[NOT FOR LANDING] Detailed loading traces

chrome/browser/net/connect_interceptor.cc

 // Copyright (c) 2013 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/net/connect_interceptor.h"
 
+#include "base/trace_event/trace_event.h"
 #include "chrome/browser/net/predictor.h"
 #include "content/public/browser/resource_request_info.h"
 #include "content/public/common/resource_type.h"
 #include "net/base/load_flags.h"
 #include "net/url_request/url_request.h"
 
 namespace chrome_browser_net {
 
 ConnectInterceptor::ConnectInterceptor(Predictor* predictor)
     : timed_cache_(base::TimeDelta::FromSeconds(
           Predictor::kMaxUnusedSocketLifetimeSecondsWithoutAGet)),
       predictor_(predictor) {
   DCHECK(predictor);
 }
 
 ConnectInterceptor::~ConnectInterceptor() {
 }
 
 void ConnectInterceptor::WitnessURLRequest(net::URLRequest* request) {
+  TRACE_EVENT0("toplevel", "ConnectInterceptor::WitnessURLRequest");
+
   GURL request_scheme_host(Predictor::CanonicalizeUrl(request->url()));
   if (request_scheme_host == GURL::EmptyGURL())
     return;
 
   const content::ResourceRequestInfo* info =
       content::ResourceRequestInfo::ForRequest(request);
   bool is_main_frame = false;
   bool is_sub_frame = false;
   // TODO(mmenke):  Should the predictor really be fed requests without a
   // ResourceRequestInfo?
@@ skipping 53 matching lines @@
   // main frame request - way back in RenderViewHost::Navigate.  So only handle
   // predictions now for subresources or for redirected hosts.
   if (is_sub_frame || redirected_host) {
     predictor_->PredictFrameSubresources(request_scheme_host,
                                          request->first_party_for_cookies());
   }
   return;
 }
 
 }  // namespace chrome_browser_net