[ntp4] Include a helper link for importing bookmarks if the user doesn't have any.

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 279 matching lines @@
       link.href = 'chrome://bookmarks/#' + this.id;
 
       var wrapper = $('bookmarks-bottom-link-wrapper');
       if (items.length > MAX_BOOKMARK_TILES) {
         var link = wrapper.querySelector('a');
         link.href = 'chrome://bookmarks/#' + this.id;
         wrapper.hidden = false;
       } else {
         wrapper.hidden = true;
       }
+
+      if (this.id === ROOT_NODE_ID && !tile_count) {
+        var importTemplate = $('bookmarks-import-data-link-wrapper');
+        var importWrapper = importTemplate.cloneNode(true);
+        importWrapper.hidden = false;
+        this.querySelector('.tile-page-content').appendChild(importWrapper);

[Evan Stade, 2011/09/07 03:55:21]

don't you need to remove it at some point (if the user adds a bookmark for
example)

[csilv, 2011/09/07 06:11:14]

Yup, for add.  Done.

+      }
     },
 
     /**
      * Determine whether a bookmark ID matches a folder in the current
      * hierarchy.
      * @param {string} id The bookmark ID to search for.
      * @private
      */
     isBookmarkInParentHierarchy_: function(id) {
       var titlesWrapper = $('bookmarks-title-wrapper');
@@ skipping 283 matching lines @@
       tile.stripeColor = color;
   }
 
   return {
     BookmarksPage: BookmarksPage,
     initBookmarkChevron: initBookmarkChevron,
   };
 });
 
 window.addEventListener('load', ntp4.initBookmarkChevron);