Added base template for config ui.

appengine/config_service/ui/bower_components/polymer/lib/mixins/element-mixin.html

Index: appengine/config_service/ui/bower_components/polymer/lib/mixins/element-mixin.html
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+<!--
+@license
+Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../utils/boot.html">
+<link rel="import" href="../utils/mixin.html">
+<link rel="import" href="../utils/case-map.html">
+<link rel="import" href="../utils/style-gather.html">
+<link rel="import" href="../utils/resolve-url.html">
+<link rel="import" href="../elements/dom-module.html">
+<link rel="import" href="property-effects.html">
+
+<script>
+(function() {
+  'use strict';
+  /**
+   * @typedef Object<string, {
+   *   value: *,
+   *   type: (Function | undefined),
+   *   readOnly: (boolean | undefined),
+   *   computed: (string | undefined),
+   *   reflectToAttribute: (boolean | undefined),
+   *   notify: (boolean | undefined),
+   *   observer: (string | undefined)
+   * }>)
+   */
+  let PolymerElementProperties; // eslint-disable-line no-unused-vars
+
+  /** @record */
+  let PolymerElementConstructor = function(){}; // eslint-disable-line no-unused-vars
+  /** @type {(string | undefined)} */
+  PolymerElementConstructor.is;
+  /** @type {(string | undefined)} */
+  PolymerElementConstructor.extends;
+  /** @type {(!PolymerElementProperties | undefined)} */
+  PolymerElementConstructor.properties;
+  /** @type {(!Array<string> | undefined)} */
+  PolymerElementConstructor.observers;
+  /** @type {(!HTMLTemplateElement | string | undefined)} */
+  PolymerElementConstructor.template;
+
+  /**
+   * Element class mixin that provides the core API for Polymer's meta-programming
+   * features including template stamping, data-binding, attribute deserialization,
+   * and property change observation.
+   *
+   * Subclassers may provide the following static getters to return metadata
+   * used to configure Polymer's features for the class:
+   *
+   * - `static get is()`: When the template is provided via a `dom-module`,
+   *   users should return the `dom-module` id from a static `is` getter.  If
+   *   no template is needed or the template is provided directly via the
+   *   `template` getter, there is no need to define `is` for the element.
+   *
+   * - `static get template()`: Users may provide the template directly (as
+   *   opposed to via `dom-module`) by implementing a static `template` getter.
+   *   The getter may return an `HTMLTemplateElement` or a string, which will
+   *   automatically be parsed into a template.
+   *
+   * - `static get properties()`: Should return an object describing
+   *   property-related metadata used by Polymer features (key: property name
+   *   value: object containing property metadata). Valid keys in per-property
+   *   metadata include:
+   *   - `type` (String|Number|Object|Array|...): Used by
+   *     `attributeChangedCallback` to determine how string-based attributes
+   *     are deserialized to JavaScript property values.
+   *   - `notify` (boolean): Causes a change in the property to fire a
+   *     non-bubbling event called `<property>-changed`. Elements that have
+   *     enabled two-way binding to the property use this event to observe changes.
+   *   - `readOnly` (boolean): Creates a getter for the property, but no setter.
+   *     To set a read-only property, use the private setter method
+   *     `_setProperty(property, value)`.
+   *   - `observer` (string): Observer method name that will be called when
+   *     the property changes. The arguments of the method are
+   *     `(value, previousValue)`.
+   *   - `computed` (string): String describing method and dependent properties
+   *     for computing the value of this property (e.g. `'computeFoo(bar, zot)'`).
+   *     Computed properties are read-only by default and can only be changed
+   *     via the return value of the computing method.
+   *
+   * - `static get observers()`: Array of strings describing multi-property
+   *   observer methods and their dependent properties (e.g.
+   *   `'observeABC(a, b, c)'`).
