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polymer/lib/src/instance.dart

Index: polymer/lib/src/instance.dart
diff --git a/polymer/lib/src/instance.dart b/polymer/lib/src/instance.dart
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-// 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.
-
-part of polymer;
-
-/// Use this annotation to publish a property as an attribute.
-///
-/// You can also use [PublishedProperty] to provide additional information,
-/// such as automatically syncing the property back to the attribute.
-///
-/// For example:
-///
-///     class MyPlaybackElement extends PolymerElement {
-///       // This will be available as an HTML attribute, for example:
-///       //
-///       //     <my-playback volume="11">
-///       //
-///       // It will support initialization and data-binding via <template>:
-///       //
-///       //     <template>
-///       //       <my-playback volume="{{x}}">
-///       //     </template>
-///       //
-///       // If the template is instantiated or given a model, `x` will be
-///       // used for this field and updated whenever `volume` changes.
-///       @published
-///       double get volume => readValue(#volume);
-///       set volume(double newValue) => writeValue(#volume, newValue);
-///
-///       // This will be available as an HTML attribute, like above, but it
-///       // will also serialize values set to the property to the attribute.
-///       // In other words, attributes['volume2'] will contain a serialized
-///       // version of this field.
-///       @PublishedProperty(reflect: true)
-///       double get volume2 => readValue(#volume2);
-///       set volume2(double newValue) => writeValue(#volume2, newValue);
-///     }
-///
-/// **Important note**: the pattern using `readValue` and `writeValue`
-/// guarantees that reading the property will give you the latest value at any
-/// given time, even if change notifications have not been propagated.
-///
-/// We still support using @published on a field, but this will not
-/// provide the same guarantees, so this is discouraged. For example:
-///
-///       // Avoid this if possible. This will be available as an HTML
-///       // attribute too, but you might need to delay reading volume3
-///       // asynchronously to guarantee that you read the latest value
-///       // set through bindings.
-///       @published double volume3;
-const published = const PublishedProperty();
-
-/// An annotation used to publish a field as an attribute. See [published].
-class PublishedProperty extends ObservableProperty {
-  /// Whether the property value should be reflected back to the HTML attribute.
-  final bool reflect;
-
-  const PublishedProperty({this.reflect: false});
-}
-
-/// Use this type to observe a property and have the method be called when it
-/// changes. For example:
-///
-///     @ObserveProperty('foo.bar baz qux')
-///     validate() {
-///       // use this.foo.bar, this.baz, and this.qux in validation
-///       ...
-///     }
-///
-/// Note that you can observe a property path, and more than a single property
-/// can be specified in a space-delimited list or as a constant List.
-class ObserveProperty {
-  final _names;
-
-  List<String> get names {
-    var n = _names;
-    // TODO(jmesserly): the bogus '$n' is to workaround a dart2js bug, otherwise
-    // it generates an incorrect call site.
-    if (n is String) return '$n'.split(' ');
-    if (n is! Iterable) {
-      throw new UnsupportedError('ObserveProperty takes either an Iterable of '
-          'names, or a space separated String, instead of `$n`.');
-    }
-    return n;
-  }
-
-  const ObserveProperty(this._names);
-}
-
-/// Use this to create computed properties that are updated automatically. The
-/// annotation includes a polymer expression that describes how this property
-/// value can be expressed in terms of the values of other properties. For
-/// example:
-///
-///     class MyPlaybackElement extends PolymerElement {
-///       @observable int x;
-///
-///       // Reading xTimes2 will return x * 2.
-///       @ComputedProperty('x * 2')
-///       int get xTimes2 => readValue(#xTimes2);
-///
-/// If the polymer expression is assignable, you can also define a setter for
-/// it. For example:
-///
-///       // Reading c will return a.b, writing c will update a.b.
-///       @ComputedProperty('a.b')
-///       get c => readValue(#c);
-///       set c(newValue) => writeValue(#c, newValue);
-///
-/// The expression can do anything that is allowed in a polymer expresssion,
-/// even making calls to methods in your element. However, dependencies that are
-/// only used within those methods and that are not visible in the polymer
-/// expression, will not be observed. For example:
-///
-///       // Because `x` only appears inside method `m`, we will not notice
-///       // that `d` has changed if `x` is modified. However, `d` will be
-///       // updated whenever `c` changes.
-///       @ComputedProperty('m(c)')
-///       get d => readValue(#d);
-///
-///       m(c) => c + x;
-class ComputedProperty {
-  /// A polymer expression, evaluated in the context of the custom element where
-  /// this annotation is used.
-  final String expression;
-
-  const ComputedProperty(this.expression);
-}
-
-/// Base class for PolymerElements deriving from HtmlElement.
-///
-/// See [Polymer].
-class PolymerElement extends HtmlElement with Polymer, Observable {
-  PolymerElement.created() : super.created() {
-    polymerCreated();
-  }
-}
-
-/// The mixin class for Polymer elements. It provides convenience features on
-/// top of the custom elements web standard.
-///
-/// If this class is used as a mixin,
-/// you must call `polymerCreated()` from the body of your constructor.
-abstract class Polymer implements Element, Observable, NodeBindExtension {
-
-  // TODO(jmesserly): should this really be public?
-  /// Regular expression that matches data-bindings.
-  static final bindPattern = new RegExp(r'\{\{([^{}]*)}}');
-
-  /// Like [document.register] but for Polymer elements.
-  ///
-  /// Use the [name] to specify custom elment's tag name, for example:
-  /// "fancy-button" if the tag is used as `<fancy-button>`.
-  ///
-  /// The [type] is the type to construct. If not supplied, it defaults to
-  /// [PolymerElement].
-  // NOTE: this is called "element" in src/declaration/polymer-element.js, and
-  // exported as "Polymer".
-  static void register(String name, [Type type]) {
-    //console.log('registering [' + name + ']');
-    if (type == null) type = PolymerElement;
-
-    _typesByName[name] = type;
-
-    // Dart note: here we notify JS of the element registration. We don't pass
-    // the Dart type because we will handle that in PolymerDeclaration.
-    // See _hookJsPolymerDeclaration for how this is done.
-    PolymerJs.constructor.apply([name]);
-    (js.context['HTMLElement']['register'] as JsFunction)
-        .apply([name, js.context['HTMLElement']['prototype']]);
-  }
-
-  /// Register a custom element that has no associated `<polymer-element>`.
-  /// Unlike [register] this will always perform synchronous registration and
-  /// by the time this method returns the element will be available using
-  /// [document.createElement] or by modifying the HTML to include the element.
-  static void registerSync(String name, Type type,
-      {String extendsTag, Document doc, Node template}) {
-
-    // Our normal registration, this will queue up the name->type association.
