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

test/codegen/lib/html/instance_of_test.dart

Index: test/codegen/lib/html/instance_of_test.dart
diff --git a/test/codegen/lib/html/instance_of_test.dart b/test/codegen/lib/html/instance_of_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..da664db79bef29053fa8ed0c0c4cb3cc75604706
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+++ b/test/codegen/lib/html/instance_of_test.dart
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+library InstanceOfTest;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+
+main() {
+  CanvasElement canvas;
+
+  canvas = new Element.tag('canvas');
+  canvas.attributes['width'] = '100';
+  canvas.attributes['height'] = '100';
+  document.body.append(canvas);
+
+  var isCanvasRenderingContext = predicate((x) => x is CanvasRenderingContext,
+      'is a CanvasRenderingContext');
+  var isCanvasRenderingContext2D =
+      predicate((x) => x is CanvasRenderingContext2D,
+      'is a CanvasRenderingContext2D');
+  var isElement = predicate((x) => x is Element, 'is an Element');
+  var isCanvasElement =
+      predicate((x) => x is CanvasElement, 'is a CanvasElement');
+  var isImageData = predicate((x) => x is ImageData, 'is an ImageData');
+  //var isUint8ClampedArray =
+  //  predicate((x) => x is Uint8ClampedArray, 'is a Uint8ClampedArray');
+  var isIntList =
+      predicate((x) => x is List<int>, 'is a List<int>');
+
+  useHtmlConfiguration();
+  test('Instanceof', () {
+    expect(canvas, isNot(isCanvasRenderingContext));
+    expect(canvas, isNot(isCanvasRenderingContext2D));
+    expect(canvas, isElement);
+    expect(canvas, isCanvasElement);
+    expect(canvas, isNot(isImageData));
+    // expect(canvas, isNot(isCanvasPixelArray));
+
+    CanvasRenderingContext2D context = canvas.getContext('2d');
+    expect(context, isCanvasRenderingContext);
+    expect(context, isCanvasRenderingContext2D);
+    expect(context, isNot(isElement));
+    expect(context, isNot(isCanvasElement));
+    expect(context, isNot(isImageData));
+    // expect(context, isNot(isCanvasPixelArray));
+
+    // FIXME(b/5286633): Interface injection type check workaround.
+    var image = context.createImageData(canvas.width as dynamic,
+                                        canvas.height as dynamic);
+    expect(image, isNot(isCanvasRenderingContext));
+    expect(image, isNot(isCanvasRenderingContext2D));
+    expect(image, isNot(isElement));
+    expect(image, isNot(isCanvasElement));
+    expect(image, isImageData);
+    // expect(image, isNot(isCanvasPixelArray));
+
+    // Include CanvasPixelArray since constructor and prototype are not
+    // available until one is created.
+    var bytes = image.data;
+    expect(bytes, isNot(isCanvasRenderingContext));
+    expect(bytes, isNot(isCanvasRenderingContext2D));
+    expect(bytes, isNot(isElement));
+    expect(bytes, isNot(isCanvasElement));
+    expect(bytes, isNot(isImageData));
+    expect(bytes, isIntList);
+
+    // FIXME: Ensure this is an SpanElement when we next update
+    // WebKit IDL.
+    var span = new Element.tag('span');
+    expect(span, isElement);
+  });
+}