Adding shutdown tracing capabilities

chrome/browser/browser_process_impl.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/browser_process_impl.h"
 
 #include <algorithm>
 #include <map>
 #include <vector>
 
@@ skipping 179 matching lines @@
   message_center::MessageCenter::Initialize();
 }
 
 BrowserProcessImpl::~BrowserProcessImpl() {
   tracked_objects::ThreadData::EnsureCleanupWasCalled(4);
 
   g_browser_process = NULL;
 }
 
 void BrowserProcessImpl::StartTearDown() {
+    TRACE_EVENT0("shutdown", "BrowserProcessImpl::StartTearDown");
 #if defined(ENABLE_AUTOMATION)
   // Delete the AutomationProviderList before NotificationService,
   // since it may try to unregister notifications
   // Both NotificationService and AutomationProvider are singleton instances in
   // the BrowserProcess. Since AutomationProvider may have some active
   // notification observers, it is essential that it gets destroyed before the
   // NotificationService. NotificationService won't be destroyed until after
   // this destructor is run.
   automation_provider_list_.reset();
 #endif
@@ skipping 18 matching lines @@
   if (safe_browsing_service_.get())
     safe_browsing_service()->ShutDown();
 #endif
 
   // Need to clear the desktop notification balloons before the io_thread_ and
   // before the profiles, since if there are any still showing we will access
   // those things during teardown.
   notification_ui_manager_.reset();
 
   // Need to clear profiles (download managers) before the io_thread_.
-  profile_manager_.reset();
+  {
+    TRACE_EVENT0("shutdown",
+                 "BrowserProcessImpl::StartTearDown:ProfileManager");
+    profile_manager_.reset();
+  }
 
 #if !defined(OS_ANDROID)
   // Debugger must be cleaned up before IO thread and NotificationService.
   remote_debugging_server_.reset();
 #endif
 
   ExtensionRendererState::GetInstance()->Shutdown();
 
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
   media_file_system_registry_.reset();
@@ skipping 807 matching lines @@
 }
 
 void BrowserProcessImpl::OnAutoupdateTimer() {
   if (CanAutorestartForUpdate()) {
     DLOG(WARNING) << "Detected update.  Restarting browser.";
     RestartBackgroundInstance();
   }
 }
 
 #endif  // (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)