ntp-snippets-internals: add fields, indent JSON

chrome/browser/resources/snippets_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.SnippetsInternals', function() {
   'use strict';
 
   // Stores the list of suggestions we received in receiveContentSuggestions.
   var lastSuggestions = [];
 
   function initialize() {
     $('submit-download').addEventListener('click', function(event) {
       chrome.send('download');
       event.preventDefault();
     });
 
     $('submit-dump').addEventListener('click', function(event) {
-      downloadJson(JSON.stringify(lastSuggestions));
+      downloadJson(JSON.stringify(lastSuggestions, null, 2));
       event.preventDefault();
     });
 
     $('last-json-button').addEventListener('click', function(event) {
       $('last-json-container').classList.toggle('hidden');
     });
 
     $('last-json-dump').addEventListener('click', function(event) {
       downloadJson($('last-json-text').innerText);
       event.preventDefault();
@@ skipping 89 matching lines @@
     receiveProperty('last-background-fetch-time-label',
         lastRemoteSuggestionsBackgroundFetchTime);
   }
 
   function downloadJson(json) {
     // Redirect the browser to download data in |json| as a file "snippets.json"
     // (Setting Content-Disposition: attachment via a data: URL is not possible;
     // create a link with download attribute and simulate a click, instead.)
     var link = document.createElement('a');
     link.download = 'snippets.json';
-    link.href = 'data:,' + json;
+    link.href = 'data:application/json,' + encodeURI(json);
     link.click();
   }
 
   function refreshContent() {
     chrome.send('refreshContent');
   }
 
   function toggleHidden(event) {
     var id = event.currentTarget.getAttribute('hidden-id');
     $(id).classList.toggle('hidden');
@@ skipping 29 matching lines @@
     receiveContentSuggestions: receiveContentSuggestions,
     receiveJson: receiveJson,
     receiveClassification: receiveClassification,
     receiveLastRemoteSuggestionsBackgroundFetchTime:
         receiveLastRemoteSuggestionsBackgroundFetchTime,
   };
 });
 
 document.addEventListener('DOMContentLoaded',
                           chrome.SnippetsInternals.initialize);