Typecheck some of ui/webui/resources/js/ with Closure compiler.

ui/webui/resources/js/parse_html_subset.js

 // Copyright (c) 2012 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.
 
 /**
  * Parse a very small subset of HTML.  This ensures that insecure HTML /
  * javascript cannot be injected into the new tab page.
  * @param {string} s The string to parse.
  * @param {Array.<string>=} opt_extraTags Optional extra allowed tags.
  * @param {Object.<string, function(Node, string):boolean>=} opt_extraAttrs
@@ skipping 19 matching lines @@
     }
   };
 
   /**
    * Whitelist of tag names allowed in parseHtmlSubset.
    * @type {!Array.<string>}
    * @const
    */
   var allowedTags = ['A', 'B', 'STRONG'];
 
-  function merge() {
+  /** @param {...Object} var_args Objects to merge. */
+  function merge(var_args) {
     var clone = {};
     for (var i = 0; i < arguments.length; ++i) {
       if (typeof arguments[i] == 'object') {
         for (var key in arguments[i]) {
           if (arguments[i].hasOwnProperty(key))
             clone[key] = arguments[i][key];
         }
       }
     }
     return clone;
@@ skipping 44 matching lines @@
         case Node.TEXT_NODE:
           break;
 
         default:
           throw Error('Node type ' + node.nodeType + ' is not supported');
       }
     });
     return df;
   };
 })();