+   *
+   * The base class provides default implementations for the following standard
+   * custom element lifecycle callbacks; users may override these, but should
+   * call the super method to ensure
+   * - `constructor`: Run when the element is created or upgraded
+   * - `connectedCallback`: Run each time the element is connected to the
+   *   document
+   * - `disconnectedCallback`: Run each time the element is disconnected from
+   *   the document
+   * - `attributeChangedCallback`: Run each time an attribute in
+   *   `observedAttributes` is set or removed (note: this element's default
+   *   `observedAttributes` implementation will automatically return an array
+   *   of dash-cased attributes based on `properties`)
+   *
+   * @polymerMixin
+   * @mixes Polymer.PropertyEffects
+   * @memberof Polymer
+   * @property rootPath {string} Set to the value of `Polymer.rootPath`,
+   *   which defaults to the main document path
+   * @property importPath {string} Set to the value of the class's static
+   *   `importPath` property, which defaults to the path of this element's
+   *   `dom-module` (when `is` is used), but can be overridden for other
+   *   import strategies.
+   * @summary Element class mixin that provides the core API for Polymer's
+   * meta-programming features.
+   */
+  Polymer.ElementMixin = Polymer.dedupingMixin(base => {
+
+    /**
+     * @constructor
+     * @extends {base}
+     * @implements {Polymer_PropertyEffects}
+     */
+    const polymerElementBase = Polymer.PropertyEffects(base);
+
+    let caseMap = Polymer.CaseMap;
+
+    /**
+     * Returns the `properties` object specifically on `klass`. Use for:
+     * (1) super chain mixes togther to make `propertiesForClass` which is
+     * then used to make `observedAttributes`.
+     * (2) properties effects and observers are created from it at `finalize` time.
+     *
+     * @param {HTMLElement} klass Element class
+     * @return {Object} Object containing own properties for this class
+     * @private
+     */
+    function ownPropertiesForClass(klass) {
+      if (!klass.hasOwnProperty(
+        JSCompiler_renameProperty('__ownProperties', klass))) {
+        klass.__ownProperties =
+          klass.hasOwnProperty(JSCompiler_renameProperty('properties', klass)) ?
+          klass.properties : {};
+      }
+      return klass.__ownProperties;
+    }
+
+    /**
+     * Returns the `observers` array specifically on `klass`. Use for
+     * setting up observers.
+     *
+     * @param {HTMLElement} klass Element class
+     * @return {Array} Array containing own observers for this class
+     * @private
+     */
+    function ownObserversForClass(klass) {
+      if (!klass.hasOwnProperty(
+        JSCompiler_renameProperty('__ownObservers', klass))) {
+        klass.__ownObservers =
+          klass.hasOwnProperty(JSCompiler_renameProperty('observers', klass)) ?
+          klass.observers : [];
+      }
+      return klass.__ownObservers;
+    }
+
+    /**
+     * Mixes `props` into `flattenedProps` but upgrades shorthand type
+     * syntax to { type: Type}.
+     *
+     * @param {Object} flattenedProps Bag to collect flattened properties into
+     * @param {Object} props Bag of properties to add to `flattenedProps`
+     * @return {Objecg} The input `flattenedProps` bag
+     * @private
+     */
+    function flattenProperties(flattenedProps, props) {
+      for (let p in props) {
+        let o = props[p];
+        if (typeof o == 'function') {
+          o = { type: o };
+        }
+        flattenedProps[p] = o;
+      }
+      return flattenedProps;
+    }
+
+    /**
+     * Returns a flattened list of properties mixed together from the chain of all
+     * constructor's `config.properties`. This list is used to create
+     * (1) observedAttributes,
+     * (2) class property default values
+     *
+     * @param {HTMLElement} klass Element class
+     * @return {PolymerElementProperties} Flattened properties for this class
+     * @private
+     */
+    function propertiesForClass(klass) {
+      if (!klass.hasOwnProperty(
+        JSCompiler_renameProperty('__classProperties', klass))) {
+        klass.__classProperties =
+        flattenProperties({}, ownPropertiesForClass(klass));
+        let superCtor = Object.getPrototypeOf(klass.prototype).constructor;
+        if (superCtor.prototype instanceof PolymerElement) {
+          klass.__classProperties = Object.assign(
+            Object.create(propertiesForClass(superCtor)),
+            klass.__classProperties);
+        }
+      }
+      return klass.__classProperties;
+    }
+
+    /**
+     * Returns a list of properties with default values.
