[NOT FOR LANDING] Detailed loading traces

content/browser/loader/navigation_resource_handler.cc

Index: content/browser/loader/navigation_resource_handler.cc
diff --git a/content/browser/loader/navigation_resource_handler.cc b/content/browser/loader/navigation_resource_handler.cc
index 94e046dbf0c74bf8044e6cd93484c3cab38563fa..a9dc3c8dd2edb96041e820914efb2de42e30319e 100644
--- a/content/browser/loader/navigation_resource_handler.cc
+++ b/content/browser/loader/navigation_resource_handler.cc
@@ -4,6 +4,7 @@
 
 #include "content/browser/loader/navigation_resource_handler.h"
 
+#include "base/trace_event/trace_event.h"
 #include "base/logging.h"
 #include "content/browser/devtools/devtools_netlog_observer.h"
 #include "content/browser/loader/navigation_url_loader_impl_core.h"
@@ -29,6 +30,9 @@ NavigationResourceHandler::NavigationResourceHandler(
 }
 
 NavigationResourceHandler::~NavigationResourceHandler() {
+  TRACE_EVENT0("toplevel",
+               "NavigationResourceHandler::~NavigationResourceHandler");
+
   if (core_) {
     core_->NotifyRequestFailed(false, net::ERR_ABORTED);
     DetachFromCore();