[NOT FOR LANDING] Detailed loading traces

content/browser/devtools/devtools_netlog_observer.cc

Index: content/browser/devtools/devtools_netlog_observer.cc
diff --git a/content/browser/devtools/devtools_netlog_observer.cc b/content/browser/devtools/devtools_netlog_observer.cc
index 6a2a3c45be088470b1e3b0cc229cefec129dde02..2e1d3d96d8b3a33daa4e623943fb87f0bb6ee15d 100644
--- a/content/browser/devtools/devtools_netlog_observer.cc
+++ b/content/browser/devtools/devtools_netlog_observer.cc
@@ -5,7 +5,7 @@
 #include "content/browser/devtools/devtools_netlog_observer.h"
 
 #include <stddef.h>
-
+#include "base/trace_event/trace_event.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "content/browser/loader/resource_request_info_impl.h"
@@ -190,6 +190,7 @@ DevToolsNetLogObserver* DevToolsNetLogObserver::GetInstance() {
 void DevToolsNetLogObserver::PopulateResponseInfo(
     net::URLRequest* request,
     ResourceResponse* response) {
+  TRACE_EVENT0("toplevel", "DevToolsNetLogObserver::PopulateResponseInfo");
   const ResourceRequestInfoImpl* request_info =
       ResourceRequestInfoImpl::ForRequest(request);
   if (!request_info || !request_info->ShouldReportRawHeaders())