+     * This list is created as an optimization since it is a subset of
+     * the list returned from `propertiesForClass`.
+     * This list is used in `_initializeProperties` to set property defaults.
+     *
+     * @param {HTMLElement} klass Element class
+     * @return {PolymerElementProperties} Flattened properties for this class
+     *   that have default values
+     * @private
+     */
+    function propertyDefaultsForClass(klass) {
+      if (!klass.hasOwnProperty(
+        JSCompiler_renameProperty('__classPropertyDefaults', klass))) {
+        klass.__classPropertyDefaults = null;
+        let props = propertiesForClass(klass);
+        for (let p in props) {
+          let info = props[p];
+          if ('value' in info) {
+            klass.__classPropertyDefaults = klass.__classPropertyDefaults || {};
+            klass.__classPropertyDefaults[p] = info;
+          }
+        }
+      }
+      return klass.__classPropertyDefaults;
+    }
+
+    /**
+     * Returns true if a `klass` has finalized. Called in `ElementClass.finalize()`
+     * @param {HTMLElement} klass Element class
+     * @return {boolean} True if all metaprogramming for this class has been
+     *   completed
+     * @private
+     */
+    function hasClassFinalized(klass) {
+      return klass.hasOwnProperty(JSCompiler_renameProperty('__finalized', klass));
+    }
+
+    /**
+     * Called by `ElementClass.finalize()`. Ensures this `klass` and
+     * *all superclasses* are finalized by traversing the prototype chain
+     * and calling `klass.finalize()`.
+     *
+     * @param {HTMLElement} klass Element class
+     * @private
+     */
+    function finalizeClassAndSuper(klass) {
+      let proto = klass.prototype;
+      let superCtor = Object.getPrototypeOf(proto).constructor;
+      if (superCtor.prototype instanceof PolymerElement) {
+        superCtor.finalize();
+      }
+      finalizeClass(klass);
+    }
+
+    /**
+     * Configures a `klass` based on a staic `klass.config` object and
+     * a `template`. This includes creating accessors and effects
+     * for properties in `config` and the `template` as well as preparing the
+     * `template` for stamping.
+     *
+     * @param {HTMLElement} klass Element class
+     * @private
+     */
+    function finalizeClass(klass) {
+      klass.__finalized = true;
+      let proto = klass.prototype;
+      if (klass.hasOwnProperty(
+        JSCompiler_renameProperty('is', klass)) && klass.is) {
+        Polymer.telemetry.register(proto);
+      }
+      let props = ownPropertiesForClass(klass);
+      if (props) {
+        finalizeProperties(proto, props);
+      }
+      let observers = ownObserversForClass(klass);
+      if (observers) {
+        finalizeObservers(proto, observers, props);
+      }
+      // note: create "working" template that is finalized at instance time
+      let template = klass.template;
+      if (template) {
+        if (typeof template === 'string') {
+          let t = document.createElement('template');
+          t.innerHTML = template;
+          template = t;
+        } else {
+          template = template.cloneNode(true);
+        }
+        proto._template = template;
+      }
+    }
+
+    /**
+     * Configures a `proto` based on a `properties` object.
+     * Leverages `PropertyEffects` to create property accessors and effects
+     * supporting, observers, reflecting to attributes, change notification,
+     * computed properties, and read only properties.
