[NOT FOR LANDING] Detailed loading traces

content/browser/loader/detachable_resource_handler.cc

Index: content/browser/loader/detachable_resource_handler.cc
diff --git a/content/browser/loader/detachable_resource_handler.cc b/content/browser/loader/detachable_resource_handler.cc
index 786252f5b6bab57cbde33588aac9605ac35a1338..dae5c70891ee97813bc638528cb666281c3620b9 100644
--- a/content/browser/loader/detachable_resource_handler.cc
+++ b/content/browser/loader/detachable_resource_handler.cc
@@ -5,7 +5,7 @@
 #include "content/browser/loader/detachable_resource_handler.h"
 
 #include <utility>
-
+#include "base/trace_event/trace_event.h"
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "content/browser/loader/resource_request_info_impl.h"
@@ -34,6 +34,8 @@ DetachableResourceHandler::DetachableResourceHandler(
 }
 
 DetachableResourceHandler::~DetachableResourceHandler() {
+  TRACE_EVENT0("toplevel",
+               "DetachableResourceHandler::~DetachableResourceHandler");
   // Cleanup back-pointer stored on the request info.
   GetRequestInfo()->set_detachable_handler(NULL);
 }
@@ -118,6 +120,7 @@ bool DetachableResourceHandler::OnResponseStarted(ResourceResponse* response,
 }
 
 bool DetachableResourceHandler::OnWillStart(const GURL& url, bool* defer) {
+  TRACE_EVENT0("toplevel", "DetachableResourceHandler::OnWillStart");
   DCHECK(!is_deferred_);
 
   if (!next_handler_)