[NOT FOR LANDING] Detailed loading traces

chrome/browser/download/download_resource_throttle.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #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"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/resource_controller.h"
 
 #if defined(OS_ANDROID)
 #include "content/public/browser/android/download_controller_android.h"
 #include "content/public/browser/render_view_host.h"
 
@@ skipping 78 matching lines @@
           &CanDownloadOnUIThread,
           base::Passed(scoped_ptr<DownloadRequestInfo>(new DownloadRequestInfo(
               limiter, web_contents_getter, url, request_method,
               base::Bind(&OnCanDownloadDecided, AsWeakPtr()))))));
 }
 
 DownloadResourceThrottle::~DownloadResourceThrottle() {
 }
 
 void DownloadResourceThrottle::WillStartRequest(bool* defer) {
+  TRACE_EVENT0("toplevel", "DownloadResourceThrottle::WillStartRequest");
   WillDownload(defer);
 }
 
 void DownloadResourceThrottle::WillRedirectRequest(
     const net::RedirectInfo& redirect_info,
     bool* defer) {
   WillDownload(defer);
 }
 
 void DownloadResourceThrottle::WillProcessResponse(bool* defer) {
@@ skipping 33 matching lines @@
 
   if (request_deferred_) {
     request_deferred_ = false;
     if (allow) {
       controller()->Resume();
     } else {
       controller()->Cancel();
     }
   }
 }