+     * @param {HTMLElement} proto Element class prototype to add accessors
+     *    and effects to
+     * @param {Object} properties Flattened bag of property descriptors for
+     *    this class
+     * @private
+     */
+    function finalizeProperties(proto, properties) {
+      for (let p in properties) {
+        createPropertyFromConfig(proto, p, properties[p], properties);
+      }
+    }
+
+    /**
+     * Configures a `proto` based on a `observers` array.
+     * Leverages `PropertyEffects` to create observers.
+     * @param {HTMLElement} proto Element class prototype to add accessors
+     *   and effects to
+     * @param {Object} observers Flattened array of observer descriptors for
+     *   this class
+     * @param {Object} dynamicFns Object containing keys for any properties
+     *   that are functions and should trigger the effect when the function
+     *   reference is changed
+     * @private
+     */
+    function finalizeObservers(proto, observers, dynamicFns) {
+      for (let i=0; i < observers.length; i++) {
+        proto._createMethodObserver(observers[i], dynamicFns);
+      }
+    }
+
+    /**
+     * Creates effects for a property.
+     *
+     * Note, once a property has been set to
+     * `readOnly`, `computed`, `reflectToAttribute`, or `notify`
+     * these values may not be changed. For example, a subclass cannot
+     * alter these settings. However, additional `observers` may be added
+     * by subclasses.
+     *
+     * The info object should may contain property metadata as follows:
+     *
+     * * `type`: {function} type to which an attribute matching the property
+     * is deserialized. Note the property is camel-cased from a dash-cased
+     * attribute. For example, 'foo-bar' attribute is dersialized to a
+     * property named 'fooBar'.
+     *
+     * * `readOnly`: {boolean} creates a readOnly property and
+     * makes a private setter for the private of the form '_setFoo' for a
+     * property 'foo',
+     *
+     * * `computed`: {string} creates a computed property. A computed property
+     * also automatically is set to `readOnly: true`. The value is calculated
+     * by running a method and arguments parsed from the given string. For
+     * example 'compute(foo)' will compute a given property when the
+     * 'foo' property changes by executing the 'compute' method. This method
+     * must return the computed value.
+     *
+     * * `reflectToAttriute`: {boolean} If true, the property value is reflected
+     * to an attribute of the same name. Note, the attribute is dash-cased
+     * so a property named 'fooBar' is reflected as 'foo-bar'.
+     *
+     * * `notify`: {boolean} sends a non-bubbling notification event when
+     * the property changes. For example, a property named 'foo' sends an
+     * event named 'foo-changed' with `event.detail` set to the value of
+     * the property.
+     *
+     * * observer: {string} name of a method that runs when the property
+     * changes. The arguments of the method are (value, previousValue).
+     *
+     * Note: Users may want control over modifying property
+     * effects via subclassing. For example, a user might want to make a
+     * reflectToAttribute property not do so in a subclass. We've chosen to
+     * disable this because it leads to additional complication.
+     * For example, a readOnly effect generates a special setter. If a subclass
+     * disables the effect, the setter would fail unexpectedly.
+     * Based on feedback, we may want to try to make effects more malleable
+     * and/or provide an advanced api for manipulating them.
+     * Also consider adding warnings when an effect cannot be changed.
+     *
+     * @param {HTMLElement} proto Element class prototype to add accessors
+     *   and effects to
+     * @param {string} name Name of the property.
+     * @param {Object} info Info object from which to create property effects.
+     * Supported keys:
+     * @param {Object} allProps Flattened map of all properties defined in this
+     *   element (including inherited properties)
+     * @private
+     */
+    function createPropertyFromConfig(proto, name, info, allProps) {
+      // computed forces readOnly...
+      if (info.computed) {
+        info.readOnly = true;
+      }
+      // Note, since all computed properties are readOnly, this prevents
+      // adding additional computed property effects (which leads to a confusing
+      // setup where multiple triggers for setting a property)
+      // While we do have `hasComputedEffect` this is set on the property's
+      // dependencies rather than itself.
