PlzNavigate: properly set the initiator of the navigation

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 410 matching lines @@
   mojom::URLLoaderFactoryPtr factory;
   URLLoaderFactoryImpl::Create(
       ResourceRequesterInfo::CreateForNavigationPreload(requester_info),
       mojo::MakeRequest(&url_loader_factory_));
 
   preload_handle_ = mojom::FetchEventPreloadHandle::New();
 
   ResourceRequest request;
   request.method = original_request->method();
   request.url = original_request->url();
-  request.request_initiator = original_request->initiator();
+  // TODO(horo): Set first_party_for_cookies to support Same-site Cookies.
+  request.request_initiator = original_request->initiator().has_value()
+                                  ? original_request->initiator()
+                                  : url::Origin(original_request->url());
   request.referrer = GURL(original_request->referrer());
   request.referrer_policy = original_info->GetReferrerPolicy();
   request.visibility_state = original_info->GetVisibilityState();
   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;
@@ skipping 34 matching lines @@
 }
 
 ServiceWorkerMetrics::EventType ServiceWorkerFetchDispatcher::GetEventType()
     const {
   if (request_->fetch_type == ServiceWorkerFetchType::FOREIGN_FETCH)
     return ServiceWorkerMetrics::EventType::FOREIGN_FETCH;
   return ResourceTypeToEventType(resource_type_);
 }
 
 }  // namespace content