Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/oninstall-throw-error-from-nested-event-worker.js

 var max_nesting_level = 8;
 
 self.addEventListener('message', function(event) {
     var level = event.data;
     if (level < max_nesting_level)
       dispatchEvent(new MessageEvent('message', { data: level + 1 }));
     throw Error('error at level ' + level);
   });
 
 self.addEventListener('install', function(event) {
     dispatchEvent(new MessageEvent('message', { data: 1 }));
   });