Add some tracing for Profiles and Extensions.

chrome/browser/extensions/installed_loader.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/extensions/installed_loader.h"
 
 #include "base/files/file_path.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
+#include "base/trace_event/trace_event.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_action_manager.h"
 #include "chrome/browser/extensions/extension_error_reporter.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/api/supervised_user_private/supervised_user_handler.h"
 #include "chrome/common/extensions/chrome_manifest_url_handlers.h"
@@ skipping 198 matching lines @@
     return;
   }
 
   if (write_to_prefs)
     extension_prefs_->UpdateManifest(extension.get());
 
   extension_service_->AddExtension(extension.get());
 }
 
 void InstalledLoader::LoadAllExtensions() {
+  TRACE_EVENT0("browser,startup", "InstalledLoader::LoadAllExtensions");
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   base::TimeTicks start_time = base::TimeTicks::Now();
 
   Profile* profile = extension_service_->profile();
   scoped_ptr<ExtensionPrefs::ExtensionsInfo> extensions_info(
       extension_prefs_->GetInstalledExtensionsInfo());
 
   std::vector<int> reload_reason_counts(NUM_MANIFEST_RELOAD_REASONS, 0);
   bool should_write_prefs = false;
@@ skipping 334 matching lines @@
 int InstalledLoader::GetCreationFlags(const ExtensionInfo* info) {
   int flags = extension_prefs_->GetCreationFlags(info->extension_id);
   if (!Manifest::IsUnpackedLocation(info->extension_location))
     flags |= Extension::REQUIRE_KEY;
   if (extension_prefs_->AllowFileAccess(info->extension_id))
     flags |= Extension::ALLOW_FILE_ACCESS;
   return flags;
 }
 
 }  // namespace extensions