Additional tracing and histogram in Extensions startup.

chrome/browser/extensions/external_provider_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/extensions/external_provider_impl.h"
 
 #include <set>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_util.h"
+#include "base/trace_event/trace_event.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_management.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/external_component_loader.h"
 #include "chrome/browser/extensions/external_policy_loader.h"
 #include "chrome/browser/extensions/external_pref_loader.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 329 matching lines @@
     *location = loc;
 
   return true;
 }
 
 // static
 void ExternalProviderImpl::CreateExternalProviders(
     VisitorInterface* service,
     Profile* profile,
     ProviderCollection* provider_list) {
+  TRACE_EVENT0("browser,startup",
+               "ExternalProviderImpl::CreateExternalProviders");
   scoped_refptr<ExternalLoader> external_loader;
   scoped_refptr<ExternalLoader> external_recommended_loader;
   extensions::Manifest::Location crx_location = Manifest::INVALID_LOCATION;
 #if defined(OS_CHROMEOS)
   policy::BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   bool is_chrome_os_public_session = false;
   const user_manager::User* user =
       chromeos::ProfileHelper::Get()->GetUserByProfile(profile);
   policy::DeviceLocalAccount::Type account_type;
@@ skipping 202 matching lines @@
       new ExternalProviderImpl(
           service,
           new ExternalComponentLoader(profile),
           profile,
           Manifest::INVALID_LOCATION,
           Manifest::EXTERNAL_COMPONENT,
           Extension::FROM_WEBSTORE | Extension::WAS_INSTALLED_BY_DEFAULT)));
 }
 
 }  // namespace extensions