[ntp4] Observe and process bookmark change notifications from the bookmarks data model.

chrome/browser/resources/ntp4/tile_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';
 
   // We can't pass the currently dragging tile via dataTransfer because of
   // http://crbug.com/31037
   var currentlyDraggingTile = null;
@@ skipping 395 matching lines @@
                             this.onNodeInsertedIntoDocument_);
       this.content_.addEventListener('scroll', this.onScroll_.bind(this));
 
       this.dragWrapper_ = new DragWrapper(this.tileGrid_, this);
 
       $('page-list').addEventListener(
           CardSlider.EventType.CARD_CHANGED,
           this.onCardChanged.bind(this));
     },
 
+    get tiles() {
+      return this.tileElements_;
+    },
+
     get tileCount() {
       return this.tileElements_.length;
     },
 
     get selected() {
       return Array.prototype.indexOf.call(this.parentNode.children, this) ==
           ntp4.getCardSlider().currentCard;
     },
 
     /**
@@ skipping 53 matching lines @@
       }
       this.calculateLayoutValues_();
 
       this.positionTile_(index);
     },
 
     /**
      * Removes the given tile and animates the respositioning of the other
      * tiles.
      * @param {HTMLElement} tile The tile to remove from |tileGrid_|.
+     * @param {?boolean} animate If true, tiles will animate.
      */
-    removeTile: function(tile) {
-      this.classList.add('animating-tile-page');
+    removeTile: function(tile, animate) {
+      if (animate)
+        this.classList.add('animating-tile-page');
       var index = Array.prototype.indexOf.call(this.tileElements_, tile);
       tile.parentNode.removeChild(tile);
       this.calculateLayoutValues_();
       for (var i = index; i < this.tileElements_.length; i++) {
         this.positionTile_(i);
       }
     },
 
     /**
      * Removes all tiles from the page.
@@ skipping 504 matching lines @@
      */
     tileMoved: function(draggedTile) {
     },
   };
 
   return {
     getCurrentlyDraggingTile: getCurrentlyDraggingTile,
     TilePage: TilePage,
   };
 });