new Blob(['A\nB\n'], null, 'transparent');
+      expect(b.size, 4);
+    });
+
+  test('endings2', () {
+      // OPTIONALS var b = new Blob(['A\nB\n'], endings: 'native');
+      var b = new Blob(['A\nB\n'], null, 'native');
+      expect(b.size, (x) => x == 4 || x == 6,
+          reason: "b.size should be 4 or 6");
+    });
+
+  test('twoStrings', () {
+      // OPTIONALS var b = new Blob(['123', 'xyz'], type: 'text/plain;charset=UTF-8');
+      var b = new Blob(['123', 'xyz'], 'text/plain;charset=UTF-8');
+      expect(b.size, 6);
+    });
+
+  test('fromBlob1', () {
+      var b1 = new Blob([]);
+      var b2 = new Blob([b1]);
+      expect(b2.size, isZero);
+    });
+
+  test('fromBlob2', () {
+      var b1 = new Blob(['x']);
+      var b2 = new Blob([b1, b1]);
+      expect(b1.size, 1);
+      expect(b2.size, 2);
+    });
+
+  test('fromArrayBuffer', () {
+      var a = new Uint8List(100).buffer; // i.e. new ArrayBuffer(100);
+      var b = new Blob([a, a]);
+      expect(b.size, 200);
+    });
+}