Update charted to 0.4.8 and roll

packages/web_components/lib/CustomElements.js

 /**
  * @license
  * 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
  */
-// @version 0.7.21
+// @version 0.7.23
 if (typeof WeakMap === "undefined") {
   (function() {
     var defineProperty = Object.defineProperty;
     var counter = Date.now() % 1e9;
     var WeakMap = function() {
       this.name = "__st" + (Math.random() * 1e9 >>> 0) + (counter++ + "__");
     };
     WeakMap.prototype = {
       set: function(key, value) {
         var entry = key[this.name];
@@ skipping 323 matching lines @@
   };
   global.JsMutationObserver = JsMutationObserver;
   if (!global.MutationObserver) {
     global.MutationObserver = JsMutationObserver;
     JsMutationObserver._isPolyfilled = true;
   }
 })(self);
 
 (function(scope) {
   "use strict";
-  if (!window.performance) {
+  if (!(window.performance && window.performance.now)) {
     var start = Date.now();
     window.performance = {
       now: function() {
         return Date.now() - start;
       }
     };
   }
   if (!window.requestAnimationFrame) {
     window.requestAnimationFrame = function() {
       var nativeRaf = window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
@@ skipping 406 matching lines @@
     if (isReservedTag(name)) {
       throw new Error("Failed to execute 'registerElement' on 'Document': Registration failed for type '" + String(name) + "'. The type name is invalid.");
     }
     if (getRegisteredDefinition(name)) {
       throw new Error("DuplicateDefinitionError: a type with name '" + String(name) + "' is already registered");
     }
     if (!definition.prototype) {
       definition.prototype = Object.create(HTMLElement.prototype);
     }
     definition.__name = name.toLowerCase();
+    if (definition.extends) {
+      definition.extends = definition.extends.toLowerCase();
+    }
     definition.lifecycle = definition.lifecycle || {};
     definition.ancestry = ancestry(definition.extends);
     resolveTagName(definition);
     resolvePrototypeChain(definition);
     overrideAttributeApi(definition.prototype);
     registerDefinition(definition.__name, definition);
     definition.ctor = generateConstructor(definition);
     definition.ctor.prototype = definition.prototype;
     definition.prototype.constructor = definition.ctor;
     if (scope.ready) {
@@ skipping 152 matching lines @@
   function wrapDomMethodToForceUpgrade(obj, methodName) {
     var orig = obj[methodName];
     obj[methodName] = function() {
       var n = orig.apply(this, arguments);
       upgradeAll(n);
       return n;
     };
   }
   wrapDomMethodToForceUpgrade(Node.prototype, "cloneNode");
   wrapDomMethodToForceUpgrade(document, "importNode");
-  if (isIE) {
-    (function() {
-      var importNode = document.importNode;
-      document.importNode = function() {
-        var n = importNode.apply(document, arguments);
-        if (n.nodeType == n.DOCUMENT_FRAGMENT_NODE) {
-          var f = document.createDocumentFragment();
-          f.appendChild(n);
-          return f;
-        } else {
-          return n;
-        }
-      };
-    })();
-  }
   document.registerElement = register;
   document.createElement = createElement;
   document.createElementNS = createElementNS;
   scope.registry = registry;
   scope.instanceof = isInstance;
   scope.reservedTagList = reservedTagList;
   scope.getRegisteredDefinition = getRegisteredDefinition;
   document.register = document.registerElement;
 });
 
@@ skipping 54 matching lines @@
   }
   if (document.readyState === "complete" || scope.flags.eager) {
     bootstrap();
   } else if (document.readyState === "interactive" && !window.attachEvent && (!window.HTMLImports || window.HTMLImports.ready)) {
     bootstrap();
   } else {
     var loadEvent = window.HTMLImports && !window.HTMLImports.ready ? "HTMLImportsLoaded" : "DOMContentLoaded";
     window.addEventListener(loadEvent, bootstrap);
   }
 })(window.CustomElements);