[Md Feedback] Add initial data population for dialog.

chrome/browser/resources/md_feedback/feedback_container.js

Index: chrome/browser/resources/md_feedback/feedback_container.js
diff --git a/chrome/browser/resources/md_feedback/feedback_container.js b/chrome/browser/resources/md_feedback/feedback_container.js
index 7caa6ab00318f7fa489f829ad5ebf3b98e956b2b..b4ac3eb8261c8cc6ca61109a312d49f524cf343a 100644
--- a/chrome/browser/resources/md_feedback/feedback_container.js
+++ b/chrome/browser/resources/md_feedback/feedback_container.js
@@ -8,6 +8,24 @@
 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.