[proof-of-concept] SW thread independent of the main thread

content/browser/service_worker/service_worker_url_request_job.cc

Index: content/browser/service_worker/service_worker_url_request_job.cc
diff --git a/content/browser/service_worker/service_worker_url_request_job.cc b/content/browser/service_worker/service_worker_url_request_job.cc
index be241fb862f45d2064fbe5d9a66aeba837622e2b..1e6db812886e4a80cf72200203b35ddb48be4af9 100644
--- a/content/browser/service_worker/service_worker_url_request_job.cc
+++ b/content/browser/service_worker/service_worker_url_request_job.cc
@@ -674,9 +674,11 @@ void ServiceWorkerURLRequestJob::DidPrepareFetchEvent(
   }
   if (version->should_exclude_from_uma())
     return;
-  ServiceWorkerMetrics::RecordActivatedWorkerPreparationTimeForMainFrame(
-      worker_ready_time_ - request()->creation_time(), initial_worker_status_,
-      version->embedded_worker()->start_situation());
+  /*
+  TODO:
+ ServiceWorkerMetrics::RecordActivatedWorkerPreparationTimeForMainFrame(
+     worker_ready_time_ - request()->creation_time(), initial_worker_status_,
+     version->embedded_worker()->start_situation());*/
 }
 
 void ServiceWorkerURLRequestJob::DidDispatchFetchEvent(