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diff --git a/assets/viz/2/goog/fs/url.js b/assets/viz/2/goog/fs/url.js
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+// Copyright 2015 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Wrapper for URL and its createObjectUrl and revokeObjectUrl
+ * methods that are part of the HTML5 File API.
+ */
+
+goog.provide('goog.fs.url');
+
+
+/**
+ * Creates a blob URL for a blob object.
+ * Throws an error if the browser does not support Object Urls.
+ *
+ * @param {!Blob} blob The object for which to create the URL.
+ * @return {string} The URL for the object.
+ */
+goog.fs.url.createObjectUrl = function(blob) {
+  return goog.fs.url.getUrlObject_().createObjectURL(blob);
+};
+
+
+/**
+ * Revokes a URL created by {@link goog.fs.url.createObjectUrl}.
+ * Throws an error if the browser does not support Object Urls.
+ *
+ * @param {string} url The URL to revoke.
+ */
+goog.fs.url.revokeObjectUrl = function(url) {
+  goog.fs.url.getUrlObject_().revokeObjectURL(url);
+};
+
+
+/**
+ * @typedef {{createObjectURL: (function(!Blob): string),
+ *            revokeObjectURL: function(string): void}}
+ */
+goog.fs.url.UrlObject_;
+
+
+/**
+ * Get the object that has the createObjectURL and revokeObjectURL functions for
+ * this browser.
+ *
+ * @return {goog.fs.url.UrlObject_} The object for this browser.
+ * @private
+ */
+goog.fs.url.getUrlObject_ = function() {
+  var urlObject = goog.fs.url.findUrlObject_();
+  if (urlObject != null) {
+    return urlObject;
+  } else {
+    throw Error('This browser doesn\'t seem to support blob URLs');
+  }
+};
+
+
+/**
+ * Finds the object that has the createObjectURL and revokeObjectURL functions
+ * for this browser.
+ *
+ * @return {?goog.fs.url.UrlObject_} The object for this browser or null if the
+ *     browser does not support Object Urls.
+ * @suppress {unnecessaryCasts} Depending on how the code is compiled, casting
+ *     goog.global to UrlObject_ may result in unnecessary cast warning.
+ *     However, the cast cannot be removed because with different set of
+ *     compiler flags, the cast is indeed necessary.  As such, silencing it.
+ * @private
+ */
+goog.fs.url.findUrlObject_ = function() {
+  // This is what the spec says to do
+  // http://dev.w3.org/2006/webapi/FileAPI/#dfn-createObjectURL
+  if (goog.isDef(goog.global.URL) &&
+      goog.isDef(goog.global.URL.createObjectURL)) {
+    return /** @type {goog.fs.url.UrlObject_} */ (goog.global.URL);
+    // This is what Chrome does (as of 10.0.648.6 dev)
+  } else if (
+      goog.isDef(goog.global.webkitURL) &&
+      goog.isDef(goog.global.webkitURL.createObjectURL)) {
+    return /** @type {goog.fs.url.UrlObject_} */ (goog.global.webkitURL);
+    // This is what the spec used to say to do
+  } else if (goog.isDef(goog.global.createObjectURL)) {
+    return /** @type {goog.fs.url.UrlObject_} */ (goog.global);
+  } else {
+    return null;
+  }
+};
+
+
+/**
+ * Checks whether this browser supports Object Urls. If not, calls to
+ * createObjectUrl and revokeObjectUrl will result in an error.
+ *
+ * @return {boolean} True if this browser supports Object Urls.
+ */
+goog.fs.url.browserSupportsObjectUrls = function() {
+  return goog.fs.url.findUrlObject_() != null;
+};