Show service worker navigation preload requests in DevTools Network tab

content/browser/service_worker/service_worker_fetch_dispatcher.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_fetch_dispatcher.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 442 matching lines @@
   request.load_flags = original_request->load_flags();
   // Set to SUB_RESOURCE because we shouldn't trigger NavigationResourceThrottle
   // for the service worker navigation preload request.
   request.resource_type = RESOURCE_TYPE_SUB_RESOURCE;
   request.priority = original_request->priority();
   request.skip_service_worker = SkipServiceWorker::ALL;
   request.do_not_prompt_for_login = true;
   request.render_frame_id = original_info->GetRenderFrameID();
   request.is_main_frame = original_info->IsMainFrame();
   request.parent_is_main_frame = original_info->ParentIsMainFrame();
+  request.enable_load_timing = original_info->is_load_timing_enabled();
+  request.report_raw_headers = original_info->ShouldReportRawHeaders();
 
   DCHECK(net::HttpUtil::IsValidHeaderValue(
       version_->navigation_preload_state().header));
   ServiceWorkerMetrics::RecordNavigationPreloadRequestHeaderSize(
       version_->navigation_preload_state().header.length());
   request.headers = "Service-Worker-Navigation-Preload: " +
                     version_->navigation_preload_state().header + "\r\n" +
                     original_request->extra_request_headers().ToString();
 
   const int request_id = ResourceDispatcherHostImpl::Get()->MakeRequestID();
@@ skipping 38 matching lines @@
     ServiceWorkerVersion* version,
     int event_finish_id,
     scoped_refptr<URLLoaderAssets> url_loader_assets,
     ServiceWorkerStatusCode status,
     base::Time dispatch_event_time) {
   version->FinishRequest(event_finish_id, status != SERVICE_WORKER_ERROR_ABORT,
                          dispatch_event_time);
 }
 
 }  // namespace content