Adding shutdown tracing capabilities

chrome/browser/profiles/profile_destroyer.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/profiles/profile_destroyer.h"
 
 #include "base/bind.h"
+#include "base/debug/trace_event.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_process_host.h"
 
 
 namespace {
 
 const int64 kTimerDelaySeconds = 1;
 
 }  // namespace
 
 std::vector<ProfileDestroyer*>* ProfileDestroyer::pending_destroyers_ = NULL;
 
 // static
 void ProfileDestroyer::DestroyProfileWhenAppropriate(Profile* const profile) {
+  TRACE_EVENT0("shutdown", "ProfileDestroyer::DestroyProfileWhenAppropriate");
+
   DCHECK(profile);
   profile->MaybeSendDestroyedNotification();
 
   std::vector<content::RenderProcessHost*> hosts;
   // Testing profiles can simply be deleted directly. Some tests don't setup
   // RenderProcessHost correctly and don't necessary run on the UI thread
   // anyway, so we can't use the AllHostIterator.
   if (profile->AsTestingProfile() == NULL) {
     GetHostsForProfile(profile, &hosts);
     if (!profile->IsOffTheRecord() && profile->HasOffTheRecordProfile())
@@ skipping 141 matching lines @@
         content::RenderProcessHost::AllHostsIterator());
       !iter.IsAtEnd(); iter.Advance()) {
     content::RenderProcessHost* render_process_host = iter.GetCurrentValue();
     if (render_process_host && Profile::FromBrowserContext(
           render_process_host->GetBrowserContext()) == profile) {
       hosts->push_back(render_process_host);
     }
   }
   return !hosts->empty();
 }