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diff --git a/chromium/third_party/catapult/third_party/polymer2/bower_components/polymer/types/lib/utils/flattened-nodes-observer.d.ts b/chromium/third_party/catapult/third_party/polymer2/bower_components/polymer/types/lib/utils/flattened-nodes-observer.d.ts
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+++ b/chromium/third_party/catapult/third_party/polymer2/bower_components/polymer/types/lib/utils/flattened-nodes-observer.d.ts
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+/**
+ * DO NOT EDIT
+ *
+ * This file was automatically generated by
+ *   https://github.com/Polymer/gen-typescript-declarations
+ *
+ * To modify these typings, edit the source file(s):
+ *   lib/utils/flattened-nodes-observer.html
+ */
+
+/// <reference path="boot.d.ts" />
+/// <reference path="array-splice.d.ts" />
+/// <reference path="async.d.ts" />
+
+declare namespace Polymer {
+
+  /**
+   * Class that listens for changes (additions or removals) to
+   * "flattened nodes" on a given `node`. The list of flattened nodes consists
+   * of a node's children and, for any children that are `<slot>` elements,
+   * the expanded flattened list of `assignedNodes`.
+   * For example, if the observed node has children `<a></a><slot></slot><b></b>`
+   * and the `<slot>` has one `<div>` assigned to it, then the flattened
+   * nodes list is `<a></a><div></div><b></b>`. If the `<slot>` has other
+   * `<slot>` elements assigned to it, these are flattened as well.
+   *
+   * The provided `callback` is called whenever any change to this list
+   * of flattened nodes occurs, where an addition or removal of a node is
+   * considered a change. The `callback` is called with one argument, an object
+   * containing an array of any `addedNodes` and `removedNodes`.
+   *
+   * Note: the callback is called asynchronous to any changes
+   * at a microtask checkpoint. This is because observation is performed using
+   * `MutationObserver` and the `<slot>` element's `slotchange` event which
+   * are asynchronous.
+   *
+   * An example:
+   * ```js
+   * class TestSelfObserve extends Polymer.Element {
+   *   static get is() { return 'test-self-observe';}
+   *   connectedCallback() {
+   *     super.connectedCallback();
+   *     this._observer = new Polymer.FlattenedNodesObserver(this, (info) => {
+   *       this.info = info;
+   *     });
+   *   }
+   *   disconnectedCallback() {
+   *     super.disconnectedCallback();
+   *     this._observer.disconnect();
+   *   }
+   * }
+   * customElements.define(TestSelfObserve.is, TestSelfObserve);
+   * ```
+   */
+  class FlattenedNodesObserver {
+
+    /**
+     * Returns the list of flattened nodes for the given `node`.
+     * This list consists of a node's children and, for any children
+     * that are `<slot>` elements, the expanded flattened list of `assignedNodes`.
+     * For example, if the observed node has children `<a></a><slot></slot><b></b>`
+     * and the `<slot>` has one `<div>` assigned to it, then the flattened
+     * nodes list is `<a></a><div></div><b></b>`. If the `<slot>` has other
+     * `<slot>` elements assigned to it, these are flattened as well.
+     *
+     * @param node The node for which to return the list of flattened nodes.
+     * @returns The list of flattened nodes for the given `node`.
+     */
+    static getFlattenedNodes(node: HTMLElement|HTMLSlotElement|null): any[]|null;
+
+    /**
+     * Activates an observer. This method is automatically called when
+     * a `FlattenedNodesObserver` is created. It should only be called to
+     * re-activate an observer that has been deactivated via the `disconnect` method.
+     */
+    connect(): void;
+
+    /**
+     * Deactivates the flattened nodes observer. After calling this method
+     * the observer callback will not be called when changes to flattened nodes
+     * occur. The `connect` method may be subsequently called to reactivate
+     * the observer.
+     */
+    disconnect(): void;
+
+    /**
+     * Flushes the observer causing any pending changes to be immediately
+     * delivered the observer callback. By default these changes are delivered
+     * asynchronously at the next microtask checkpoint.
+     *
+     * @returns Returns true if any pending changes caused the observer
+     * callback to run.
+     */
+    flush(): boolean;
+  }
+}