-    register(name, type);
-
-    // Build a polymer-element and initialize it to register
-    if (doc == null) doc = document;
-    var poly = doc.createElement('polymer-element');
-    poly.attributes['name'] = name;
-    if (extendsTag != null) poly.attributes['extends'] = extendsTag;
-    if (template != null) poly.append(template);
-
-    // TODO(jmesserly): conceptually this is just:
-    //     new JsObject.fromBrowserObject(poly).callMethod('init')
-    //
-    // However doing it that way hits an issue with JS-interop in IE10: we get a
-    // JsObject that wraps something other than `poly`, due to improper caching.
-    // By reusing _polymerElementProto that we used for 'register', we can
-    // then call apply on it to invoke init() with the correct `this` pointer.
-    JsFunction init = _polymerElementProto['init'];
-    init.apply([], thisArg: poly);
-  }
-
-  // Warning for when people try to use `importElements` or `import`.
-  static const String _DYNAMIC_IMPORT_WARNING = 'Dynamically loading html '
-      'imports has very limited support right now in dart, see '
-      'http://dartbug.com/17873.';
-
-  /// Loads the set of HTMLImports contained in `node`. Returns a future that
-  /// resolves when all the imports have been loaded. This method can be used to
-  /// lazily load imports. For example, given a template:
-  ///
-  ///     <template>
-  ///       <link rel="import" href="my-import1.html">
-  ///       <link rel="import" href="my-import2.html">
-  ///     </template>
-  ///
-  ///     Polymer.importElements(template.content)
-  ///         .then((_) => print('imports lazily loaded'));
-  ///
-  /// Dart Note: This has very limited support in dart, http://dartbug.com/17873
-  // Dart Note: From src/lib/import.js For now proxy to the JS methods,
-  // because we want to share the loader with polymer.js for interop purposes.
-  static Future importElements(Node elementOrFragment) {
-    print(_DYNAMIC_IMPORT_WARNING);
-    return PolymerJs.importElements(elementOrFragment);
-  }
-
-  /// Loads an HTMLImport for each url specified in the `urls` array. Notifies
-  /// when all the imports have loaded by calling the `callback` function
-  /// argument. This method can be used to lazily load imports. For example,
-  /// For example,
-  ///
-  ///     Polymer.import(['my-import1.html', 'my-import2.html'])
-  ///         .then((_) => print('imports lazily loaded'));
-  ///
-  /// Dart Note: This has very limited support in dart, http://dartbug.com/17873
-  // Dart Note: From src/lib/import.js. For now proxy to the JS methods,
-  // because we want to share the loader with polymer.js for interop purposes.
-  static Future import(List urls) {
-    print(_DYNAMIC_IMPORT_WARNING);
-    return PolymerJs.import(urls);
-  }
-
-  /// Deprecated: Use `import` instead.
-  @deprecated
-  static Future importUrls(List urls) {
-    return import(urls);
-  }
-
-  /// Completes when polymer js is ready.
-  static final Completer _onReady = new Completer();
-
-  /// Completes when all initialization is done.
-  static final Completer _onInitDone = new Completer();
-
-  /// Future indicating that the Polymer library has been loaded and is ready
-  /// for use.
-  static Future get onReady =>
-      Future.wait([_onReady.future, _onInitDone.future]);
-
-  /// Returns a list of elements that have had polymer-elements created but
-  /// are not yet ready to register. The list is an array of element
-  /// definitions.
-  static List<Element> get waitingFor => PolymerJs.waitingFor;
-
-  /// Forces polymer to register any pending elements. Can be used to abort
-  /// waiting for elements that are partially defined.
-  static forceReady([int timeout]) => PolymerJs.forceReady(timeout);
-
-  /// The most derived `<polymer-element>` declaration for this element.
-  PolymerDeclaration get element => _element;
-  PolymerDeclaration _element;
-
-  /// Deprecated: use [element] instead.
-  @deprecated PolymerDeclaration get declaration => _element;
-
-  Map<String, StreamSubscription> _namedObservers;
-  List<Bindable> _observers = [];
-
-  bool _unbound; // lazy-initialized
-  PolymerJob _unbindAllJob;
-
-  CompoundObserver _propertyObserver;
-  bool _readied = false;
-
-  JsObject _jsElem;
-
-  /// Returns the object that should be used as the event controller for
-  /// event bindings in this element's template. If set, this will override the
-  /// normal controller lookup.
-  // TODO(jmesserly): we need to use a JS-writable property as our backing
-  // store, because of elements such as:
-  // https://github.com/Polymer/core-overlay/blob/eeb14853/core-overlay-layer.html#L78
-  get eventController => _jsElem['eventController'];
-  set eventController(value) {
-    _jsElem['eventController'] = value;
-  }
-
-  bool get hasBeenAttached => _hasBeenAttached;
-  bool _hasBeenAttached = false;
-
-  /// Gets the shadow root associated with the corresponding custom element.
-  ///
-  /// This is identical to [shadowRoot], unless there are multiple levels of
-  /// inheritance and they each have their own shadow root. For example,
-  /// this can happen if the base class and subclass both have `<template>` tags
-  /// in their `<polymer-element>` tags.
-  // TODO(jmesserly): should expose this as an immutable map.
-  // Similar issue as $.
-  final Map<String, ShadowRoot> shadowRoots =
-      new LinkedHashMap<String, ShadowRoot>();
-
-  /// Map of items in the shadow root(s) by their [Element.id].
-  // TODO(jmesserly): various issues:
-  // * wrap in UnmodifiableMapView?
-  // * should we have an object that implements noSuchMethod?
-  // * should the map have a key order (e.g. LinkedHash or SplayTree)?
-  // * should this be a live list? Polymer doesn't, maybe due to JS limitations?
-  // Note: this is observable to support $['someId'] being used in templates.
-  // The template is stamped before $ is populated, so we need observation if
-  // we want it to be usable in bindings.
-  final Map<String, dynamic> $ = new ObservableMap<String, dynamic>();
-
-  /// Use to override the default syntax for polymer-elements.
-  /// By default this will be null, which causes [instanceTemplate] to use
-  /// the template's bindingDelegate or the [element.syntax], in that order.
-  PolymerExpressions get syntax => null;
-
-  bool get _elementPrepared => _element != null;
-
-  /// Retrieves the custom element name. It should be used instead
-  /// of localName, see: https://github.com/Polymer/polymer-dev/issues/26
-  String get _name {
-    if (_element != null) return _element.name;
-    var isAttr = attributes['is'];
-    return (isAttr == null || isAttr == '') ? localName : isAttr;
-  }
-
-  /// By default the data bindings will be cleaned up when this custom element
-  /// is detached from the document. Overriding this to return `true` will
-  /// prevent that from happening.
-  bool get preventDispose => false;
-
-  /// Properties exposed by this element.
-  // Dart note: unlike Javascript we can't override the original property on
-  // the object, so we use this mechanism instead to define properties. See more
-  // details in [_PropertyAccessor].
