[Md Feedback] Add initial data population for dialog.

chrome/browser/resources/md_feedback/feedback_container.html

Index: chrome/browser/resources/md_feedback/feedback_container.html
diff --git a/chrome/browser/resources/md_feedback/feedback_container.html b/chrome/browser/resources/md_feedback/feedback_container.html
index acb0772dd82f0855301bad1b7a44c57d72383d13..08aab2d1e88f8485c9833728bef243a38cd1eda5 100644
--- a/chrome/browser/resources/md_feedback/feedback_container.html
+++ b/chrome/browser/resources/md_feedback/feedback_container.html
@@ -20,8 +20,8 @@
     </div>
     <div>
       <paper-textarea label="$i18n{openEndedLabel}"></paper-textarea>
-      <paper-input label="$i18n{urlLabel}"></paper-input>
-      <paper-input label="$i18n{emailLabel}"></paper-input>
+      <paper-input label="$i18n{urlLabel}" placeholder="[[url]]"></paper-input>
+      <paper-input label="$i18n{emailLabel}" placeholder="[[email]]"></paper-input>
     </div>
     <div>
       <paper-checkbox>$i18n{includeScreenshotLabel}</paper-checkbox>