Update charted to 0.4.8 and roll

packages/template_binding/lib/js/microtask.js

-/*
- * Copyright (c) 2014 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
- */
-
-(function(scope) {
-
-var iterations = 0;
-var callbacks = [];
-var twiddle = document.createTextNode('');
-
-function endOfMicrotask(callback) {
-  twiddle.textContent = iterations++;
-  callbacks.push(callback);
-}
-
-function atEndOfMicrotask() {
-  while (callbacks.length) {
-    callbacks.shift()();
-  }
-}
-
-new (window.MutationObserver || JsMutationObserver)(atEndOfMicrotask)
-  .observe(twiddle, {characterData: true})
-  ;
-
-// exports
-scope.endOfMicrotask = endOfMicrotask;
-// bc 
-Platform.endOfMicrotask = endOfMicrotask;
-
-})(Polymer);
-