-  Map<Symbol, _PropertyAccessor> _properties = {};
-
-  /// Helper to implement a property with the given [name]. This is used for
-  /// normal and computed properties. Normal properties can provide the initial
-  /// value using the [initialValue] function. Computed properties ignore
-  /// [initialValue], their value is derived from the expression in the
-  /// [ComputedProperty] annotation that appears above the getter that uses this
-  /// helper.
-  readValue(Symbol name, [initialValue()]) {
-    var property = _properties[name];
-    if (property == null) {
-      var value;
-      // Dart note: most computed properties are created in advance in
-      // createComputedProperties, but if one computed property depends on
-      // another, the declaration order might matter. Rather than trying to
-      // register them in order, we include here also the option of lazily
-      // creating the property accessor on the first read.
-      var binding = _getBindingForComputedProperty(name);
-      if (binding == null) {
-        // normal property
-        value = initialValue != null ? initialValue() : null;
-      } else {
-        value = binding.value;
-      }
-      property = _properties[name] = new _PropertyAccessor(name, this, value);
-    }
-    return property.value;
-  }
-
-  /// Helper to implement a setter of a property with the given [name] on a
-  /// polymer element. This can be used on normal properties and also on
-  /// computed properties, as long as the expression used for the computed
-  /// property is assignable (see [ComputedProperty]).
-  writeValue(Symbol name, newValue) {
-    var property = _properties[name];
-    if (property == null) {
-      // Note: computed properties are created in advance in
-      // createComputedProperties, so we should only need to create here
-      // non-computed properties.
-      property = _properties[name] = new _PropertyAccessor(name, this, null);
-    }
-    property.value = newValue;
-  }
-
-  /// If this class is used as a mixin, this method must be called from inside
-  /// of the `created()` constructor.
-  ///
-  /// If this class is a superclass, calling `super.created()` is sufficient.
-  void polymerCreated() {
-    var t = nodeBind(this).templateInstance;
-    if (t != null && t.model != null) {
-      window.console.warn('Attributes on $_name were data bound '
-          'prior to Polymer upgrading the element. This may result in '
-          'incorrect binding types.');
-    }
-    prepareElement();
-    if (!isTemplateStagingDocument(ownerDocument)) {
-      _makeElementReady();
-    }
-  }
-
-  /// *Deprecated* use [shadowRoots] instead.
-  @deprecated
-  ShadowRoot getShadowRoot(String customTagName) => shadowRoots[customTagName];
-
-  void prepareElement() {
-    if (_elementPrepared) {
-      window.console.warn('Element already prepared: $_name');
-      return;
-    }
-    _initJsObject();
-    // Dart note: get the corresponding <polymer-element> declaration.
-    _element = _getDeclaration(_name);
-    // install property storage
-    createPropertyObserver();
-    openPropertyObserver();
-    // install boilerplate attributes
-    copyInstanceAttributes();
-    // process input attributes
-    takeAttributes();
-    // add event listeners
-    addHostListeners();
-  }
-
-  /// Initialize JS interop for this element. For now we just initialize the
-  /// JsObject, but in the future we could also initialize JS APIs here.
-  _initJsObject() {
-    _jsElem = new JsObject.fromBrowserObject(this);
-  }
-
-  /// Deprecated: This is no longer a public method.
-  @deprecated
-  makeElementReady() => _makeElementReady();
-
-  _makeElementReady() {
-    if (_readied) return;
-    _readied = true;
-    createComputedProperties();
-
-    parseDeclarations(_element);
-    // NOTE: Support use of the `unresolved` attribute to help polyfill
-    // custom elements' `:unresolved` feature.
-    attributes.remove('unresolved');
-    // user entry point
-    _readyLog.info(() => '[$this]: ready');
-    ready();
-  }
-
-  /// Lifecycle method called when the element has populated it's `shadowRoot`,
-  /// prepared data-observation, and made itself ready for API interaction.
-  /// To wait until the element has been attached to the default view, use
-  /// [attached] or [domReady].
-  void ready() {}
-
-  /// Implement to access custom elements in dom descendants, ancestors,
-  /// or siblings. Because custom elements upgrade in document order,
-  /// elements accessed in `ready` or `attached` may not be upgraded. When
-  /// `domReady` is called, all registered custom elements are guaranteed
-  /// to have been upgraded.
-  void domReady() {}
-
-  void attached() {
-    if (!_elementPrepared) {
-      // Dart specific message for a common issue.
-      throw new StateError('polymerCreated was not called for custom element '
-          '$_name, this should normally be done in the .created() if Polymer '
-          'is used as a mixin.');
-    }
-
-    cancelUnbindAll();
-    if (!hasBeenAttached) {
-      _hasBeenAttached = true;
-      async((_) => domReady());
-    }
-  }
-
-  void detached() {
-    if (!preventDispose) asyncUnbindAll();
-  }
-
-  /// Walks the prototype-chain of this element and allows specific
-  /// classes a chance to process static declarations.
-  ///
-  /// In particular, each polymer-element has it's own `template`.
-  /// `parseDeclarations` is used to accumulate all element `template`s
-  /// from an inheritance chain.
-  ///
-  /// `parseDeclaration` static methods implemented in the chain are called
-  /// recursively, oldest first, with the `<polymer-element>` associated
-  /// with the current prototype passed as an argument.
-  ///
-  /// An element may override this method to customize shadow-root generation.
-  void parseDeclarations(PolymerDeclaration declaration) {
-    if (declaration != null) {
-      parseDeclarations(declaration.superDeclaration);
-      parseDeclaration(declaration.element);
-    }
-  }
-
-  /// Perform init-time actions based on static information in the
-  /// `<polymer-element>` instance argument.
-  ///
-  /// For example, the standard implementation locates the template associated
-  /// with the given `<polymer-element>` and stamps it into a shadow-root to
-  /// implement shadow inheritance.
-  ///
-  /// An element may override this method for custom behavior.
-  void parseDeclaration(Element elementElement) {
-    var template = fetchTemplate(elementElement);
-
-    if (template != null) {
-      var root = shadowFromTemplate(template);
-
-      var name = elementElement.attributes['name'];
-      if (name == null) return;
-      shadowRoots[name] = root;
-    }
-  }
-
-  /// Given a `<polymer-element>`, find an associated template (if any) to be
-  /// used for shadow-root generation.
-  ///
-  /// An element may override this method for custom behavior.
-  Element fetchTemplate(Element elementElement) =>
-      elementElement.querySelector('template');
-
-  /// Utility function that stamps a `<template>` into light-dom.
-  Node lightFromTemplate(Element template, [Node refNode]) {
-    if (template == null) return null;
-
-    // TODO(sorvell): mark this element as an event controller so that
-    // event listeners on bound nodes inside it will be called on it.
-    // Note, the expectation here is that events on all descendants
-    // should be handled by this element.
