[NOT FOR LANDING] Detailed loading traces

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index 0f8a31b584d86bd7990de5e7977ffe6e44236d9b..cf3e26813402de73cd6abbc083f6d29b62a0fe2b 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -630,6 +630,8 @@ void ChromeResourceDispatcherHostDelegate::OnResponseStarted(
     content::ResourceContext* resource_context,
     content::ResourceResponse* response,
     IPC::Sender* sender) {
+  TRACE_EVENT0("toplevel",
+               "ChromeResourceDispatcherHostDelegate::OnResponseStarted");
   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
   ProfileIOData* io_data = ProfileIOData::FromResourceContext(resource_context);