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

test/codegen/lib/html/event_customevent_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 EventCustomEventTest;
+
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+import 'dart:js' as js;
+
+class DartPayloadData {
+  final dartValue;
+
+  DartPayloadData(this.dartValue);
+}
+
+main() {
+  useHtmlConfiguration();
+
+  test('custom events', () {
+    var provider = new EventStreamProvider<CustomEvent>('foo');
+    var el = new DivElement();
+
+    var fired = false;
+    provider.forTarget(el).listen((ev) {
+      fired = true;
+      expect(ev.detail, {'type': 'detail'});
+    });
+
+    var ev = new CustomEvent('foo', canBubble: false, cancelable: false,
+        detail: {'type': 'detail'});
+    el.dispatchEvent(ev);
+    expect(fired, isTrue);
+  });
+
+  test('custom events from JS', () {
+    var scriptContents = '''
+      var event = document.createEvent("CustomEvent");
+      event.initCustomEvent("js_custom_event", true, true, {type: "detail"});
+      window.dispatchEvent(event);
+    ''';
+
+    var fired = false;
+    window.on['js_custom_event'].listen((ev) {
+      fired = true;
+      expect(ev.detail, {'type': 'detail'});
+    });
+
+    var script = new ScriptElement();
+    script.text = scriptContents;
+    document.body.append(script);
+
+    expect(fired, isTrue);
+  });
+
+  test('custom events to JS', () {
+    expect(js.context['gotDartEvent'], isNull);
+    var scriptContents = '''
+      window.addEventListener('dart_custom_event', function(e) {
+        if (e.detail == 'dart_message') {
+          e.preventDefault();
+          window.gotDartEvent = true;
+        }
+        window.console.log('here' + e.detail);
+      }, false);''';
+
+    document.body.append(new ScriptElement()..text = scriptContents);
+
+    var event = new CustomEvent('dart_custom_event', detail: 'dart_message');
+    window.dispatchEvent(event);
+    expect(js.context['gotDartEvent'], isTrue);
+  });
+
+  test('custom data to Dart', () {
+    var data = new DartPayloadData(666);
+    var event = new CustomEvent('dart_custom_data_event', detail: data);
+
+    var future = window.on['dart_custom_data_event'].first.then((_) {
+      expect(event.detail.dartValue, 666);
+    });
+
+    document.body.dispatchEvent(event);
+    return future;
+  });
+}