-    eventController = this;
-
-    // stamp template
-    // which includes parsing and applying MDV bindings before being
-    // inserted (to avoid {{}} in attribute values)
-    // e.g. to prevent <img src="images/{{icon}}"> from generating a 404.
-    var dom = instanceTemplate(template);
-    // append to shadow dom
-    if (refNode != null) {
-      append(dom);
-    } else {
-      insertBefore(dom, refNode);
-    }
-    // perform post-construction initialization tasks on ahem, light root
-    shadowRootReady(this);
-    // return the created shadow root
-    return dom;
-  }
-
-  /// Utility function that creates a shadow root from a `<template>`.
-  ///
-  /// The base implementation will return a [ShadowRoot], but you can replace it
-  /// with your own code and skip ShadowRoot creation. In that case, you should
-  /// return `null`.
-  ///
-  /// In your overridden method, you can use [instanceTemplate] to stamp the
-  /// template and initialize data binding, and [shadowRootReady] to intialize
-  /// other Polymer features like event handlers. It is fine to call
-  /// shadowRootReady with a node other than a ShadowRoot such as with `this`.
-  ShadowRoot shadowFromTemplate(Element template) {
-    if (template == null) return null;
-    // make a shadow root
-    var root = createShadowRoot();
-    // stamp template
-    // which includes parsing and applying MDV bindings before being
-    // inserted (to avoid {{}} in attribute values)
-    // e.g. to prevent <img src="images/{{icon}}"> from generating a 404.
-    var dom = instanceTemplate(template);
-    // append to shadow dom
-    root.append(dom);
-    // perform post-construction initialization tasks on shadow root
-    shadowRootReady(root);
-    // return the created shadow root
-    return root;
-  }
-
-  void shadowRootReady(Node root) {
-    // locate nodes with id and store references to them in this.$ hash
-    marshalNodeReferences(root);
-  }
-
-  /// Locate nodes with id and store references to them in [$] hash.
-  void marshalNodeReferences(Node root) {
-    if (root == null) return;
-    for (var n in (root as dynamic).querySelectorAll('[id]')) {
-      $[n.id] = n;
-    }
-  }
-
-  void attributeChanged(String name, String oldValue, String newValue) {
-    if (name != 'class' && name != 'style') {
-      attributeToProperty(name, newValue);
-    }
-  }
-
-  // TODO(jmesserly): this could be a top level method.
-  /// Returns a future when `node` changes, or when its children or subtree
-  /// changes.
-  ///
-  /// Use [MutationObserver] if you want to listen to a stream of changes.
-  Future<List<MutationRecord>> onMutation(Node node) {
-    var completer = new Completer();
-    new MutationObserver((mutations, observer) {
-      observer.disconnect();
-      completer.complete(mutations);
-    })..observe(node, childList: true, subtree: true);
-    return completer.future;
-  }
-
-  // copy attributes defined in the element declaration to the instance
-  // e.g. <polymer-element name="x-foo" tabIndex="0"> tabIndex is copied
-  // to the element instance here.
-  void copyInstanceAttributes() {
-    _element._instanceAttributes.forEach((name, value) {
-      attributes.putIfAbsent(name, () => value);
-    });
-  }
-
-  void takeAttributes() {
-    if (_element._publishLC == null) return;
-    attributes.forEach(attributeToProperty);
-  }
-
-  /// If attribute [name] is mapped to a property, deserialize
-  /// [value] into that property.
-  void attributeToProperty(String name, String value) {
-    // try to match this attribute to a property (attributes are
-    // all lower-case, so this is case-insensitive search)
-    var decl = propertyForAttribute(name);
-    if (decl == null) return;
-
-    // filter out 'mustached' values, these are to be
-    // replaced with bound-data and are not yet values
-    // themselves.
-    if (value == null || value.contains(Polymer.bindPattern)) return;
-
-    final currentValue = smoke.read(this, decl.name);
-
-    // deserialize Boolean or Number values from attribute
-    var type = decl.type;
-    if ((type == Object || type == dynamic) && currentValue != null) {
-      // Attempt to infer field type from the current value.
-      type = currentValue.runtimeType;
-    }
-    final newValue = deserializeValue(value, currentValue, type);
-
-    // only act if the value has changed
-    if (!identical(newValue, currentValue)) {
-      // install new value (has side-effects)
-      smoke.write(this, decl.name, newValue);
-    }
-  }
-
-  /// Return the published property matching name, or null.
-  // TODO(jmesserly): should we just return Symbol here?
-  smoke.Declaration propertyForAttribute(String name) {
-    final publishLC = _element._publishLC;
-    if (publishLC == null) return null;
-    return publishLC[name];
-  }
-
-  /// Convert representation of [value] based on [type] and [currentValue].
-  Object deserializeValue(String value, Object currentValue, Type type) =>
-      deserialize.deserializeValue(value, currentValue, type);
-
-  String serializeValue(Object value) {
-    if (value == null) return null;
-
-    if (value is bool) {
-      return _toBoolean(value) ? '' : null;
-    } else if (value is String || value is num) {
-      return '$value';
-    }
-    return null;
-  }
-
-  void reflectPropertyToAttribute(String path) {
-    // TODO(sjmiles): consider memoizing this
-    // try to intelligently serialize property value
-    final propValue = new PropertyPath(path).getValueFrom(this);
-    final serializedValue = serializeValue(propValue);
-    // boolean properties must reflect as boolean attributes
-    if (serializedValue != null) {
-      attributes[path] = serializedValue;
-      // TODO(sorvell): we should remove attr for all properties
-      // that have undefined serialization; however, we will need to
-      // refine the attr reflection system to achieve this; pica, for example,
-      // relies on having inferredType object properties not removed as
-      // attrs.
-    } else if (propValue is bool) {
-      attributes.remove(path);
-    }
-  }
-
-  /// Creates the document fragment to use for each instance of the custom
-  /// element, given the `<template>` node. By default this is equivalent to:
-  ///
-  ///     templateBind(template).createInstance(this, polymerSyntax);
-  ///
-  /// Where polymerSyntax is a singleton [PolymerExpressions] instance.
-  ///
-  /// You can override this method to change the instantiation behavior of the
-  /// template, for example to use a different data-binding syntax.
-  DocumentFragment instanceTemplate(Element template) {
-    // ensure template is decorated (lets things like <tr template ...> work)
-    TemplateBindExtension.decorate(template);
-    var syntax = this.syntax;
-    var t = templateBind(template);
-    if (syntax == null && t.bindingDelegate == null) {
-      syntax = element.syntax;
-    }
-    var dom = t.createInstance(this, syntax);
-    _observers.addAll(getTemplateInstanceBindings(dom));
-    return dom;
-  }
-
-  /// Called by TemplateBinding/NodeBind to setup a binding to the given
-  /// property. It's overridden here to support property bindings in addition to
-  /// attribute bindings that are supported by default.
