[NOT FOR LANDING] Detailed loading traces

content/browser/loader/layered_resource_handler.cc

Index: content/browser/loader/layered_resource_handler.cc
diff --git a/content/browser/loader/layered_resource_handler.cc b/content/browser/loader/layered_resource_handler.cc
index 9ff3d55e6f3f72d389b7b71bd4a2f1d0b414e879..8b80a095d6ccb0b10361a4a07632b0ddfad5fdf6 100644
--- a/content/browser/loader/layered_resource_handler.cc
+++ b/content/browser/loader/layered_resource_handler.cc
@@ -5,7 +5,7 @@
 #include "content/browser/loader/layered_resource_handler.h"
 
 #include <utility>
-
+#include "base/trace_event/trace_event.h"
 #include "base/logging.h"
 
 namespace content {
@@ -16,6 +16,7 @@ LayeredResourceHandler::LayeredResourceHandler(
     : ResourceHandler(request), next_handler_(std::move(next_handler)) {}
 
 LayeredResourceHandler::~LayeredResourceHandler() {
+  TRACE_EVENT0("toplevel", "LayeredResourceHandler::~LayeredResourceHandler");
 }
 
 void LayeredResourceHandler::SetController(ResourceController* controller) {