ntp: add tooltips for all tile types

chrome/browser/resources/ntp4/bookmarks_page.js

 // Copyright (c) 2011 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('ntp4', function() {
   'use strict';
 
   var localStrings = new LocalStrings;
 
   /**
@@ skipping 50 matching lines @@
     /**
      * Initialize the bookmark object.
      */
     initialize: function() {
       var id = tileId++;
       this.id = 'bookmark_tile_' + id;
 
       var title = this.querySelector('.title');
       title.textContent = this.data.title;
 
+      // Sets the tooltip.
+      this.title = this.data.title;
+
       if (this.data.url) {
         var button = this.querySelector('.button');
         button.href = title.href = this.data.url;
       }
 
       var faviconDiv = this.querySelector('.favicon');
       var faviconUrl;
       if (this.data.url) {
         faviconUrl = 'chrome://favicon/size/16/' + this.data.url;
         chrome.send('getFaviconDominantColor', [faviconUrl, this.id]);
@@ skipping 512 matching lines @@
       tile.stripeColor = color;
   }
 
   return {
     BookmarksPage: BookmarksPage,
     initBookmarkChevron: initBookmarkChevron,
   };
 });
 
 window.addEventListener('load', ntp4.initBookmarkChevron);