[NTPSnippets] Switch from TickClock to Clock for storing the last background fetched time.

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 = [];
 
@@ skipping 15 matching lines @@
     $('last-json-dump').addEventListener('click', function(event) {
       downloadJson($('last-json-text').innerText);
       event.preventDefault();
     });
 
     $('clear-classification').addEventListener('click', function(event) {
       chrome.send('clearClassification');
       event.preventDefault();
     });
 
+    $('background-fetch-button').addEventListener('click', function(event) {
+      chrome.send('fetchRemoteSuggestionsInTheBackground');
+      event.preventDefault();
+    });
+
     window.addEventListener('focus', refreshContent);
     window.setInterval(refreshContent, 1000);
 
     refreshContent();
   }
 
   function receiveProperty(propertyId, value) {
     $(propertyId).textContent = value;
   }
 
@@ skipping 55 matching lines @@
   }
 
   function receiveClassification(
       userClass, timeToOpenNTP, timeToShow, timeToUse) {
     receiveProperty('user-class', userClass);
     receiveProperty('avg-time-to-open-ntp', timeToOpenNTP);
     receiveProperty('avg-time-to-show', timeToShow);
     receiveProperty('avg-time-to-use', timeToUse);
   }
 
+  function receiveLastRemoteSuggestionsBackgroundFetchTime(
+      lastRemoteSuggestionsBackgroundFetchTime) {
+    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.click();
   }
 
@@ skipping 29 matching lines @@
     }
   }
 
   // Return an object with all of the exports.
   return {
     initialize: initialize,
     receiveProperty: receiveProperty,
     receiveContentSuggestions: receiveContentSuggestions,
     receiveJson: receiveJson,
     receiveClassification: receiveClassification,
+    receiveLastRemoteSuggestionsBackgroundFetchTime:
+        receiveLastRemoteSuggestionsBackgroundFetchTime,
   };
 });
 
 document.addEventListener('DOMContentLoaded',
                           chrome.SnippetsInternals.initialize);