Add ongoing events to net-export log when logging starts

ios/chrome/browser/ui/webui/net_export/net_export_ui.cc

 // Copyright 2015 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 "ios/chrome/browser/ui/webui/net_export/net_export_ui.h"
 
 #include <memory>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 121 matching lines @@
 }
 
 void NetExportMessageHandler::OnStartNetLog(const base::ListValue* list) {
   DCHECK_CURRENTLY_ON(web::WebThread::UI);
   std::string capture_mode_string;
   bool result = list->GetString(0, &capture_mode_string);
   DCHECK(result);
 
   net::NetLogCaptureMode capture_mode =
       net_log::NetLogFileWriter::CaptureModeFromString(capture_mode_string);
-  file_writer_->StartNetLog(base::FilePath(), capture_mode);
+  file_writer_->StartNetLog(
+      base::FilePath(), capture_mode,
+      {GetApplicationContext()->GetSystemURLRequestContext()});
 }
 
 void NetExportMessageHandler::OnStopNetLog(const base::ListValue* list) {
   DCHECK_CURRENTLY_ON(web::WebThread::UI);
   file_writer_->StopNetLog(
       nullptr, GetApplicationContext()->GetSystemURLRequestContext());
 }
 
 void NetExportMessageHandler::OnSendNetLog(const base::ListValue* list) {
   DCHECK_CURRENTLY_ON(web::WebThread::UI);
@@ skipping 32 matching lines @@
 }
 
 }  // namespace
 
 NetExportUI::NetExportUI(web::WebUIIOS* web_ui)
     : web::WebUIIOSController(web_ui) {
   web_ui->AddMessageHandler(base::MakeUnique<NetExportMessageHandler>());
   web::WebUIIOSDataSource::Add(ios::ChromeBrowserState::FromWebUIIOS(web_ui),
                                CreateNetExportHTMLSource());
 }