Adding instrumentation to locate the source of jankiness.

chrome/service/cloud_print/print_system_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 "chrome/service/cloud_print/print_system.h"
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 74 matching lines @@
     printer_.Close();
     printer_change_.Close();
     return true;
   }
 
   // base::ObjectWatcher::Delegate method
   virtual void OnObjectSignaled(HANDLE object) {
     // TODO(vadimt): Remove ScopedTracker below once crbug.com/418183 is fixed.
     tracked_objects::ScopedTracker tracking_profile(
         FROM_HERE_WITH_EXPLICIT_FUNCTION(
-            "PrintSystemWatcherWin_OnObjectSignaled"));
+            "418183 PrintSystemWatcherWin::OnObjectSignaled"));
 
     crash_keys::ScopedPrinterInfo crash_key(printer_info_);
     DWORD change = 0;
     FindNextPrinterChangeNotification(object, &change, NULL, NULL);
 
     if (change != ((PRINTER_CHANGE_PRINTER|PRINTER_CHANGE_JOB) &
                   (~PRINTER_CHANGE_FAILED_CONNECTION_PRINTER))) {
       // For printer connections, we get spurious change notifications with
       // all flags set except PRINTER_CHANGE_FAILED_CONNECTION_PRINTER.
       // Ignore these.
@@ skipping 724 matching lines @@
 }
 
 }  // namespace
 
 scoped_refptr<PrintSystem> PrintSystem::CreateInstance(
     const base::DictionaryValue* print_system_settings) {
   return new PrintSystemWin;
 }
 
 }  // namespace cloud_print