Added base template for config ui.

appengine/config_service/ui/bower_components/polymer/lib/utils/async.html

+<!--
+@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="boot.html">
+
+<script>
+(function() {
+
+  'use strict';
+
+  /** @typedef {{run: function(function(), number=):number, cancel: function(number)}} */
+  let AsyncInterface; // eslint-disable-line no-unused-vars
+
+  // Microtask implemented using Mutation Observer
+  let microtaskCurrHandle = 0;
+  let microtaskLastHandle = 0;
+  let microtaskCallbacks = [];
+  let microtaskNodeContent = 0;
+  let microtaskNode = document.createTextNode('');
+  new window.MutationObserver(microtaskFlush).observe(microtaskNode, {characterData: true});
+
+  function microtaskFlush() {
+    const len = microtaskCallbacks.length;
+    for (let i = 0; i < len; i++) {
+      let cb = microtaskCallbacks[i];
+      if (cb) {
+        try {
+          cb();
+        } catch (e) {
+          setTimeout(() => { throw e });
+        }
+      }
+    }
+    microtaskCallbacks.splice(0, len);
+    microtaskLastHandle += len;
+  }
+
+  /**
+   * Module that provides a number of strategies for enqueuing asynchronous
+   * tasks.  Each sub-module provides a standard `run(fn)` interface that returns a
+   * handle, and a `cancel(handle)` interface for canceling async tasks before
+   * they run.
+   *
+   * @namespace
+   * @memberof Polymer
+   * @summary Module that provides a number of strategies for enqueuing asynchronous
+   * tasks.
+   */
+  Polymer.Async = {
+
+    /**
+     * Async interface wrapper around `setTimeout`.
+     *
+     * @namespace
+     * @memberof Polymer.Async
+     * @summary Async interface wrapper around `setTimeout`.
+     */
+    timeOut: {
+      /**
+       * Returns a sub-module with the async interface providing the provided
+       * delay.
+       *
+       * @memberof Polymer.Async.timeOut
+       * @param {number} delay Time to wait before calling callbacks in ms
+       * @return {AsyncInterface} An async timeout interface
+       */
+      after(delay) {
+        return  {
+          run(fn) { return setTimeout(fn, delay) },
+          cancel: window.clearTimeout.bind(window)
+        }
+      },
+      /**
+       * Enqueues a function called in the next task.
+       *
+       * @memberof Polymer.Async.timeOut
+       * @param {Function} fn Callback to run
+       * @return {number} Handle used for canceling task
+       */
+      run: window.setTimeout.bind(window),
+      /**
+       * Cancels a previously enqueued `timeOut` callback.
+       *
+       * @memberof Polymer.Async.timeOut
+       * @param {number} handle Handle returned from `run` of callback to cancel
+       */
+      cancel: window.clearTimeout.bind(window)
+    },
+
+    /**
+     * Async interface wrapper around `requestAnimationFrame`.
+     *
+     * @namespace
+     * @memberof Polymer.Async
+     * @summary Async interface wrapper around `requestAnimationFrame`.
+     */
+    animationFrame: {
+      /**
+       * Enqueues a function called at `requestAnimationFrame` timing.
+       *
+       * @memberof Polymer.Async.animationFrame
+       * @param {Function} fn Callback to run
+       * @return {number} Handle used for canceling task
+       */
+      run: window.requestAnimationFrame.bind(window),
+      /**
+       * Cancels a previously enqueued `animationFrame` callback.
+       *
+       * @memberof Polymer.Async.timeOut
+       * @param {number} handle Handle returned from `run` of callback to cancel
+       */
+      cancel: window.cancelAnimationFrame.bind(window)
+    },
+
+    /**
+     * Async interface wrapper around `requestIdleCallback`.  Falls back to
+     * `setTimeout` on browsers that do not support `requestIdleCallback`.
+     *
+     * @namespace
+     * @memberof Polymer.Async
+     * @summary Async interface wrapper around `requestIdleCallback`.
+     */
+    idlePeriod: {
+      /**
+       * Enqueues a function called at `requestIdleCallback` timing.
+       *
+       * @memberof Polymer.Async.idlePeriod
+       * @param {function(IdleDeadline)} fn Callback to run
+       * @return {number} Handle used for canceling task
+       */
+      run(fn) {
+        return window.requestIdleCallback ?
+          window.requestIdleCallback(fn) :
+          window.setTimeout(fn, 16);
+      },
+      /**
+       * Cancels a previously enqueued `idlePeriod` callback.
+       *
+       * @memberof Polymer.Async.idlePeriod
+       * @param {number} handle Handle returned from `run` of callback to cancel
+       */
+      cancel(handle) {
+        window.cancelIdleCallback ?
+          window.cancelIdleCallback(handle) :
+          window.clearTimeout(handle);
+      }
+    },
+
+    /**
+     * Async interface for enqueueing callbacks that run at microtask timing.
+     *
+     * Note that microtask timing is achieved via a single `MutationObserver`,
+     * and thus callbacks enqueued with this API will all run in a single
+     * batch, and not interleaved with other microtasks such as promises.
+     * Promises are avoided as an implementation choice for the time being
+     * due to Safari bugs that cause Promises to lack microtask guarantees.
+     *
+     * @namespace
+     * @memberof Polymer.Async
+     * @summary Async interface for enqueueing callbacks that run at microtask
+     *   timing.
+     */
+    microTask: {
+
+      /**
+       * Enqueues a function called at microtask timing.
+       *
+       * @memberof Polymer.Async.microTask
+       * @param {Function} callback Callback to run
+       * @return {*} Handle used for canceling task
+       */
+      run(callback) {
+        microtaskNode.textContent = microtaskNodeContent++;
+        microtaskCallbacks.push(callback);
+        return microtaskCurrHandle++;
+      },
+
+      /**
+       * Cancels a previously enqueued `microTask` callback.
+       *
+       * @memberof Polymer.Async.microTask
+       * @param {number} handle Handle returned from `run` of callback to cancel
+       */
+      cancel(handle) {
+        const idx = handle - microtaskLastHandle;
+        if (idx >= 0) {
+          if (!microtaskCallbacks[idx]) {
+            throw new Error('invalid async handle: ' + handle);
+          }
+          microtaskCallbacks[idx] = null;
+        }
+      }
+
+    }
+  };
+
+})();
+</script>