big update to observe, template_binding, polymer

pkg/observe/lib/src/microtask.dart

-// Copyright (c) 2013, 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.
-
-/**
- * *Warning*: this library is **internal**, and APIs are subject to change.
- *
- * Wraps a callback using [wrapMicrotask] and provides the ability to pump all
- * observable objects and [scheduleMicrotask] calls via
- * [performMicrotaskCheckpoint].
- */
-library observe.src.microtask;
-
-import 'dart:async' show Completer, runZoned, ZoneSpecification;
-import 'dart:collection';
-import 'package:observe/observe.dart' show Observable;
-
-// TODO(jmesserly): remove "microtask" from these names and instead import
-// the library "as microtask"?
-
-/**
- * This change pumps events relevant to observers and data-binding tests.
- * This must be used inside an [observeTest].
- *
- * Executes all pending [scheduleMicrotask] calls on the event loop, as well as
- * performing [Observable.dirtyCheck], until there are no more pending events.
- * It will always dirty check at least once.
- */
-// TODO(jmesserly): do we want to support nested microtasks similar to nested
-// zones? Instead of a single pending list we'd need one per wrapMicrotask,
-// and [performMicrotaskCheckpoint] would only run pending callbacks
-// corresponding to the innermost wrapMicrotask body.
-void performMicrotaskCheckpoint() {
-  Observable.dirtyCheck();
-
-  while (_pending.isNotEmpty) {
-
-    for (int len = _pending.length; len > 0 && _pending.isNotEmpty; len--) {
-      final callback = _pending.removeFirst();
-      try {
-        callback();
-      } catch (e, s) {
-        new Completer().completeError(e, s);
-      }
-    }
-
-    Observable.dirtyCheck();
-  }
-}
-
-final Queue<Function> _pending = new Queue<Function>();
-
-/**
- * Wraps the [body] in a zone that supports [performMicrotaskCheckpoint],
- * and returns the body.
- */
-// TODO(jmesserly): deprecate? this doesn't add much over runMicrotask.
-wrapMicrotask(body()) => () => runMicrotask(body);
-
-/**
- * Runs the [body] in a zone that supports [performMicrotaskCheckpoint],
- * and returns the result.
- */
-runMicrotask(body()) => runZoned(() {
-  try {
-    return body();
-  } finally {
-    performMicrotaskCheckpoint();
-  }
-}, zoneSpecification: new ZoneSpecification(
-    scheduleMicrotask: (self, parent, zone, callback) => _pending.add(callback))
-);