Migrate all LayoutTests/dart/dom to main repo.

client/tests/client/dom/InstanceOfTest.dart

Index: client/tests/client/dom/InstanceOfTest.dart
diff --git a/client/tests/client/dom/InstanceOfTest.dart b/client/tests/client/dom/InstanceOfTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ca8edcd1c55ce6abcc07472320a5dbacc017fe9f
--- /dev/null
+++ b/client/tests/client/dom/InstanceOfTest.dart
@@ -0,0 +1,57 @@
+#library('InstanceOfTest');
+#import('../../../testing/unittest/unittest.dart');
+#import('dart:dom');
+
+main() {
+  HTMLCanvasElement canvas;
+
+  // FIXME: remove when main is ran on content loaded.
+  window.setTimeout(() {
+    canvas = document.createElement('canvas');
+    canvas.setAttribute('width', '100');
+    canvas.setAttribute('height', '100');
+    document.body.appendChild(canvas);
+  }, 0);
+
+  forLayoutTests();
+  test('Instanceof', () {
+    Expect.isFalse(canvas is CanvasRenderingContext);
+    Expect.isFalse(canvas is CanvasRenderingContext2D);
+    Expect.isTrue(canvas is HTMLElement);
+    Expect.isTrue(canvas is HTMLCanvasElement);
+    Expect.isFalse(canvas is ImageData);
+    Expect.isFalse(canvas is CanvasPixelArray);
+
+    CanvasRenderingContext2D context = canvas.getContext('2d');
+    Expect.isTrue(context is CanvasRenderingContext);
+    Expect.isTrue(context is CanvasRenderingContext2D);
+    Expect.isFalse(context is HTMLElement);
+    Expect.isFalse(context is HTMLCanvasElement);
+    Expect.isFalse(context is ImageData);
+    Expect.isFalse(context is CanvasPixelArray);
+
+    // FIXME(b/5286633): Interface injection type check workaround.
+    var image = context.createImageData(canvas.width.dynamic, canvas.height.dynamic);
+    Expect.isFalse(image is CanvasRenderingContext);
+    Expect.isFalse(image is CanvasRenderingContext2D);
+    Expect.isFalse(image is HTMLElement);
+    Expect.isFalse(image is HTMLCanvasElement);
+    Expect.isTrue(image is ImageData);
+    Expect.isFalse(image is CanvasPixelArray);
+
+    // Include CanvasPixelArray since constructor and prototype are not
+    // available until one is created.
+    var bytes = image.data;
+    Expect.isFalse(bytes is CanvasRenderingContext);
+    Expect.isFalse(bytes is CanvasRenderingContext2D);
+    Expect.isFalse(bytes is HTMLElement);
+    Expect.isFalse(bytes is HTMLCanvasElement);
+    Expect.isFalse(bytes is ImageData);
+    Expect.isTrue(bytes is CanvasPixelArray);
+
+    // FIXME: Ensure this is an HTMLSpanElement when we next update
+    // WebKit IDL.
+    var span = document.createElement('span');
+    Expect.isTrue(span is HTMLElement);
+  });
+}