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diff --git a/tools/addon-sdk-1.3/packages/api-utils/lib/events/assembler.js b/tools/addon-sdk-1.3/packages/api-utils/lib/events/assembler.js
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+/* vim:set ts=2 sw=2 sts=2 et: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (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.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Jetpack.
+ *
+ * The Initial Developer of the Original Code is
+ * the Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Irakli Gozalishvili <gozala@mozilla.com> (Original Author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+"use strict";
+
+const { Trait } = require("../light-traits");
+const { removeListener, on } = require("../dom/events");
+
+/**
+ * Trait may be used for building objects / composing traits that wish to handle
+ * multiple dom events from multiple event targets in one place. Event targets
+ * can be added / removed by calling `observe / ignore` methods. Composer should
+ * provide array of event types it wishes to handle as property
+ * `supportedEventsTypes` and function for handling all those events as
+ * `handleEvent` property.
+ */
+exports.DOMEventAssembler = Trait({
+  /**
+   * Function that is supposed to handle all the supported events (that are
+   * present in the `supportedEventsTypes`) from all the observed
+   * `eventTargets`.
+   * @param {Event} event
+   *    Event being dispatched.
+   */
+  handleEvent: Trait.required,
+  /**
+   * Array of supported event names.
+   * @type {String[]}
+   */
+  supportedEventsTypes: Trait.required,
+  /**
+   * Adds `eventTarget` to the list of observed `eventTarget`s. Listeners for
+   * supported events will be registered on the given `eventTarget`.
+   * @param {EventTarget} eventTarget
+   */
+  observe: function observe(eventTarget) {
+    this.supportedEventsTypes.forEach(function(eventType) {
+      on(eventTarget, eventType, this);
+    }, this);
+  },
+  /**
+   * Removes `eventTarget` from the list of observed `eventTarget`s. Listeners
+   * for all supported events will be unregistered from the given `eventTarget`.
+   * @param {EventTarget} eventTarget
+   */
+  ignore: function ignore(eventTarget) {
+    this.supportedEventsTypes.forEach(function(eventType) {
+      removeListener(eventTarget, eventType, this);
+    }, this);
+  }
+});