[Md Feedback] Add initial data population for dialog.

chrome/browser/resources/md_feedback/feedback_container.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This Polymer element is used as a container for all the feedback
 // elements. Based on a number of factors, it determines which elements
 // to show and what will be submitted to the feedback servers.
 Polymer({
   is: 'feedback-container',
 
+  properties: {
+    /**
+     * The user's email, if available.
+     * @type {string|undefined}
+     */
+    email: {
+      type: String,
+    },
+
+    /**
+     * The URL of the page the user was on before sending feedback.
+     * @type {string|undefined}
+     */
+    url: {
+      type: String,
+    },
+  },
+
   /**
    * Retrieves the feedback privacy note text, if it exists. On non-officially
    * branded builds, the string is not defined.
    *
    * @return {string} Privacy note text.
    */
   getPrivacyNote_: function() {
     return loadTimeData.valueExists('privacyNote') ?
         this.i18n('privacyNote') : '';

[afakhry, 2016/08/03 23:56:01]

This generates the following error:

Uncaught TypeError: this.i18n is not a function.

I fixed this by adding:
behaviors: [I18nBehavior],
before Properties: {

and included
<link rel="import" href="chrome://resources/html/i18n_behavior.html">

in the html file.

[apacible, 2016/08/11 18:50:33]

Done.

   },
 });