diff -r 000000000000 -r 6474c204b198 browser/metro/base/content/Site.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/metro/base/content/Site.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,74 @@
+// -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+'use strict';
+
+/**
+ * dumb model class to provide default values for sites.
+ * link parameter/model object expected to have a .url property, and optionally .title
+ */
+function Site(aLink) {
+  if (!aLink.url) {
+    throw Cr.NS_ERROR_INVALID_ARG;
+  }
+  this._link = aLink;
+}
+
+Site.prototype = {
+  icon: '',
+  get url() {
+    return this._link.url;
+  },
+  get title() {
+    // use url if no title was recorded
+    return this._link.title || this._link.url;
+  },
+  get label() {
+    // alias for .title
+    return this.title;
+  },
+  get pinned() {
+    return NewTabUtils.pinnedLinks.isPinned(this);
+  },
+  get contextActions() {
+    return [
+      'delete', // delete means hide here
+      this.pinned ? 'unpin' : 'pin'
+    ];
+  },
+  get blocked() {
+    return NewTabUtils.blockedLinks.isBlocked(this);
+  },
+  get attributeValues() {
+    return {
+      value: this.url,
+      label: this.title,
+      pinned: this.pinned ? true : undefined,
+      selected: this.selected,
+      customColor: this.color,
+      customImage: this.backgroundImage,
+      iconURI: this.icon,
+      "data-contextactions": this.contextActions.join(',')
+    };
+  },
+  applyToTileNode: function(aNode) {
+    // apply this site's properties as attributes on a tile element
+    // the decorated node acts as a view-model for the tile binding
+    let attrs = this.attributeValues;
+    for (let key in attrs) {
+      if (undefined === attrs[key]) {
+        aNode.removeAttribute(key);
+      } else {
+        aNode.setAttribute(key, attrs[key]);
+      }
+    }
+    // is binding already applied?
+    if ('refresh' in aNode) {
+      // just update it
+      aNode.refresh();
+    } else {
+      // these attribute values will get picked up later when the binding is applied
+    }
+  }
+};