Show service worker navigation preload requests in DevTools Network tab

content/browser/loader/resource_dispatcher_host_impl.cc

 // Copyright (c) 2012 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <stddef.h>
 
@@ skipping 1483 matching lines @@
   bool allow_download = request_data.allow_download &&
       IsResourceTypeFrame(request_data.resource_type);
   bool do_not_prompt_for_login = request_data.do_not_prompt_for_login;
   bool is_sync_load = !!sync_result_handler;
 
   // Raw headers are sensitive, as they include Cookie/Set-Cookie, so only
   // allow requesting them if requester has ReadRawCookies permission.
   ChildProcessSecurityPolicyImpl* policy =
       ChildProcessSecurityPolicyImpl::GetInstance();
   bool report_raw_headers = request_data.report_raw_headers;
-  if (report_raw_headers && !policy->CanReadRawCookies(child_id)) {
+  if (report_raw_headers && !policy->CanReadRawCookies(child_id) &&
+      !requester_info->IsNavigationPreload()) {

[falken, 2017/01/17 14:38:36]

Can you add a comment about why navigation preload is exempted from the
ReadRawCookies permission?

[horo, 2017/01/18 14:25:02]

Done.

     // TODO: crbug.com/523063 can we call bad_message::ReceivedBadMessage here?
     VLOG(1) << "Denied unauthorized request for raw headers";
     report_raw_headers = false;
   }
   int load_flags = BuildLoadFlagsForRequest(request_data, is_sync_load);
   if (request_data.resource_type == RESOURCE_TYPE_PREFETCH ||
       request_data.resource_type == RESOURCE_TYPE_FAVICON) {
     do_not_prompt_for_login = true;
   }
   if (request_data.resource_type == RESOURCE_TYPE_IMAGE &&
@@ skipping 1316 matching lines @@
                                  &throttles);
     if (!throttles.empty()) {
       handler.reset(new ThrottlingResourceHandler(std::move(handler), request,
                                                   std::move(throttles)));
     }
   }
   return handler;
 }
 
 }  // namespace content