Adding instrumentation to locate the source of jankiness.

net/dns/dns_config_service_win.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/dns/dns_config_service_win.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 294 matching lines @@
     if (key_.Open(HKEY_LOCAL_MACHINE, key, KEY_NOTIFY) != ERROR_SUCCESS)
       return false;
 
     return key_.StartWatching(base::Bind(&RegistryWatcher::OnObjectSignaled,
                                          base::Unretained(this)));
   }
 
   void OnObjectSignaled() {
     // TODO(vadimt): Remove ScopedTracker below once crbug.com/418183 is fixed.
     tracked_objects::ScopedTracker tracking_profile(
-        FROM_HERE_WITH_EXPLICIT_FUNCTION("RegistryWatcher_OnObjectSignaled"));
+        FROM_HERE_WITH_EXPLICIT_FUNCTION(
+            "418183 RegistryWatcher::OnObjectSignaled"));
 
     DCHECK(CalledOnValidThread());
     DCHECK(!callback_.is_null());
     if (key_.StartWatching(base::Bind(&RegistryWatcher::OnObjectSignaled,
                                       base::Unretained(this)))) {
       callback_.Run(true);
     } else {
       key_.Close();
       callback_.Run(false);
     }
@@ skipping 432 matching lines @@
 }
 
 }  // namespace internal
 
 // static
 scoped_ptr<DnsConfigService> DnsConfigService::CreateSystemService() {
   return scoped_ptr<DnsConfigService>(new internal::DnsConfigServiceWin());
 }
 
 }  // namespace net