MD History: Round down timestamp used for incremental queries

chrome/browser/resources/md_history/list_container.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.
 
 Polymer({
   is: 'history-list-container',
 
   properties: {
     // The path of the currently selected page.
     selectedPage_: String,
@@ skipping 61 matching lines @@
     var dialog = this.$.dialog.getIfExists();
     if (!incremental && dialog && dialog.open)
       dialog.close();
 
     this.set('queryState.querying', true);
     this.set('queryState.incremental', incremental);
 
     var lastVisitTime = 0;
     if (incremental) {
       var lastVisit = this.queryResult.results.slice(-1)[0];
-      lastVisitTime = lastVisit ? lastVisit.time : 0;
+      lastVisitTime = lastVisit ? Math.floor(lastVisit.time) : 0;
     }
 
     var maxResults =
       this.groupedRange == HistoryRange.ALL_TIME ? RESULTS_PER_PAGE : 0;
     chrome.send('queryHistory', [
       queryState.searchTerm, queryState.groupedOffset, queryState.range,
       lastVisitTime, maxResults
     ]);
   },
 
@@ skipping 169 matching lines @@
         }.bind(this));
     menu.closeMenu();
   },
 
   /**
    * @return {HTMLElement}
    * @private
    */
   getSelectedList_: function() { return this.$.content.selectedItem; },
 });