[NOT FOR LANDING] Detailed loading traces

content/browser/loader/sync_resource_handler.cc

Index: content/browser/loader/sync_resource_handler.cc
diff --git a/content/browser/loader/sync_resource_handler.cc b/content/browser/loader/sync_resource_handler.cc
index ebb2a437533dbb57152dd01ee0fc1c7a7ffbf59b..abed712de61013ba9a6efea0c9723b5d5b2cbc0e 100644
--- a/content/browser/loader/sync_resource_handler.cc
+++ b/content/browser/loader/sync_resource_handler.cc
@@ -4,6 +4,7 @@
 
 #include "content/browser/loader/sync_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/resource_dispatcher_host_impl.h"
@@ -31,6 +32,8 @@ SyncResourceHandler::SyncResourceHandler(
 }
 
 SyncResourceHandler::~SyncResourceHandler() {
+  TRACE_EVENT0("toplevel", "SyncResourceHandler::~SyncResourceHandler");
+
   if (result_message_) {
     result_message_->set_reply_error();
     ResourceMessageFilter* filter = GetFilter();