+      if (info.computed  && !proto._hasReadOnlyEffect(name)) {
+        proto._createComputedProperty(name, info.computed, allProps);
+      }
+      if (info.readOnly && !proto._hasReadOnlyEffect(name)) {
+        proto._createReadOnlyProperty(name, !info.computed);
+      }
+      if (info.reflectToAttribute && !proto._hasReflectEffect(name)) {
+        proto._createReflectedProperty(name);
+      }
+      if (info.notify && !proto._hasNotifyEffect(name)) {
+        proto._createNotifyingProperty(name);
+      }
+      // always add observer
+      if (info.observer) {
+        proto._createPropertyObserver(name, info.observer, allProps[info.observer]);
+      }
+    }
+
+    /**
+     * Configures an element `proto` to function with a given `template`.
+     * The element name `is` and extends `ext` must be specified for ShadyCSS
+     * style scoping.
+     *
+     * @param {HTMLElement} proto Element class prototype to add accessors
+     *   and effects to
+     * @param {HTMLTemplateElement} template Template to process and bind
+     * @param {string} baseURI URL against which to resolve urls in
+     *   style element cssText
+     * @param {string} is Tag name (or type extension name) for this element
+     * @param {string=} ext For type extensions, the tag name that was extended
+     * @private
+     */
+    function finalizeTemplate(proto, template, baseURI, is, ext) {
+      // support `include="module-name"`
+      let cssText =
+        Polymer.StyleGather.cssFromTemplate(template, baseURI) +
+        Polymer.StyleGather.cssFromModuleImports(is);
+      if (cssText) {
+        let style = document.createElement('style');
+        style.textContent = cssText;
+        template.content.insertBefore(style, template.content.firstChild);
+      }
+      if (window.ShadyCSS) {
+        window.ShadyCSS.prepareTemplate(template, is, ext);
+      }
+      proto._bindTemplate(template);
+    }
+
+    /**
+     * @polymerMixinClass
+     * @unrestricted
+     * @implements {Polymer_ElementMixin}
+     */
+    class PolymerElement extends polymerElementBase {
+
+      /**
+       * Standard Custom Elements V1 API.  The default implementation returns
+       * a list of dash-cased attributes based on a flattening of all properties
+       * declared in `static get properties()` for this element and any
+       * superclasses.
+       *
+       * @return {Array} Observed attribute list
+       */
+      static get observedAttributes() {
+        if (!this.hasOwnProperty(JSCompiler_renameProperty('__observedAttributes', this))) {
+          let list = [];
+          let properties = propertiesForClass(this);
+          for (let prop in properties) {
+            list.push(Polymer.CaseMap.camelToDashCase(prop));
+          }
+          this.__observedAttributes = list;
+        }
+        return this.__observedAttributes;
+      }
+
+      /**
+       * Called automatically when the first element instance is created to
+       * ensure that class finalization work has been completed.
+       * May be called by users to eagerly perform class finalization work
+       * prior to the creation of the first element instance.
+       *
+       * Class finalization work generally includes meta-programming such as
+       * creating property accessors and any property effect metadata needed for
+       * the features used.
+       *
+       * @public
+       */
+      static finalize() {
+        if (!hasClassFinalized(this)) {
+          finalizeClassAndSuper(this);
+        }
+      }
+
+      /**
+       * Returns the template that will be stamped into this element's shadow root.
+       *
+       * If a `static get is()` getter is defined, the default implementation
+       * will return the first `<template>` in a `dom-module` whose `id`
+       * matches this element's `is`.
+       *
+       * Users may override this getter to return an arbitrary template
+       * (in which case the `is` getter is unnecessary). The template returned
+       * may be either an `HTMLTemplateElement` or a string that will be
+       * automatically parsed into a template.
+       *
+       * Note that when subclassing, if the super class overrode the default
+       * implementation and the subclass would like to provide an alternate
+       * template via a `dom-module`, it should override this getter and
+       * return `Polymer.DomModule.import(this.is, 'template')`.
