Adding instrumentation to locate the source of jankiness.

net/http/http_stream_factory_impl_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/http/http_stream_factory_impl_job.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "net/base/connection_type_histograms.h"
 #include "net/base/net_log.h"
 #include "net/base/net_util.h"
 #include "net/http/http_basic_stream.h"
 #include "net/http/http_network_session.h"
@@ skipping 406 matching lines @@
     const BoundNetLog& net_log) {
   // It is OK to dereference spdy_session_pool, because the
   // ClientSocketPoolManager will be destroyed in the same callback that
   // destroys the SpdySessionPool.
   return
       spdy_session_pool->FindAvailableSession(spdy_session_key, net_log) ?
       ERR_SPDY_SESSION_ALREADY_EXISTS : OK;
 }
 
 void HttpStreamFactoryImpl::Job::OnIOComplete(int result) {
+  // TODO(pkasting): Remove ScopedTracker below once crbug.com/455884 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "455884 HttpStreamFactoryImpl::Job::OnIOComplete"));
   RunLoop(result);
 }
 
 int HttpStreamFactoryImpl::Job::RunLoop(int result) {
   result = DoLoop(result);
 
   if (result == ERR_IO_PENDING)
     return result;
 
   // If there was an error, we should have already resumed the |waiting_job_|,
@@ skipping 1027 matching lines @@
 
   if (job_status_ == STATUS_SUCCEEDED && other_job_status_ == STATUS_BROKEN) {
     HistogramBrokenAlternateProtocolLocation(
         BROKEN_ALTERNATE_PROTOCOL_LOCATION_HTTP_STREAM_FACTORY_IMPL_JOB_MAIN);
     session_->http_server_properties()->SetBrokenAlternateProtocol(
         HostPortPair::FromURL(request_info_.url));
   }
 }
 
 }  // namespace net