Add new histograms to measure time in PreMainMessageLoop.

chrome/browser/ui/startup/startup_browser_creator.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/browser/ui/startup/startup_browser_creator.h"
 
 #include <algorithm>   // For max().
 #include <set>
 
 #include "apps/app_load_service.h"
 #include "apps/switches.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
+#include "base/trace_event/trace_event.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/auto_launch_trial.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/extensions/startup_helper.h"
 #include "chrome/browser/extensions/unpacked_installer.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/notifications/desktop_notification_service.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
@@ skipping 436 matching lines @@
 }
 
 // static
 bool StartupBrowserCreator::ProcessCmdLineImpl(
     const base::CommandLine& command_line,
     const base::FilePath& cur_dir,
     bool process_startup,
     Profile* last_used_profile,
     const Profiles& last_opened_profiles,
     StartupBrowserCreator* browser_creator) {
+  TRACE_EVENT0("startup", "StartupBrowserCreator::ProcessCmdLineImpl");
+  SCOPED_UMA_HISTOGRAM_TIMER(
+      "Startup.StartupBrowserCreator_ProcessCmdLineImplTime");
+
   VLOG(2) << "ProcessCmdLineImpl : BEGIN";
   DCHECK(last_used_profile);
   if (process_startup) {
     if (command_line.HasSwitch(switches::kDisablePromptOnRepost))
       content::NavigationController::DisablePromptOnRepost();
   }
 
   bool silent_launch = false;
 
 #if defined(ENABLE_PRINT_PREVIEW)
@@ skipping 360 matching lines @@
   // If we are showing the app list then chrome isn't shown so load the app
   // list's profile rather than chrome's.
   if (command_line.HasSwitch(switches::kShowAppList)) {
     return AppListService::Get(chrome::HOST_DESKTOP_TYPE_NATIVE)->
         GetProfilePath(user_data_dir);
   }
 
   return g_browser_process->profile_manager()->GetLastUsedProfileDir(
       user_data_dir);
 }