Adding instrumentation to locate the source of jankiness.

net/socket/socks_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/socket/socks_client_socket_pool.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/time/time.h"
 #include "base/values.h"
@@ skipping 58 matching lines @@
     case STATE_SOCKS_CONNECT:
     case STATE_SOCKS_CONNECT_COMPLETE:
       return LOAD_STATE_CONNECTING;
     default:
       NOTREACHED();
       return LOAD_STATE_IDLE;
   }
 }
 
 void SOCKSConnectJob::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 SOCKSConnectJob::OnIOComplete"));
   int rv = DoLoop(result);
   if (rv != ERR_IO_PENDING)
     NotifyDelegateOfCompletion(rv);  // Deletes |this|
 }
 
 int SOCKSConnectJob::DoLoop(int result) {
   DCHECK_NE(next_state_, STATE_NONE);
 
   int rv = result;
   do {
@@ skipping 214 matching lines @@
   base_.RemoveHigherLayeredPool(higher_pool);
 }
 
 bool SOCKSClientSocketPool::CloseOneIdleConnection() {
   if (base_.CloseOneIdleSocket())
     return true;
   return base_.CloseOneIdleConnectionInHigherLayeredPool();
 }
 
 }  // namespace net