MD Settings: For some content types, make per-site exceptions read-only.

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

 // Copyright 2015 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.
 
 /**
  * Enumeration mapping all possible controlled-by values for exceptions to
  * icons.
  * @enum {string}
  */
 var iconControlledBy = {
@@ skipping 17 matching lines @@
   properties: {
     /** @private */
     enableSiteSettings_: {
       type: Boolean,
       value: function() {
         return loadTimeData.getBoolean('enableSiteSettings');
       },
     },
 
     /**
+     * Some content types (like Location) do not allow the user to manually
+     * edit the exception list from within Settings.
+     * @private
+     */
+    readOnlyList: {
+      type: Boolean,
+      value: false,
+    },
+
+    /**
      * The site serving as the model for the currently open action menu.
      * @private {?SiteException}
      */
     actionMenuSite_: Object,
 
     /**
      * Whether the "edit exception" dialog should be shown.
      * @private
      */
     showEditExceptionDialog_: Boolean,
@@ skipping 151 matching lines @@
    * Whether there are any site exceptions added for this content setting.
    * @return {boolean}
    * @private
    */
   hasSites_: function() {
     return !!this.sites.length;
   },
 
   /**
    * @param {string} source Where the setting came from.
+   * @param {boolean} readOnlyList Whether the site exception list is read-only.
    * @return {boolean}
    * @private
    */
-  isActionMenuHidden_: function(source) {
-    return this.isExceptionControlled_(source) || this.allSites;
+  isActionMenuHidden_: function(source, readOnlyList) {
+    return this.isExceptionControlled_(source) || this.allSites || readOnlyList;
   },
 
   /**
    * A handler for the Add Site button.
    * @param {!Event} e
    * @private
    */
   onAddSiteTap_: function(e) {
+    assert(!this.readOnlyList);
     e.preventDefault();
     var dialog = document.createElement('add-site-dialog');
     dialog.category = this.category;
     dialog.contentSetting = this.categorySubtype;
     this.shadowRoot.appendChild(dialog);
 
     dialog.open(this.categorySubtype);
 
     dialog.addEventListener('close', function() {
       dialog.remove();
@@ skipping 268 matching lines @@
 
   /** @private */
   closeActionMenu_: function() {
     this.actionMenuSite_ = null;
     var actionMenu = /** @type {!CrActionMenuElement} */ (
         this.$$('dialog[is=cr-action-menu]'));
     if (actionMenu.open)
       actionMenu.close();
   },
 });