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

content/browser/service_worker/service_worker_url_request_job.cc

 // Copyright 2014 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.
 
 #include "content/browser/service_worker/service_worker_url_request_job.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <limits>
@@ skipping 656 matching lines @@
   if (resource_type_ != RESOURCE_TYPE_MAIN_FRAME)
     return;
   if (!worker_already_activated_)
     return;
   if (version->skip_recording_startup_time() &&
       initial_worker_status_ != EmbeddedWorkerStatus::RUNNING) {
     return;
   }
   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(
     ServiceWorkerStatusCode status,
     ServiceWorkerFetchEventResult fetch_result,
     const ServiceWorkerResponse& response,
     const scoped_refptr<ServiceWorkerVersion>& version) {
   fetch_dispatcher_.reset();
   ServiceWorkerMetrics::RecordFetchEventStatus(IsMainResourceLoad(), status);
 
@@ skipping 349 matching lines @@
       CreateFetchRequest(), active_worker, resource_type_, request()->net_log(),
       base::Bind(&ServiceWorkerURLRequestJob::DidPrepareFetchEvent,
                  weak_factory_.GetWeakPtr(), active_worker),
       base::Bind(&ServiceWorkerURLRequestJob::DidDispatchFetchEvent,
                  weak_factory_.GetWeakPtr())));
   worker_start_time_ = base::TimeTicks::Now();
   fetch_dispatcher_->Run();
 }
 
 }  // namespace content