Add more features to ntp-tiles-internal

components/ntp_tiles/webui/resources/ntp_tiles_internals.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.
 
 cr.define('chrome.ntp_tiles_internals', function() {
   'use strict';
 
   var initialize = function() {
     receiveSites({});
 
     $('submit-update').addEventListener('click', function(event) {
       event.preventDefault();
       chrome.send('update', [{
         "popular": {
           "overrideURL": $('override-url').value,
           "overrideCountry": $('override-country').value,
           "overrideVersion": $('override-version').value,
         },
-      }])
+      }]);
+    });
+
+    $('suggestions-fetch').addEventListener('click', function(event) {
+      event.preventDefault();
+      chrome.send('fetchSuggestions');
+    });
+
+    $('popular-view-json').addEventListener('click', function(event) {
+      event.preventDefault();
+      if ($('popular-json-value').textContent === "") {
+        chrome.send('viewPopularSitesJson');
+      } else {
+        $('popular-json-value').textContent = "";
+      }
     });
 
     chrome.send('registerForEvents');
   }
 
   var receiveSourceInfo = function(state) {
     jstProcess(new JsEvalContext(state), $('sources'));
   }
 
   var receiveSites = function(sites) {
     jstProcess(new JsEvalContext(sites), $('sites'));
   }
 
   // Return an object with all of the exports.
   return {
     initialize: initialize,
     receiveSourceInfo: receiveSourceInfo,
     receiveSites: receiveSites,
   };
 });
 
 document.addEventListener('DOMContentLoaded',
                           chrome.ntp_tiles_internals.initialize);