-  Bindable bind(String name, bindable, {bool oneTime: false}) {
-    var decl = propertyForAttribute(name);
-    if (decl == null) {
-      // Cannot call super.bind because template_binding is its own package
-      return nodeBindFallback(this).bind(name, bindable, oneTime: oneTime);
-    } else {
-      // use n-way Polymer binding
-      var observer = bindProperty(decl.name, bindable, oneTime: oneTime);
-      // NOTE: reflecting binding information is typically required only for
-      // tooling. It has a performance cost so it's opt-in in Node.bind.
-      if (enableBindingsReflection && observer != null) {
-        // Dart note: this is not needed because of how _PolymerBinding works.
-        //observer.path = bindable.path_;
-        _recordBinding(name, observer);
-      }
-      var reflect = _element._reflect;
-
-      // Get back to the (possibly camel-case) name for the property.
-      var propName = smoke.symbolToName(decl.name);
-      if (reflect != null && reflect.contains(propName)) {
-        reflectPropertyToAttribute(propName);
-      }
-      return observer;
-    }
-  }
-
-  _recordBinding(String name, observer) {
-    if (bindings == null) bindings = {};
-    this.bindings[name] = observer;
-  }
-
-  /// Called by TemplateBinding when all bindings on an element have been
-  /// executed. This signals that all element inputs have been gathered and it's
-  /// safe to ready the element, create shadow-root and start data-observation.
-  bindFinished() => _makeElementReady();
-
-  Map<String, Bindable> get bindings => nodeBindFallback(this).bindings;
-  set bindings(Map value) {
-    nodeBindFallback(this).bindings = value;
-  }
-
-  TemplateInstance get templateInstance =>
-      nodeBindFallback(this).templateInstance;
-
-  /// Called at detached time to signal that an element's bindings should be
-  /// cleaned up. This is done asynchronously so that users have the chance to
-  /// call `cancelUnbindAll` to prevent unbinding.
-  void asyncUnbindAll() {
-    if (_unbound == true) return;
-    _unbindLog.fine(() => '[$_name] asyncUnbindAll');
-    _unbindAllJob = scheduleJob(_unbindAllJob, unbindAll);
-  }
-
-  /// This method should rarely be used and only if `cancelUnbindAll` has been
-  /// called to prevent element unbinding. In this case, the element's bindings
-  /// will not be automatically cleaned up and it cannot be garbage collected by
-  /// by the system. If memory pressure is a concern or a large amount of
-  /// elements need to be managed in this way, `unbindAll` can be called to
-  /// deactivate the element's bindings and allow its memory to be reclaimed.
-  void unbindAll() {
-    if (_unbound == true) return;
-    closeObservers();
-    closeNamedObservers();
-    _unbound = true;
-  }
-
-  //// Call in `detached` to prevent the element from unbinding when it is
-  //// detached from the dom. The element is unbound as a cleanup step that
-  //// allows its memory to be reclaimed. If `cancelUnbindAll` is used, consider
-  /// calling `unbindAll` when the element is no longer needed. This will allow
-  /// its memory to be reclaimed.
-  void cancelUnbindAll() {
-    if (_unbound == true) {
-      _unbindLog
-          .warning(() => '[$_name] already unbound, cannot cancel unbindAll');
-      return;
-    }
-    _unbindLog.fine(() => '[$_name] cancelUnbindAll');
-    if (_unbindAllJob != null) {
-      _unbindAllJob.stop();
-      _unbindAllJob = null;
-    }
-  }
-
-  static void _forNodeTree(Node node, void callback(Node node)) {
-    if (node == null) return;
-
-    callback(node);
-    for (var child = node.firstChild; child != null; child = child.nextNode) {
-      _forNodeTree(child, callback);
-    }
-  }
-
-  /// Creates a CompoundObserver to observe property changes.
-  /// NOTE, this is only done if there are any properties in the `_observe`
-  /// object.
-  void createPropertyObserver() {
-    final observe = _element._observe;
-    if (observe != null) {
-      var o = _propertyObserver = new CompoundObserver();
-      // keep track of property observer so we can shut it down
-      _observers.add(o);
-
-      for (var path in observe.keys) {
-        o.addPath(this, path);
-
-        // TODO(jmesserly): on the Polymer side it doesn't look like they
-        // will observe arrays unless it is a length == 1 path.
-        observeArrayValue(path, path.getValueFrom(this), null);
-      }
-    }
-  }
-
-  /// Start observing property changes.
-  void openPropertyObserver() {
-    if (_propertyObserver != null) {
-      _propertyObserver.open(notifyPropertyChanges);
-    }
-
-    // Dart note: we need an extra listener only to continue supporting
-    // @published properties that follow the old syntax until we get rid of it.
-    // This workaround has timing issues so we prefer the new, not so nice,
-    // syntax.
-    if (_element._publish != null) {
-      changes.listen(_propertyChangeWorkaround);
-    }
-  }
-
-  /// Handler for property changes; routes changes to observing methods.
-  /// Note: array valued properties are observed for array splices.
-  void notifyPropertyChanges(List newValues, Map oldValues, List paths) {
-    final observe = _element._observe;
-    final called = new HashSet();
-
-    oldValues.forEach((i, oldValue) {
-      final newValue = newValues[i];
-
-      // Date note: we don't need any special checking for null and undefined.
-
-      // note: paths is of form [object, path, object, path]
-      final path = paths[2 * i + 1];
-      if (observe == null) return;
-
-      var methods = observe[path];
-      if (methods == null) return;
-
-      for (var method in methods) {
-        if (!called.add(method)) continue; // don't invoke more than once.
-
-        observeArrayValue(path, newValue, oldValue);
-        // Dart note: JS passes "arguments", so we pass along our args.
-        // TODO(sorvell): call method with the set of values it's expecting;
-        // e.g. 'foo bar': 'invalidate' expects the new and old values for
-        // foo and bar. Currently we give only one of these and then
-        // deliver all the arguments.
-        smoke.invoke(
-            this, method, [oldValue, newValue, newValues, oldValues, paths],
-            adjust: true);
-      }
-    });
-  }
-
-  /// Force any pending property changes to synchronously deliver to handlers
-  /// specified in the `observe` object.
-  /// Note: normally changes are processed at microtask time.
-  ///
-  // Dart note: had to rename this to avoid colliding with
-  // Observable.deliverChanges. Even worse, super calls aren't possible or
-  // it prevents Polymer from being a mixin, so we can't override it even if
-  // we wanted to.
-  void deliverPropertyChanges() {
-    if (_propertyObserver != null) {
-      _propertyObserver.deliver();
-    }
-  }
-
-  // Dart note: this workaround is only for old-style @published properties,
-  // which have timing issues. See _bindOldStylePublishedProperty below.
-  // TODO(sigmund): deprecate this.
-  void _propertyChangeWorkaround(List<ChangeRecord> records) {
-    for (var record in records) {
-      if (record is! PropertyChangeRecord) continue;
-
-      var name = record.name;
-      // The setter of a new-style property will create an accessor in
-      // _properties[name]. We can skip the workaround for those properties.
