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diff --git a/src/http/static/viz/2/goog/events/listener.js b/src/http/static/viz/2/goog/events/listener.js
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+// Copyright 2005 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 Listener object.
+ * @see ../demos/events.html
+ */
+
+goog.provide('goog.events.Listener');
+
+goog.require('goog.events.ListenableKey');
+
+
+
+/**
+ * Simple class that stores information about a listener
+ * @param {function(?):?} listener Callback function.
+ * @param {Function} proxy Wrapper for the listener that patches the event.
+ * @param {EventTarget|goog.events.Listenable} src Source object for
+ *     the event.
+ * @param {string} type Event type.
+ * @param {boolean} capture Whether in capture or bubble phase.
+ * @param {Object=} opt_handler Object in whose context to execute the callback.
+ * @implements {goog.events.ListenableKey}
+ * @constructor
+ */
+goog.events.Listener = function(
+    listener, proxy, src, type, capture, opt_handler) {
+  if (goog.events.Listener.ENABLE_MONITORING) {
+    this.creationStack = new Error().stack;
+  }
+
+  /** @override */
+  this.listener = listener;
+
+  /**
+   * A wrapper over the original listener. This is used solely to
+   * handle native browser events (it is used to simulate the capture
+   * phase and to patch the event object).
+   * @type {Function}
+   */
+  this.proxy = proxy;
+
+  /**
+   * Object or node that callback is listening to
+   * @type {EventTarget|goog.events.Listenable}
+   */
+  this.src = src;
+
+  /**
+   * The event type.
+   * @const {string}
+   */
+  this.type = type;
+
+  /**
+   * Whether the listener is being called in the capture or bubble phase
+   * @const {boolean}
+   */
+  this.capture = !!capture;
+
+  /**
+   * Optional object whose context to execute the listener in
+   * @type {Object|undefined}
+   */
+  this.handler = opt_handler;
+
+  /**
+   * The key of the listener.
+   * @const {number}
+   * @override
+   */
+  this.key = goog.events.ListenableKey.reserveKey();
+
+  /**
+   * Whether to remove the listener after it has been called.
+   * @type {boolean}
+   */
+  this.callOnce = false;
+
+  /**
+   * Whether the listener has been removed.
+   * @type {boolean}
+   */
+  this.removed = false;
+};
+
+
+/**
+ * @define {boolean} Whether to enable the monitoring of the
+ *     goog.events.Listener instances. Switching on the monitoring is only
+ *     recommended for debugging because it has a significant impact on
+ *     performance and memory usage. If switched off, the monitoring code
+ *     compiles down to 0 bytes.
+ */
+goog.define('goog.events.Listener.ENABLE_MONITORING', false);
+
+
+/**
+ * If monitoring the goog.events.Listener instances is enabled, stores the
+ * creation stack trace of the Disposable instance.
+ * @type {string}
+ */
+goog.events.Listener.prototype.creationStack;
+
+
+/**
+ * Marks this listener as removed. This also remove references held by
+ * this listener object (such as listener and event source).
+ */
+goog.events.Listener.prototype.markAsRemoved = function() {
+  this.removed = true;
+  this.listener = null;
+  this.proxy = null;
+  this.src = null;
+  this.handler = null;
+};