Revert zone tasks.

tests/html/event_zone_task_test.dart

-// Copyright (c) 2016, 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 EventTaskZoneTest;
-
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
-import 'dart:async';
-import 'dart:html';
-
-// Tests zone tasks with DOM events.
-
-class AbortedEventStreamSubscription implements StreamSubscription<Event> {
-  final Zone zone;
-
-  AbortedEventStreamSubscription(this.zone);
-
-  @override
-  Future asFuture([futureValue]) {
-    throw new UnsupportedError("asFuture");
-  }
-
-  @override
-  Future cancel() {
-    return null;
-  }
-
-  @override
-  bool get isPaused => throw new UnsupportedError("pause");
-
-  @override
-  void onData(void handleData(Event data)) {
-    throw new UnsupportedError("cancel");
-  }
-
-  @override
-  void onDone(void handleDone()) {
-    throw new UnsupportedError("onDone");
-  }
-
-  @override
-  void onError(Function handleError) {
-    throw new UnsupportedError("onError");
-  }
-
-  @override
-  void pause([Future resumeSignal]) {
-    throw new UnsupportedError("pause");
-  }
-
-  @override
-  void resume() {
-    throw new UnsupportedError("resume");
-  }
-
-  static AbortedEventStreamSubscription _create(
-      EventSubscriptionSpecification spec, Zone zone) {
-    return new AbortedEventStreamSubscription(zone);
-  }
-}
-
-eventTest(String name, Event eventFn(), void validate(Event event),
-    void validateSpec(EventSubscriptionSpecification spec),
-    {String type: 'foo',
-    bool abortCreation: false,
-    EventSubscriptionSpecification modifySpec(
-        EventSubscriptionSpecification spec),
-    bool abortEvent: false,
-    Event modifyEvent(Event event)}) {
-  test(name, () {
-    var lastSpec;
-    var lastTask;
-    var lastEvent;
-
-    Object createTaskHandler(Zone self, ZoneDelegate parent, Zone zone,
-        TaskCreate create, TaskSpecification specification) {
-      if (specification is EventSubscriptionSpecification) {
-        if (abortCreation) {
-          create = AbortedEventStreamSubscription._create;
-        }
-        if (modifySpec != null) {
-          specification = modifySpec(specification);
-        }
-        lastSpec = specification;
-        return lastTask = parent.createTask(zone, create, specification);
-      }
-      return parent.createTask(zone, create, specification);
-    }
-
-    void runTaskHandler(Zone self, ZoneDelegate parent, Zone zone, TaskRun run,
-        Object task, Object arg) {
-      if (identical(task, lastTask)) {
-        if (abortEvent) return;
-        if (modifyEvent != null) {
-          arg = modifyEvent(arg);
-        }
-        parent.runTask(zone, run, task, arg);
-        return;
-      }
-      parent.runTask(zone, run, task, arg);
-    }
-
-    runZoned(() {
-      final el = new Element.tag('div');
-      var fired = false;
-      var sub = el.on[type].listen((ev) {
-        lastEvent = ev;
-        fired = true;
-      });
-      el.dispatchEvent(eventFn());
-
-      validateSpec(lastSpec);
-      validate(lastEvent);
-
-      if (abortEvent || abortCreation) {
-        expect(fired, isFalse, reason: 'Expected event to be intercepted.');
-      } else {
-        expect(fired, isTrue, reason: 'Expected event to be dispatched.');
-      }
-
-      sub.cancel();
-    },
-        zoneSpecification: new ZoneSpecification(
-            createTask: createTaskHandler,
-            runTask: runTaskHandler));
-  });
-}
-
-Function checkSpec(
-    [String expectedType = 'foo', bool expectedUseCapture = false]) {
-  return (EventSubscriptionSpecification spec) {
-    expect(spec.eventType, expectedType);
-    expect(spec.useCapture, expectedUseCapture);
-  };
-}
-
-main() {
-  useHtmlConfiguration();
-
-  eventTest('Event', () => new Event('foo'), (ev) {
-    expect(ev.type, equals('foo'));
-  }, checkSpec('foo'));
-
-  eventTest(
-      'WheelEvent',
-      () => new WheelEvent("mousewheel",
-          deltaX: 1,
-          deltaY: 0,
-          detail: 4,
-          screenX: 3,
-          screenY: 4,
-          clientX: 5,
-          clientY: 6,
-          ctrlKey: true,
-          altKey: true,
-          shiftKey: true,
-          metaKey: true), (ev) {
-    expect(ev.deltaX, 1);
-    expect(ev.deltaY, 0);
-    expect(ev.screen.x, 3);
-    expect(ev.screen.y, 4);
-    expect(ev.client.x, 5);
-    expect(ev.client.y, 6);
-    expect(ev.ctrlKey, isTrue);
-    expect(ev.altKey, isTrue);
-    expect(ev.shiftKey, isTrue);
-    expect(ev.metaKey, isTrue);
-  }, checkSpec('mousewheel'), type: 'mousewheel');
-
-  eventTest('Event - no-create', () => new Event('foo'), (ev) {
-    expect(ev, isNull);
-  }, checkSpec('foo'), abortCreation: true);
-
-  eventTest(
-      'WheelEvent - no-create',
-      () => new WheelEvent("mousewheel",
-          deltaX: 1,
-          deltaY: 0,
-          detail: 4,
-          screenX: 3,
-          screenY: 4,
-          clientX: 5,
-          clientY: 6,
-          ctrlKey: true,
-          altKey: true,
-          shiftKey: true,
-          metaKey: true), (ev) {
-    expect(ev, isNull);
-  }, checkSpec('mousewheel'), type: 'mousewheel', abortCreation: true);
-
-  eventTest('Event - no-run', () => new Event('foo'), (ev) {
-    expect(ev, isNull);
-  }, checkSpec('foo'), abortEvent: true);
-
-  eventTest(
-      'WheelEvent - no-run',
-      () => new WheelEvent("mousewheel",
-          deltaX: 1,
-          deltaY: 0,
-          detail: 4,
-          screenX: 3,
-          screenY: 4,
-          clientX: 5,
-          clientY: 6,
-          ctrlKey: true,
-          altKey: true,
-          shiftKey: true,
-          metaKey: true), (ev) {
-    expect(ev, isNull);
-  }, checkSpec('mousewheel'), type: 'mousewheel', abortEvent: true);
-
-  // Register for 'foo', but receive a 'bar' event, because the specification
-  // is rewritten.
-  eventTest(
-      'Event - replace eventType',
-      () => new Event('bar'),
-      (ev) {
-        expect(ev.type, equals('bar'));
-      },
-      checkSpec('bar'),
-      type: 'foo',
-      modifySpec: (EventSubscriptionSpecification spec) {
-        return spec.replace(eventType: 'bar');
-      });
-
-  // Intercept the 'foo' event and replace it with a 'bar' event.
-  eventTest(
-      'Event - intercept result',
-      () => new Event('foo'),
-      (ev) {
-        expect(ev.type, equals('bar'));
-      },
-      checkSpec('foo'),
-      type: 'foo',
-      modifyEvent: (Event event) {
-        return new Event('bar');
-      });
-}