MD History: Add spinners when new data is loading or searching

chrome/browser/resources/md_history/history.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.
 
 // Send the history query immediately. This allows the query to process during
 // the initial page startup.
 chrome.send('queryHistory', ['', 0, 0, 0, RESULTS_PER_PAGE]);
 chrome.send('getForeignSessions');
 
 /**
@@ skipping 44 matching lines @@
   var historyList = /** @type {HistoryListElement} */($('history-list'));
   var toolbar = /** @type {HistoryToolbarElement} */($('toolbar'));
   var toBeRemoved = historyList.getSelectedItems(toolbar.count);
   chrome.send('removeVisits', toBeRemoved);
 });
 
 /**
  * When the search is changed refresh the results from the backend.
  */
 window.addEventListener('search-changed', function(e) {
-  /** @type {HistoryListElement} */($('history-list')).setLoading();
+  /** @type {HistoryListElement} */($('history-list')).setSearching();
   chrome.send('queryHistory', [e.detail.search, 0, 0, 0, RESULTS_PER_PAGE]);
 });
 
 /**
  * Switches between displaying history data and synced tabs data for the page.
  */
 window.addEventListener('switch-display', function(e) {
   $('history-synced-device-manager').hidden =
       e.detail.display != 'synced-tabs-button';
   $('history-list').hidden = e.detail.display != 'history-button';
@@ skipping 55 matching lines @@
  * Called by the history backend when the deletion failed.
  */
 function deleteFailed() {
 }
 
 /**
  * Called when the history is deleted by someone else.
  */
 function historyDeleted() {
 }