Additional tracing and histogram in Extensions startup.

chrome/browser/extensions/extension_management.cc

 // Copyright 2014 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/extension_management.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
+#include "base/trace_event/trace_event.h"
 #include "base/version.h"
 #include "chrome/browser/extensions/extension_management_constants.h"
 #include "chrome/browser/extensions/extension_management_internal.h"
 #include "chrome/browser/extensions/external_policy_loader.h"
 #include "chrome/browser/extensions/external_provider_impl.h"
 #include "chrome/browser/extensions/permissions_based_management_policy_provider.h"
 #include "chrome/browser/extensions/standard_management_policy_provider.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/crx_file/id_util.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "extensions/browser/pref_names.h"
 #include "extensions/common/manifest_constants.h"
 #include "extensions/common/permissions/api_permission_set.h"
 #include "extensions/common/permissions/permission_set.h"
 #include "extensions/common/url_pattern.h"
 #include "url/gurl.h"
 
 namespace extensions {
 
 ExtensionManagement::ExtensionManagement(PrefService* pref_service)
     : pref_service_(pref_service) {
+  TRACE_EVENT0("browser,startup",
+               "ExtensionManagement::ExtensionManagement::ctor");
   pref_change_registrar_.Init(pref_service_);
   base::Closure pref_change_callback = base::Bind(
       &ExtensionManagement::OnExtensionPrefChanged, base::Unretained(this));
   pref_change_registrar_.Add(pref_names::kInstallAllowList,
                              pref_change_callback);
   pref_change_registrar_.Add(pref_names::kInstallDenyList,
                              pref_change_callback);
   pref_change_registrar_.Add(pref_names::kInstallForceList,
                              pref_change_callback);
   pref_change_registrar_.Add(pref_names::kAllowedInstallSites,
@@ skipping 179 matching lines @@
     return true;
   bool meets_requirement = extension->version()->CompareTo(
                              *iter->second->minimum_version_required) >= 0;
   // Output a human readable version string for prompting if necessary.
   if (!meets_requirement && required_version)
     *required_version = iter->second->minimum_version_required->GetString();
   return meets_requirement;
 }
 
 void ExtensionManagement::Refresh() {
+  TRACE_EVENT0("browser,startup", "ExtensionManagement::Refresh");
+  SCOPED_UMA_HISTOGRAM_TIMER("Extensions.ExtensionManagement_RefreshTime");
   // Load all extension management settings preferences.
   const base::ListValue* allowed_list_pref =
       static_cast<const base::ListValue*>(LoadPreference(
           pref_names::kInstallAllowList, true, base::Value::TYPE_LIST));
   // Allow user to use preference to block certain extensions. Note that policy
   // managed forcelist or whitelist will always override this.
   const base::ListValue* denied_list_pref =
       static_cast<const base::ListValue*>(LoadPreference(
           pref_names::kInstallDenyList, false, base::Value::TYPE_LIST));
   const base::DictionaryValue* forced_list_pref =
@@ skipping 220 matching lines @@
     : BrowserContextKeyedServiceFactory(
           "ExtensionManagement",
           BrowserContextDependencyManager::GetInstance()) {
 }
 
 ExtensionManagementFactory::~ExtensionManagementFactory() {
 }
 
 KeyedService* ExtensionManagementFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
+  TRACE_EVENT0("browser,startup",
+               "ExtensionManagementFactory::BuildServiceInstanceFor");
   return new ExtensionManagement(
       Profile::FromBrowserContext(context)->GetPrefs());
 }
 
 content::BrowserContext* ExtensionManagementFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 void ExtensionManagementFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* user_prefs) {
   user_prefs->RegisterDictionaryPref(
       pref_names::kExtensionManagement,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 }  // namespace extensions