[NOT FOR LANDING] Detailed loading traces

chrome/browser/download/download_resource_throttle.cc

Index: chrome/browser/download/download_resource_throttle.cc
diff --git a/chrome/browser/download/download_resource_throttle.cc b/chrome/browser/download/download_resource_throttle.cc
index 041a44d784ccdf87d44bbe8eea770d2c37a8def9..fdfd873f3229b0b953364e50da6dcffc064a3503 100644
--- a/chrome/browser/download/download_resource_throttle.cc
+++ b/chrome/browser/download/download_resource_throttle.cc
@@ -5,7 +5,7 @@
 #include "chrome/browser/download/download_resource_throttle.h"
 
 #include <utility>
-
+#include "base/trace_event/trace_event.h"
 #include "base/bind.h"
 #include "build/build_config.h"
 #include "chrome/browser/download/download_stats.h"
@@ -104,6 +104,7 @@ DownloadResourceThrottle::~DownloadResourceThrottle() {
 }
 
 void DownloadResourceThrottle::WillStartRequest(bool* defer) {
+  TRACE_EVENT0("toplevel", "DownloadResourceThrottle::WillStartRequest");
   WillDownload(defer);
 }