Site Settings Desktop: Implement Zoom Levels category.

chrome/browser/resources/settings/site_settings/zoom_levels.js

+// Copyright 2016 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.
+
+/**
+ * @fileoverview
+ * 'zoom-levels' is the polymer element for showing the sites that are zoomed in
+ * or out.
+ */
+
+Polymer({
+  is: 'zoom-levels',
+
+  behaviors: [SiteSettingsBehavior, WebUIListenerBehavior],
+
+  properties: {
+    /**
+     * Array of sites that are zoomed in or out.
+     * @type {!Array<ZoomLevelEntry>}
+     */
+    sites_: Array,
+  },
+
+  ready: function() {
+    this.addWebUIListener('onZoomLevelsChanged',
+        this.onZoomLevelsChanged_.bind(this));
+    this.browserProxy.fetchZoomLevels();
+  },
+
+  /**
+   * A handler for when zoom levels change.
+   * @param {!Array<ZoomLevelEntry>} sites The up to date list of sites and
+   *     their zoom levels.
+   */
+  onZoomLevelsChanged_: function(sites) {
+    this.sites_ = sites;
+  },
+
+  /**
+   * A handler for when a zoom level for a site is deleted.
+   * @param {!{model: !{index: number}}} event
+   * @private
+   */
+   removeZoomLevel_: function(event) {
+     var site = this.sites_[event.model.index];
+     this.browserProxy.removeZoomLevel(site.origin);
+  },
+});