+       *
+       * If a subclass would like to modify the super class template, it should
+       * clone it rather than modify it in place.  If the getter does expensive
+       * work such as cloning/modifying a template, it should memoize the
+       * template for maximum performance:
+       *
+       *   let memoizedTemplate;
+       *   class MySubClass extends MySuperClass {
+       *     static get template() {
+       *       if (!memoizedTemplate) {
+       *         memoizedTemplate = super.template.cloneNode(true);
+       *         let subContent = document.createElement('div');
+       *         subContent.textContent = 'This came from MySubClass';
+       *         memoizedTemplate.content.appendChild(subContent);
+       *       }
+       *       return memoizedTemplate;
+       *     }
+       *   }
+       *
+       * @return {HTMLTemplateElement|string} Template to be stamped
+       */
+      static get template() {
+        if (!this.hasOwnProperty(JSCompiler_renameProperty('_template', this))) {
+          this._template = Polymer.DomModule.import(this.is, 'template') ||
+            // note: implemented so a subclass can retrieve the super
+            // template; call the super impl this way so that `this` points
+            // to the superclass.
+            Object.getPrototypeOf(this.prototype).constructor.template;
+        }
+        return this._template;
+      }
+
+      /**
+       * Path matching the url from which the element was imported.
+       * This path is used to resolve url's in template style cssText.
+       * The `importPath` property is also set on element instances and can be
+       * used to create bindings relative to the import path.
+       * Defaults to the path matching the url containing a `dom-module` element
+       * matching this element's static `is` property.
+       * Note, this path should contain a trailing `/`.
+       *
+       * @return {string} The import path for this element class
+       */
+      static get importPath() {
+        if (!this.hasOwnProperty(JSCompiler_renameProperty('_importPath', this))) {
+            const module = Polymer.DomModule.import(this.is);
+            this._importPath = module ? module.assetpath : '' ||
+            Object.getPrototypeOf(this.prototype).constructor.importPath;
+        }
+        return this._importPath;
+      }
+
+      /**
+       * Overrides the default `Polymer.PropertyAccessors` to ensure class
+       * metaprogramming related to property accessors and effects has
+       * completed (calls `finalize`).
+       *
+       * It also initializes any property defaults provided via `value` in
+       * `properties` metadata.
+       *
+       * @override
+       */
+      _initializeProperties() {
+        Polymer.telemetry.instanceCount++;
+        this.constructor.finalize();
+        const importPath = this.constructor.importPath;
+        // note: finalize template when we have access to `localName` to
+        // avoid dependence on `is` for polyfilling styling.
+        if (this._template && !this._template.__polymerFinalized) {
+          this._template.__polymerFinalized = true;
+          const baseURI =
+            importPath ? Polymer.ResolveUrl.resolveUrl(importPath) : '';
+          finalizeTemplate(this.__proto__, this._template, baseURI,
+            this.localName);
+        }
+        super._initializeProperties();
+        // set path defaults
+        this.rootPath = Polymer.rootPath;
+        this.importPath = importPath;
+        // apply property defaults...
+        let p$ = propertyDefaultsForClass(this.constructor);
+        if (!p$) {
+          return;
+        }
+        for (let p in p$) {
+          let info = p$[p];
+          // Don't set default value if there is already an own property, which
+          // happens when a `properties` property with default but no effects had
+          // a property set (e.g. bound) by its host before upgrade
+          if (!this.hasOwnProperty(p)) {
+            let value = typeof info.value == 'function' ?
+              info.value.call(this) :
+              info.value;
+            // Set via `_setProperty` if there is an accessor, to enable
+            // initializing readOnly property defaults
+            if (this._hasAccessor(p)) {
+              this._setPendingProperty(p, value, true);
+            } else {
+              this[p] = value;
+            }
+          }
+        }
+      }
+
+      /**
+       * Provides a default implementation of the standard Custom Elements
+       * `connectedCallback`.
