Adding instrumentation to locate the source of jankiness.

net/http/http_proxy_client_socket_pool.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_proxy_client_socket_pool.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
@@ skipping 110 matching lines @@
 }
 
 void HttpProxyConnectJob::GetAdditionalErrorState(ClientSocketHandle * handle) {
   if (error_response_info_.cert_request_info.get()) {
     handle->set_ssl_error_response_info(error_response_info_);
     handle->set_is_ssl_error(true);
   }
 }
 
 void HttpProxyConnectJob::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 HttpProxyConnectJob::OnIOComplete"));
   int rv = DoLoop(result);
   if (rv != ERR_IO_PENDING) {
     NotifyProxyDelegateOfCompletion(rv);
     NotifyDelegateOfCompletion(rv);  // Deletes |this|
   }
 }
 
 int HttpProxyConnectJob::DoLoop(int result) {
   DCHECK_NE(next_state_, STATE_NONE);
 
@@ skipping 421 matching lines @@
   base_.RemoveHigherLayeredPool(higher_pool);
 }
 
 bool HttpProxyClientSocketPool::CloseOneIdleConnection() {
   if (base_.CloseOneIdleSocket())
     return true;
   return base_.CloseOneIdleConnectionInHigherLayeredPool();
 }
 
 }  // namespace net