Revert "Reapply zone tasks."

tests/html/request_animation_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 window.requestAnimationFrame.
-
-class MockAnimationFrameTask implements AnimationFrameTask {
-  static int taskId = 499;
-
-  final int id;
-  final Zone zone;
-  bool _isCanceled = false;
-  Function _callback;
-
-  MockAnimationFrameTask(
-      this.id, this.zone, this._callback);
-
-  void cancel(Window window) {
-    _isCanceled = true;
-  }
-
-  trigger(num stamp) {
-    zone.runTask(run, this, stamp);
-  }
-
-  static create(AnimationFrameRequestSpecification spec, Zone zone) {
-    var callback = zone.registerUnaryCallback(spec.callback);
-    return new MockAnimationFrameTask(
-        taskId++, zone, callback);
-  }
-
-  static run(MockAnimationFrameTask task, num arg) {
-    AnimationFrameTask.removeMapping(task.id);
-    task._callback(arg);
-  }
-}
-
-animationFrameTest() {
-  test("animationFrameTest - no intercept", () async {
-    AnimationFrameTask lastTask;
-    bool sawRequest = false;
-    int id;
-    num providedArg;
-
-    Object createTaskHandler(Zone self, ZoneDelegate parent, Zone zone,
-        TaskCreate create, TaskSpecification specification) {
-      if (specification is AnimationFrameRequestSpecification) {
-        sawRequest = true;
-        lastTask = parent.createTask(zone, create, specification);
-        id = lastTask.id;
-        return lastTask;
-      }
-      return parent.createTask(zone, create, specification);
-    }
-
-    void runTaskHandler(Zone self, ZoneDelegate parent, Zone zone, TaskRun run,
-        Object task, Object arg) {
-      if (identical(task, lastTask)) {
-        providedArg = arg;
-      }
-      parent.runTask(zone, run, task, arg);
-    }
-
-    var completer = new Completer();
-    var publicId;
-    runZoned(() {
-      publicId = window.requestAnimationFrame((num stamp) {
-        completer.complete(stamp);
-      });
-    },
-        zoneSpecification: new ZoneSpecification(
-            createTask: createTaskHandler, runTask: runTaskHandler));
-
-    var referenceCompleter = new Completer();
-    window.requestAnimationFrame((num stamp) {
-      referenceCompleter.complete(stamp);
-    });
-
-    var callbackStamp = await completer.future;
-    var referenceStamp = await referenceCompleter.future;
-
-    expect(callbackStamp, equals(referenceStamp));
-    expect(providedArg, equals(callbackStamp));
-    expect(sawRequest, isTrue);
-    expect(publicId, isNotNull);
-    expect(publicId, equals(id));
-  });
-}
-
-interceptedAnimationFrameTest() {
-  test("animationFrameTest - intercepted", () {
-    List<MockAnimationFrameTask> tasks = [];
-    List<num> loggedRuns = [];
-    int executedTaskId;
-    int executedStamp;
-
-    Object createTaskHandler(Zone self, ZoneDelegate parent, Zone zone,
-        TaskCreate create, TaskSpecification specification) {
-      if (specification is AnimationFrameRequestSpecification) {
-        var task = parent.createTask(
-            zone, MockAnimationFrameTask.create, specification);
-        tasks.add(task);
-        return task;
-      }
-      return parent.createTask(zone, create, specification);
-    }
-
-    void runTaskHandler(Zone self, ZoneDelegate parent, Zone zone, TaskRun run,
-        Object task, Object arg) {
-      if (tasks.contains(task)) {
-        loggedRuns.add(arg);
-      }
-      parent.runTask(zone, run, task, arg);
-    }
-
-    var id0, id1, id2;
-
-    runZoned(() {
-      id0 = window.requestAnimationFrame((num stamp) {
-        executedTaskId = id0;
-        executedStamp = stamp;
-      });
-      id1 = window.requestAnimationFrame((num stamp) {
-        executedTaskId = id1;
-        executedStamp = stamp;
-      });
-      id2 = window.requestAnimationFrame((num stamp) {
-        executedTaskId = id2;
-        executedStamp = stamp;
-      });
-    },
-        zoneSpecification: new ZoneSpecification(
-            createTask: createTaskHandler, runTask: runTaskHandler));
-
-    expect(tasks.length, 3);
-    expect(executedTaskId, isNull);
-    expect(executedStamp, isNull);
-    expect(loggedRuns.isEmpty, isTrue);
-
-    tasks[0].trigger(123.1);
-    expect(executedTaskId, id0);
-    expect(executedStamp, 123.1);
-
-    tasks[1].trigger(123.2);
-    expect(executedTaskId, id1);
-    expect(executedStamp, 123.2);
-
-    expect(loggedRuns, equals([123.1, 123.2]));
-
-    window.cancelAnimationFrame(id2);
-    expect(tasks[2]._isCanceled, isTrue);
-    // Cancel it a second time. Should not crash.
-    window.cancelAnimationFrame(id2);
-    expect(tasks[2]._isCanceled, isTrue);
-  });
-}
-
-main() {
-  useHtmlConfiguration();
-
-  animationFrameTest();
-  interceptedAnimationFrameTest();
-}