Add internals page for DICE

chrome/browser/resources/signin/signin_dice_internals/signin_dice_internals.js

+/* Copyright 2017 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. */
+
+cr.define('signin.dice', function() {
+  'use strict';
+
+  function initialize() {
+    $('enableSyncButton').addEventListener('click', onEnableSync);
+  }
+
+  function onEnableSync(e) {
+    chrome.send('enableSync');
+  }
+
+  return {
+    initialize: initialize,
+  };
+});
+
+document.addEventListener('DOMContentLoaded', signin.dice.initialize);