-      if (_properties[name] != null) continue;
-      _propertyChange(name, record.newValue, record.oldValue);
-    }
-  }
-
-  void _propertyChange(Symbol nameSymbol, newValue, oldValue) {
-    _watchLog.info(
-        () => '[$this]: $nameSymbol changed from: $oldValue to: $newValue');
-    var name = smoke.symbolToName(nameSymbol);
-    var reflect = _element._reflect;
-    if (reflect != null && reflect.contains(name)) {
-      reflectPropertyToAttribute(name);
-    }
-  }
-
-  void observeArrayValue(PropertyPath name, Object value, Object old) {
-    final observe = _element._observe;
-    if (observe == null) return;
-
-    // we only care if there are registered side-effects
-    var callbacks = observe[name];
-    if (callbacks == null) return;
-
-    // if we are observing the previous value, stop
-    if (old is ObservableList) {
-      _observeLog.fine(() => '[$_name] observeArrayValue: unregister $name');
-
-      closeNamedObserver('${name}__array');
-    }
-    // if the new value is an array, begin observing it
-    if (value is ObservableList) {
-      _observeLog.fine(() => '[$_name] observeArrayValue: register $name');
-      var sub = value.listChanges.listen((changes) {
-        for (var callback in callbacks) {
-          smoke.invoke(this, callback, [changes], adjust: true);
-        }
-      });
-      registerNamedObserver('${name}__array', sub);
-    }
-  }
-
-  emitPropertyChangeRecord(Symbol name, newValue, oldValue) {
-    if (identical(oldValue, newValue)) return;
-    _propertyChange(name, newValue, oldValue);
-  }
-
-  bindToAccessor(Symbol name, Bindable bindable, {resolveBindingValue: false}) {
-    // Dart note: our pattern is to declare the initial value in the getter.  We
-    // read it via smoke to ensure that the value is initialized correctly.
-    var oldValue = smoke.read(this, name);
-    var property = _properties[name];
-    if (property == null) {
-      // We know that _properties[name] is null only for old-style @published
-      // properties. This fallback is here to make it easier to deprecate the
-      // old-style of published properties, which have bad timing guarantees
-      // (see comment in _PolymerBinding).
-      return _bindOldStylePublishedProperty(name, bindable, oldValue);
-    }
-
-    property.bindable = bindable;
-    var value = bindable.open(property.updateValue);
-
-    if (resolveBindingValue) {
-      // capture A's value if B's value is null or undefined,
-      // otherwise use B's value
-      var v = (value == null ? oldValue : value);
-      if (!identical(value, oldValue)) {
-        bindable.value = value = v;
-      }
-    }
-
-    property.updateValue(value);
-    var o = new _CloseOnlyBinding(property);
-    _observers.add(o);
-    return o;
-  }
-
-  // Dart note: this fallback uses our old-style binding mechanism to be able to
-  // link @published properties with bindings. This mechanism is backwards from
-  // what Javascript does because we can't override the original property. This
-  // workaround also brings some timing issues which are described in detail in
-  // dartbug.com/18343.
-  // TODO(sigmund): deprecate old-style @published properties.
-  _bindOldStylePublishedProperty(Symbol name, Bindable bindable, oldValue) {
-    // capture A's value if B's value is null or undefined,
-    // otherwise use B's value
-    if (bindable.value == null) bindable.value = oldValue;
-
-    var o = new _PolymerBinding(this, name, bindable);
-    _observers.add(o);
-    return o;
-  }
-
-  _getBindingForComputedProperty(Symbol name) {
-    var exprString = element._computed[name];
-    if (exprString == null) return null;
-    var expr = PolymerExpressions.getExpression(exprString);
-    return PolymerExpressions.getBinding(expr, this,
-        globals: element.syntax.globals);
-  }
-
-  createComputedProperties() {
-    var computed = this.element._computed;
-    for (var name in computed.keys) {
-      try {
-        // Dart note: this is done in Javascript by modifying the prototype in
-        // declaration/properties.js, we can't do that, so we do it here.
-        var binding = _getBindingForComputedProperty(name);
-
-        // Follow up note: ideally we would only create the accessor object
-        // here, but some computed properties might depend on others and
-        // evaluating `binding.value` could try to read the value of another
-        // computed property that we haven't created yet. For this reason we
-        // also allow to also create the accessor in [readValue].
-        if (_properties[name] == null) {
-          _properties[name] = new _PropertyAccessor(name, this, binding.value);
-        }
-        bindToAccessor(name, binding);
-      } catch (e) {
-        window.console.error('Failed to create computed property $name'
-            ' (${computed[name]}): $e');
-      }
-    }
-  }
-
-  // Dart note: to simplify the code above we made registerObserver calls
-  // directly invoke _observers.add/addAll.
-  void closeObservers() {
-    for (var o in _observers) {
-      if (o != null) o.close();
-    }
-    _observers = [];
-  }
-
-  /// Bookkeeping observers for memory management.
-  void registerNamedObserver(String name, StreamSubscription sub) {
-    if (_namedObservers == null) {
-      _namedObservers = new Map<String, StreamSubscription>();
-    }
-    _namedObservers[name] = sub;
-  }
-
-  bool closeNamedObserver(String name) {
-    var sub = _namedObservers.remove(name);
-    if (sub == null) return false;
-    sub.cancel();
-    return true;
-  }
-
-  void closeNamedObservers() {
-    if (_namedObservers == null) return;
-    for (var sub in _namedObservers.values) {
-      if (sub != null) sub.cancel();
-    }
-    _namedObservers.clear();
-    _namedObservers = null;
-  }
-
-  /// Bind the [name] property in this element to [bindable]. *Note* in Dart it
-  /// is necessary to also define the field:
-  ///
-  ///     var myProperty;
-  ///
-  ///     ready() {
-  ///       super.ready();
-  ///       bindProperty(#myProperty,
-  ///           new PathObserver(this, 'myModel.path.to.otherProp'));
-  ///     }
-  Bindable bindProperty(Symbol name, bindableOrValue, {oneTime: false}) {
-    // Dart note: normally we only reach this code when we know it's a
-    // property, but if someone uses bindProperty directly they might get a
-    // NoSuchMethodError either from the getField below, or from the setField
-    // inside PolymerBinding. That doesn't seem unreasonable, but it's a slight
-    // difference from Polymer.js behavior.
-
-    _bindLog.fine(() => 'bindProperty: [$bindableOrValue] to [$_name].[$name]');
-
-    if (oneTime) {
-      if (bindableOrValue is Bindable) {
-        _bindLog.warning(() =>
-            'bindProperty: expected non-bindable value n a one-time binding to '
-            '[$_name].[$name], but found $bindableOrValue.');
-      }
-      smoke.write(this, name, bindableOrValue);
-      return null;
-    }
-
-    return bindToAccessor(name, bindableOrValue, resolveBindingValue: true);
-  }
-
-  /// Attach event listeners on the host (this) element.
