[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 282 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)
+        this.showImportPromo_();
     },
 
     /**
      * 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 48 matching lines @@
 
     /**
      * Invoked when a node has been added.
      * @param {string} id The id of the newly created bookmark node.
      * @param {Object} bookmark The new bookmark node.
      * @param {boolean} fromCurrentPage True if the action was from this page.
      */
     bookmarkNodeAdded: function(id, bookmark, fromCurrentPage) {
       if (this.importing) return;
       if (this.currentlyInFolder_(bookmark.parentId)) {
+        // Hide the import promo if it exists.
+        this.hideImportPromo_();
         // If source of the add came from this page, show an animated insertion,
         // otherwise just quietly do it.
         this.addTileAt(new Bookmark(bookmark), bookmark.index, fromCurrentPage);
         this.repositionTiles_();
       }
     },
 
     /**
      * Invoked when the title or url of a node changes.
      * @param {string} id The id of the changed node.
@@ skipping 155 matching lines @@
         title = text || ('IMG' == img.nodeName && img.alt);
       }
       // If we *still* don't have a title, just use the URL.
       if (!title)
         title = url;
       // Create a bookmark for the dropped data.
       this.generateBookmarkForLink(parentId, index, title, url);
     },
 
     /**
+     * Show the 'Import bookmarks' promo

[Evan Stade, 2011/09/07 19:16:18]

.

[csilv, 2011/09/07 19:29:59]

Done.

+     * @private
+     */
+    showImportPromo_: function() {
+      var importTemplate = $('bookmarks-import-data-link-template');
+      var importWrapper = importTemplate.cloneNode(true);
+      importWrapper.id = '';
+      importWrapper.hidden = false;
+      this.querySelector('.tile-page-content').appendChild(importWrapper);
+    },
+
+    /**
+     * Hide the 'Import bookmarks' promo

[Evan Stade, 2011/09/07 19:16:18]

.

[csilv, 2011/09/07 19:29:59]

Done.

+     * @private
+     */
+    hideImportPromo_: function() {
+      var wrapper = this.querySelector('.bookmarks-import-data-link-wrapper');
+      if (wrapper)
+        wrapper.parentNode.removeChild(wrapper);
+    },
+
+    /**
      * Create a bookmark from a title/url.
      * @param {!string} parentId Stringified int64 of the parent node's ID.
      * @param {number} index Sibling relative index, i.e. 3rd on this level.
      * @param {string} title More human readable title of the bookmark.
      * @param {string} url URL of the bookmark to be created.
      */
     generateBookmarkForLink: function(parentId, index, title, url) {
       // Bookmark creation actually only *requires* a parent ID, as if we just
       // pass a parent ID it's created as a folder with blank title as a child
       // of that parent.
@@ skipping 40 matching lines @@
       tile.stripeColor = color;
   }
 
   return {
     BookmarksPage: BookmarksPage,
     initBookmarkChevron: initBookmarkChevron,
   };
 });
 
 window.addEventListener('load', ntp4.initBookmarkChevron);