Make constructors in Worklets be properly exposed on the global.

third_party/WebKit/LayoutTests/http/tests/worklet/webexposed/resources/global-interface-listing-worklet.js

 /* Adopted from LayoutTests/webexposed/resources/global-interface-listing.js */
 
 // Run all the code in a local scope.
 (function(global_object) {
 
 var globals = [];
 
 // List of builtin JS constructors; Blink is not controlling what properties these
 // objects have, so exercising them in a Blink test doesn't make sense.
 //
@@ skipping 115 matching lines @@
 globals.push('global object');
 var property_strings = [];
 var member_names = Object.getOwnPropertyNames(global_object).filter(function(property_name) {
   return !js_builtins.has(property_name) && !is_web_idl_constructor(property_name);
 });
 member_names.forEach(function(property_name) {
   collect_property_info(global_object, property_name, property_strings);
 });
 globals.push.apply(globals, property_strings.sort());
 
-self.addEventListener('message', function(event) {
-  event.ports[0].postMessage({ result: globals });
+// Worklets don't have a mechanism to communicate back to the main page, dump
+// results into the console.
+globals.forEach(function(global) {
+    console.log(global);
 });
 
 })(this); // Run all the code in a local scope.