-  void addHostListeners() {
-    var events = _element._eventDelegates;
-    if (events.isEmpty) return;
-
-    _eventsLog.fine(() => '[$_name] addHostListeners: $events');
-
-    // NOTE: host events look like bindings but really are not;
-    // (1) we don't want the attribute to be set and (2) we want to support
-    // multiple event listeners ('host' and 'instance') and Node.bind
-    // by default supports 1 thing being bound.
-    events.forEach((type, methodName) {
-      // Dart note: the getEventHandler method is on our PolymerExpressions.
-      PolymerGesturesJs.addEventListener(
-          this, type,
-          Zone.current.bindUnaryCallback(
-              element.syntax.getEventHandler(this, this, methodName)));
-    });
-  }
-
-  /// Calls [methodOrCallback] with [args] if it is a closure, otherwise, treat
-  /// it as a method name in [object], and invoke it.
-  void dispatchMethod(object, callbackOrMethod, List args) {
-    _eventsLog.info(() => '>>> [$_name]: dispatch $callbackOrMethod');
-
-    if (callbackOrMethod is Function) {
-      int maxArgs = smoke.maxArgs(callbackOrMethod);
-      if (maxArgs == -1) {
-        _eventsLog.warning(
-            'invalid callback: expected callback of 0, 1, 2, or 3 arguments');
-      }
-      args.length = maxArgs;
-      Function.apply(callbackOrMethod, args);
-    } else if (callbackOrMethod is String) {
-      smoke.invoke(object, smoke.nameToSymbol(callbackOrMethod), args,
-          adjust: true);
-    } else {
-      _eventsLog.warning('invalid callback');
-    }
-
-    _eventsLog.fine(() => '<<< [$_name]: dispatch $callbackOrMethod');
-  }
-
-  /// Call [methodName] method on this object with [args].
-  invokeMethod(Symbol methodName, List args) =>
-      smoke.invoke(this, methodName, args, adjust: true);
-
-  /// Invokes a function asynchronously.
-  /// This will call `Polymer.flush()` and then return a `new Timer`
-  /// with the provided [method] and [timeout].
-  ///
-  /// If you would prefer to run the callback using
-  /// [window.requestAnimationFrame], see the [async] method.
-  ///
-  /// To cancel, call [Timer.cancel] on the result of this method.
-  Timer asyncTimer(void method(), Duration timeout) {
-    // Dart note: "async" is split into 2 methods so it can have a sensible type
-    // signatures. Also removed the various features that don't make sense in a
-    // Dart world, like binding to "this" and taking arguments list.
-
-    // when polyfilling Object.observe, ensure changes
-    // propagate before executing the async method
-    scheduleMicrotask(Observable.dirtyCheck);
-    PolymerJs.flush(); // for polymer-js interop
-    return new Timer(timeout, method);
-  }
-
-  /// Invokes a function asynchronously. The context of the callback function is
-  /// function is bound to 'this' automatically. Returns a handle which may be
-  /// passed to cancelAsync to cancel the asynchronous call.
-  ///
-  /// If you would prefer to run the callback after a given duration, see
-  /// the [asyncTimer] method.
-  ///
-  /// If you would like to cancel this, use [cancelAsync].
-  int async(RequestAnimationFrameCallback method) {
-    // when polyfilling Object.observe, ensure changes
-    // propagate before executing the async method
-    scheduleMicrotask(Observable.dirtyCheck);
-    PolymerJs.flush(); // for polymer-js interop
-    return window.requestAnimationFrame(method);
-  }
-
-  /// Cancel an operation scheduled by [async].
-  void cancelAsync(int id) => window.cancelAnimationFrame(id);
-
-  /// Fire a [CustomEvent] targeting [onNode], or `this` if onNode is not
-  /// supplied. Returns the new event.
-  CustomEvent fire(String type,
-      {Object detail, Node onNode, bool canBubble, bool cancelable}) {
-    var node = onNode != null ? onNode : this;
-    var event = new CustomEvent(type,
-        canBubble: canBubble != null ? canBubble : true,
-        cancelable: cancelable != null ? cancelable : true,
-        detail: detail);
-    node.dispatchEvent(event);
-    return event;
-  }
-
-  /// Fire an event asynchronously. See [async] and [fire].
-  asyncFire(String type, {Object detail, Node toNode, bool canBubble}) {
-    // TODO(jmesserly): I'm not sure this method adds much in Dart, it's easy to
-    // add "() =>"
-    async((x) =>
-        fire(type, detail: detail, onNode: toNode, canBubble: canBubble));
-  }
-
-  /// Remove [className] from [old], add class to [anew], if they exist.
-  void classFollows(Element anew, Element old, String className) {
-    if (old != null) {
-      old.classes.remove(className);
-    }
-    if (anew != null) {
-      anew.classes.add(className);
-    }
-  }
-
-  /// Installs external stylesheets and <style> elements with the attribute
-  /// polymer-scope='controller' into the scope of element. This is intended
-  /// to be called during custom element construction.
