Add initial version of chrome://popular-sites-internals page

chrome/browser/resources/popular_sites_internals.js

+// Copyright 2015 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('chrome.popular_sites_internals', function() {
+  'use strict';
+
+  function initialize() {
+    function submitDownload(event) {
+      $('download-result').textContent = '';
+      chrome.send('download', [$('country-input').value,
+                               $('version-input').value]);
+      event.preventDefault();
+    }
+
+    $('submit-download').addEventListener('click', submitDownload);
+
+    chrome.send('registerForEvents');
+  }
+
+  function receiveDownloadResult(result) {
+    $('download-result').textContent = result;
+  }
+
+  function receiveSites(sites) {
+    jstProcess(new JsEvalContext(sites), $('sites'));
+  }
+
+  // Return an object with all of the exports.
+  return {
+    initialize: initialize,
+    receiveDownloadResult: receiveDownloadResult,
+    receiveSites: receiveSites,
+  };
+});
+
+document.addEventListener('DOMContentLoaded',
+                          chrome.popular_sites_internals.initialize);
+