+       *
+       * The default implementation enables the property effects system and
+       * flushes any pending properties, and updates shimmed CSS properties
+       * when using the ShadyCSS scoping/custom properties polyfill.
+       *
+       * @override
+       */
+      connectedCallback() {
+        if (window.ShadyCSS && this._template) {
+          window.ShadyCSS.styleElement(this);
+        }
+        this._enableProperties();
+      }
+
+      /**
+       * Provides a default implementation of the standard Custom Elements
+       * `disconnectedCallback`.
+       *
+       * @override
+       */
+      disconnectedCallback() {}
+
+      /**
+       * Stamps the element template.
+       *
+       * @override
+       */
+      ready() {
+        if (this._template) {
+          this.root = this._stampTemplate(this._template);
+          this.$ = this.root.$;
+        }
+        super.ready();
+      }
+
+      /**
+       * Implements `PropertyEffects`'s `_readyClients` call. Attaches
+       * element dom by calling `_attachDom` with the dom stamped from the
+       * element's template via `_stampTemplate`. Note that this allows
+       * client dom to be attached to the element prior to any observers
+       * running.
+       *
+       * @override
+       */
+      _readyClients() {
+        if (this._template) {
+          this.root = this._attachDom(this.root);
+        }
+        // The super._readyClients here sets the clients initialized flag.
+        // We must wait to do this until after client dom is created/attached
+        // so that this flag can be checked to prevent notifications fired
+        // during this process from being handled before clients are ready.
+        super._readyClients();
+      }
+
+
+      /**
+       * Attaches an element's stamped dom to itself. By default,
+       * this method creates a `shadowRoot` and adds the dom to it.
+       * However, this method may be overridden to allow an element
+       * to put its dom in another location.
+       *
+       * @throws {Error}
+       * @suppress {missingReturn}
+       * @param {NodeList} dom to attach to the element.
+       * @return {Node} node to which the dom has been attached.
+       */
+      _attachDom(dom) {
+        if (this.attachShadow) {
+          if (dom) {
+            if (!this.shadowRoot) {
+              this.attachShadow({mode: 'open'});
+            }
+            this.shadowRoot.appendChild(dom);
+            return this.shadowRoot;
+          }
+        } else {
+          throw new Error('ShadowDOM not available. ' +
+            // TODO(sorvell): move to compile-time conditional when supported
+          'Polymer.Element can create dom as children instead of in ' +
+          'ShadowDOM by setting `this.root = this;\` before \`ready\`.');
+        }
+      }
+
+      /**
+       * Provides a default implementation of the standard Custom Elements
+       * `attributeChangedCallback`.
+       *
+       * By default, attributes declared in `properties` metadata are
+       * deserialized using their `type` information to properties of the
+       * same name.  "Dash-cased" attributes are deserialzed to "camelCase"
+       * properties.
+       *
+       * @override
+       */
+      attributeChangedCallback(name, old, value) {
+        if (old !== value) {
+          let property = caseMap.dashToCamelCase(name);
+          let type = propertiesForClass(this.constructor)[property].type;
+          if (!this._hasReadOnlyEffect(property)) {
+            this._attributeToProperty(name, value, type);
+          }
+        }
+      }
+
+      /**
+       * When using the ShadyCSS scoping and custom property shim, causes all
+       * shimmed styles in this element (and its subtree) to be updated
+       * based on current custom property values.
+       *
+       * The optional parameter overrides inline custom property styles with an
+       * object of properties where the keys are CSS properties, and the values
+       * are strings.
+       *
+       * Example: `this.updateStyles({'--color': 'blue'})`
+       *
+       * These properties are retained unless a value of `null` is set.
+       *
+       * @param {Object=} properties Bag of custom property key/values to
+       *   apply to this element.
