Add zone task support for request-anim.

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 _removeMappingFun;
+  Function _callback;
+
+  MockAnimationFrameTask(
+      this.id, this.zone, this._removeMappingFun, 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, spec.removeMapping, callback);
+  }
+
+  static run(MockAnimationFrameTask task, num arg) {
+    task._removeMappingFun(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);
+  });
+}
+
+main() {
+  useHtmlConfiguration();
+
+  animationFrameTest();
+  interceptedAnimationFrameTest();
+}