Adding instrumentation to locate the source of jankiness.

net/url_request/url_request_job.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 "net/url_request/url_request_job.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
 #include "base/power_monitor/power_monitor.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "net/base/auth.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_states.h"
 #include "net/base/net_errors.h"
 #include "net/base/network_delegate.h"
 #include "net/filter/filter.h"
 #include "net/http/http_response_headers.h"
@@ skipping 271 matching lines @@
 }
 
 void URLRequestJob::NotifyBeforeNetworkStart(bool* defer) {
   if (!request_)
     return;
 
   request_->NotifyBeforeNetworkStart(defer);
 }
 
 void URLRequestJob::NotifyHeadersComplete() {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/423948 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "423948 URLRequestJob::NotifyHeadersComplete"));
+
   if (!request_ || !request_->has_delegate())
     return;  // The request was destroyed, so there is no more work to do.
 
   if (has_handled_response_)
     return;
 
   DCHECK(!request_->status().is_io_pending());
 
   // Initialize to the current time, and let the subclass optionally override
   // the time stamps if it has that information.  The default request_time is
@@ skipping 483 matching lines @@
       !redirect_info.new_url.SchemeIsSecure()) {
     redirect_info.new_referrer.clear();
   } else {
     redirect_info.new_referrer = request_->referrer();
   }
 
   return redirect_info;
 }
 
 }  // namespace net