+       */
+      updateStyles(properties) {
+        if (window.ShadyCSS) {
+          window.ShadyCSS.styleSubtree(this, properties);
+        }
+      }
+
+      /**
+       * Rewrites a given URL relative to a base URL. The base URL defaults to
+       * the original location of the document containing the `dom-module` for
+       * this element. This method will return the same URL before and after
+       * bundling.
+       *
+       * @param {string} url URL to resolve.
+       * @param {string=} base Optional base URL to resolve against, defaults
+       * to the element's `importPath`
+       * @return {string} Rewritten URL relative to base
+       */
+      resolveUrl(url, base) {
+        if (!base && this.importPath) {
+          base = Polymer.ResolveUrl.resolveUrl(this.importPath);
+        }
+        return Polymer.ResolveUrl.resolveUrl(url, base);
+      }
+
+      /**
+       * Overrides `PropertyAccessors` to add map of dynamic functions on
+       * template info, for consumption by `PropertyEffects` template binding
+       * code. This map determines which method templates should have accessors
+       * created for them.
+       *
+       * @override
+       */
+      static _parseTemplateContent(template, templateInfo, nodeInfo) {
+        templateInfo.dynamicFns = templateInfo.dynamicFns || propertiesForClass(this);
+        return super._parseTemplateContent(template, templateInfo, nodeInfo);
+      }
+
+    }
+
+    return PolymerElement;
+  });
+
+  /**
+   * Provides basic tracking of element definitions (registrations) and
+   * instance counts.
+   *
+   * @namespace
+   * @summary Provides basic tracking of element definitions (registrations) and
+   * instance counts.
+   */
+  Polymer.telemetry = {
+    /**
+     * Total number of Polymer element instances created.
+     * @type {number}
+     */
+    instanceCount: 0,
+    /**
+     * Array of Polymer element classes that have been finalized.
+     * @type {Array<Polymer.Element>}
+     */
+    registrations: [],
+    /**
+     * @param {HTMLElement} prototype Element prototype to log
+     * @private
+     */
+    _regLog: function(prototype) {
+      console.log('[' + prototype.is + ']: registered')
+    },
+    /**
+     * Registers a class prototype for telemetry purposes.
+     * @param {HTMLElement} prototype Element prototype to register
+     * @protected
+     */
+    register: function(prototype) {
+      this.registrations.push(prototype);
+      Polymer.log && this._regLog(prototype);
+    },
+    /**
+     * Logs all elements registered with an `is` to the console.
+     * @public
+     */
+    dumpRegistrations: function() {
+      this.registrations.forEach(this._regLog);
+    }
+  };
+
+  /**
+   * When using the ShadyCSS scoping and custom property shim, causes all
+   * shimmed `styles` (via `custom-style`) in the document (and its subtree)
+   * to be updated based on current custom property values.
+   *
+   * The optional parameter overrides inline custom property styles with an
+   * object of properties where the keys are CSS properties, and the values
+   * are strings.
+   *
+   * Example: `Polymer.updateStyles({'--color': 'blue'})`
+   *
+   * These properties are retained unless a value of `null` is set.
+   *
+   * @param {Object=} props Bag of custom property key/values to
+   *   apply to the document.
+   */
+  Polymer.updateStyles = function(props) {
+    if (window.ShadyCSS) {
+      window.ShadyCSS.styleDocument(props);
+    }
+  };
+
+  /**
+   * Globally settable property that is automatically assigned to
+   * `Polymer.ElementMixin` instances, useful for binding in templates to
+   * make URL's relative to an application's root.  Defaults to the main
+   * document URL, but can be overridden by users.  It may be useful to set
+   * `Polymer.rootPath` to provide a stable application mount path when
+   * using client side routing.
+   *
+   * @memberof Polymer
+   */
+  Polymer.rootPath = Polymer.rootPath ||
+    Polymer.ResolveUrl.pathFromUrl(document.baseURI || window.location.href);
+
+})();
+</script>