Site Settings: Implement dialog for adding site exceptions.

chrome/browser/resources/settings/site_settings/site_settings_prefs_browser_proxy.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 A helper object used from the "Site Settings" section to
  * interact with the content settings prefs.
  */
 
 /**
@@ skipping 64 matching lines @@
      * Sets the category permission for a given origin (expressed as primary
      *    and secondary patterns).
      * @param {string} primaryPattern The origin to change (primary pattern).
      * @param {string} secondaryPattern The embedding origin to change
      *    (secondary pattern).
      * @param {number} contentType The category to change.
      * @param {string} value The value to change the permission to.
      */
     setCategoryPermissionForOrigin: function(
         primaryPattern, secondaryPattern, contentType, value) {},
+
+    /**
+     * Checks whether a pattern is valid.
+     * @param {string} pattern The pattern to check
+     * @return {!Promise<boolean>} True if the pattern is valid.
+     */
+    isPatternValid: function(pattern) {},
   };
 
   /**
    * @constructor
    * @implements {SiteSettingsPrefsBrowserProxy}
    */
   function SiteSettingsPrefsBrowserProxyImpl() {}
 
   // The singleton instance_ is replaced with a test version of this wrapper
   // during testing.
@@ skipping 21 matching lines @@
       chrome.send('resetCategoryPermissionForOrigin',
           [primaryPattern, secondaryPattern, contentType]);
     },
 
     /** @override */
     setCategoryPermissionForOrigin: function(
         primaryPattern, secondaryPattern, contentType, value) {
       chrome.send('setCategoryPermissionForOrigin',
           [primaryPattern, secondaryPattern, contentType, value]);
     },
+
+    /** @override */
+    isPatternValid: function(pattern) {
+      return cr.sendWithPromise('isPatternValid', pattern);
+    },
+
   };
 
   return {
     SiteSettingsPrefsBrowserProxyImpl: SiteSettingsPrefsBrowserProxyImpl,
   };
 });