[Md Feedback] Add initial content/strings to feedback-container element.

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({

[Dan Beam, 2016/06/09 19:03:39]

this doesn't really do much yet, and you don't actually use i18n() any more so
maybe keep this normal DOM until you *need* shadow DOM / Polymer (these things
aren't free)

[apacible, 2016/06/09 21:01:35]

There are some feedback components that I plan to use dom-if on within this
element, which is why I started with Polymer here. I have a plan/schedule on
when to add which components, so would prefer to keep as is.

Let me know if you feel strongly otherwise.

+  is: 'feedback-container',
+
+  behaviors: [
+    I18nBehavior,
+  ],
+});