-  void installControllerStyles() {
-    var scope = findStyleScope();
-    if (scope != null && !scopeHasNamedStyle(scope, localName)) {
-      // allow inherited controller styles
-      var decl = _element;
-      var cssText = new StringBuffer();
-      while (decl != null) {
-        cssText.write(decl.cssTextForScope(_STYLE_CONTROLLER_SCOPE));
-        decl = decl.superDeclaration;
-      }
-      if (cssText.isNotEmpty) {
-        installScopeCssText('$cssText', scope);
-      }
-    }
-  }
-
-  void installScopeStyle(style, [String name, Node scope]) {
-    if (scope == null) scope = findStyleScope();
-    if (name == null) name = '';
-
-    if (scope != null && !scopeHasNamedStyle(scope, '$_name$name')) {
-      var cssText = new StringBuffer();
-      if (style is Iterable) {
-        for (var s in style) {
-          cssText
-            ..writeln(s.text)
-            ..writeln();
-        }
-      } else {
-        cssText = (style as Node).text;
-      }
-      installScopeCssText('$cssText', scope, name);
-    }
-  }
-
-  void installScopeCssText(String cssText, [Node scope, String name]) {
-    if (scope == null) scope = findStyleScope();
-    if (name == null) name = '';
-
-    if (scope == null) return;
-
-    if (_hasShadowDomPolyfill) {
-      cssText = _shimCssText(cssText, scope is ShadowRoot ? scope.host : null);
-    }
-    var style = element.cssTextToScopeStyle(cssText, _STYLE_CONTROLLER_SCOPE);
-    applyStyleToScope(style, scope);
-    // cache that this style has been applied
-    styleCacheForScope(scope).add('$_name$name');
-  }
-
-  Node findStyleScope([node]) {
-    // find the shadow root that contains this element
-    var n = node;
-    if (n == null) n = this;
-    while (n.parentNode != null) {
-      n = n.parentNode;
-    }
-    return n;
-  }
-
-  bool scopeHasNamedStyle(Node scope, String name) =>
-      styleCacheForScope(scope).contains(name);
-
-  Map _polyfillScopeStyleCache = {};
-
-  Set styleCacheForScope(Node scope) {
-    var styles;
-    if (_hasShadowDomPolyfill) {
-      var name = scope is ShadowRoot
-          ? scope.host.localName
-          : (scope as Element).localName;
-      var styles = _polyfillScopeStyleCache[name];
-      if (styles == null) _polyfillScopeStyleCache[name] = styles = new Set();
-    } else {
-      styles = _scopeStyles[scope];
-      if (styles == null) _scopeStyles[scope] = styles = new Set();
-    }
-    return styles;
-  }
-
-  static final _scopeStyles = new Expando();
-
-  static String _shimCssText(String cssText, [Element host]) {
-    var name = '';
-    var is_ = false;
-    if (host != null) {
-      name = host.localName;
-      is_ = host.attributes.containsKey('is');
-    }
-    var selector = _ShadowCss.callMethod('makeScopeSelector', [name, is_]);
-    return _ShadowCss.callMethod('shimCssText', [cssText, selector]);
-  }
-
-  static void applyStyleToScope(StyleElement style, Node scope) {
-    if (style == null) return;
-
-    if (scope == document) scope = document.head;
-
-    if (_hasShadowDomPolyfill) scope = document.head;
-
-    // TODO(sorvell): necessary for IE
-    // see https://connect.microsoft.com/IE/feedback/details/790212/
-    // cloning-a-style-element-and-adding-to-document-produces
-    // -unexpected-result#details
-    // var clone = style.cloneNode(true);
-    var clone = new StyleElement()..text = style.text;
-
-    var attr = style.attributes[_STYLE_SCOPE_ATTRIBUTE];
-    if (attr != null) {
-      clone.attributes[_STYLE_SCOPE_ATTRIBUTE] = attr;
-    }
-
-    // TODO(sorvell): probably too brittle; try to figure out
-    // where to put the element.
-    var refNode = scope.firstChild;
-    if (scope == document.head) {
-      var selector = 'style[$_STYLE_SCOPE_ATTRIBUTE]';
-      var styleElement = document.head.querySelectorAll(selector);
-      if (styleElement.isNotEmpty) {
-        refNode = styleElement.last.nextElementSibling;
-      }
-    }
-    scope.insertBefore(clone, refNode);
-  }
-
-  /// Invoke [callback] in [wait], unless the job is re-registered,
-  /// which resets the timer. If [wait] is not supplied, this will use
-  /// [window.requestAnimationFrame] instead of a [Timer].
-  ///
-  /// For example:
-  ///
-  ///     _myJob = Polymer.scheduleJob(_myJob, callback);
-  ///
-  /// Returns the newly created job.
-  // Dart note: renamed to scheduleJob to be a bit more consistent with Dart.
-  PolymerJob scheduleJob(PolymerJob job, void callback(), [Duration wait]) {
-    if (job == null) job = new PolymerJob._();
-    // Dart note: made start smarter, so we don't need to call stop.
-    return job..start(callback, wait);
-  }
-
-  // Deprecated: Please use injectBoundHtml.
-  @deprecated
-  DocumentFragment injectBoundHTML(String html, [Element element]) =>
-      injectBoundHtml(html, element: element);
-
-  /// Inject HTML which contains markup bound to this element into
-  /// a target element (replacing target element content).
-  DocumentFragment injectBoundHtml(String html, {Element element,
-      NodeValidator validator, NodeTreeSanitizer treeSanitizer}) {
-    var template = new TemplateElement()
-      ..setInnerHtml(html, validator: validator, treeSanitizer: treeSanitizer);
-    var fragment = this.instanceTemplate(template);
-    if (element != null) {
-      element.text = '';
-      element.append(fragment);
-    }
-    return fragment;
-  }
-}
-
-// Dart note: this is related to _bindOldStylePublishedProperty. Polymer
-// addresses n-way bindings by metaprogramming: redefine the property on the
-// PolymerElement instance to always get its value from the model@path. This is
-// supported in Dart using a new style of @published property declaration using
-// the `readValue` and `writeValue` methods above. In the past we used to work
-// around this by listening to changes on both sides and updating the values.
-// This object provides the hooks to do this.
-// TODO(sigmund,jmesserly): delete after a deprecation period.
-class _PolymerBinding extends Bindable {
-  final Polymer _target;
-  final Symbol _property;
-  final Bindable _bindable;
-  StreamSubscription _sub;
-  Object _lastValue;
-
-  _PolymerBinding(this._target, this._property, this._bindable) {
-    _sub = _target.changes.listen(_propertyValueChanged);
-    _updateNode(open(_updateNode));
-  }
-
-  void _updateNode(newValue) {
-    _lastValue = newValue;
-    smoke.write(_target, _property, newValue);
-    // Note: we don't invoke emitPropertyChangeRecord here because that's
-    // done by listening on changes on the PolymerElement.
-  }
-
-  void _propertyValueChanged(List<ChangeRecord> records) {
-    for (var record in records) {
-      if (record is PropertyChangeRecord && record.name == _property) {
-        final newValue = smoke.read(_target, _property);
-        if (!identical(_lastValue, newValue)) {
-          this.value = newValue;
-        }
-        return;
-      }
-    }
-  }
-
-  open(callback(value)) => _bindable.open(callback);
-  get value => _bindable.value;
-  set value(newValue) => _bindable.value = newValue;
-
-  void close() {
-    if (_sub != null) {
-      _sub.cancel();
-      _sub = null;
-    }
-    _bindable.close();
-  }
-}
-
-// Ported from an inline object in instance/properties.js#bindToAccessor.
-class _CloseOnlyBinding extends Bindable {
-  final _PropertyAccessor accessor;
-
-  _CloseOnlyBinding(this.accessor);
-
-  open(callback) {}
-  get value => null;
-  set value(newValue) {}
-  deliver() {}
-
-  void close() {
-    if (accessor.bindable == null) return;
-    accessor.bindable.close();
-    accessor.bindable = null;
-  }
-}
-
-bool _toBoolean(value) => null != value && false != value;
-
-final Logger _observeLog = new Logger('polymer.observe');
-final Logger _eventsLog = new Logger('polymer.events');
-final Logger _unbindLog = new Logger('polymer.unbind');
-final Logger _bindLog = new Logger('polymer.bind');
-final Logger _watchLog = new Logger('polymer.watch');
-final Logger _readyLog = new Logger('polymer.ready');
-
-final Expando _eventHandledTable = new Expando<Set<Node>>();