Additional tracing and histogram in Extensions startup.

Followed a local Linux machine which was slower than expected to where the time was going. Stopped at the ExtensionManagement::Refresh level, and will measure if this is general slow.

BUG=454789

Review URL: https://codereview.chromium.org/977673002

Cr-Commit-Position: refs/heads/master@{#319173}

2 files changed, 5 insertions, 0 deletions

diff --git a/components/keyed_service/core/keyed_service_base_factory.cc b/components/keyed_service/core/keyed_service_base_factory.cc
index ddaf497..7157c0e 100644
--- a/components/keyed_service/core/keyed_service_base_factory.cc
+++ b/components/keyed_service/core/keyed_service_base_factory.cc
@@ -6,10 +6,13 @@
 
 #include "base/prefs/pref_service.h"
 #include "base/supports_user_data.h"
+#include "base/trace_event/trace_event.h"
 #include "components/keyed_service/core/dependency_manager.h"
 
 void KeyedServiceBaseFactory::RegisterUserPrefsOnContextForTest(
     base::SupportsUserData* context) {
+  TRACE_EVENT0("browser,startup",
+               "KeyedServiceBaseFactory::RegisterUserPrefsOnContextForTest");
   // Safe timing for pref registration is hard. Previously, we made
   // context responsible for all pref registration on every service
   // that used contexts. Now we don't and there are timing issues.
diff --git a/components/keyed_service/core/keyed_service_factory.cc b/components/keyed_service/core/keyed_service_factory.cc
index 261ff29d..1417bab 100644
--- a/components/keyed_service/core/keyed_service_factory.cc
+++ b/components/keyed_service/core/keyed_service_factory.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/stl_util.h"
+#include "base/trace_event/trace_event.h"
 #include "components/keyed_service/core/dependency_manager.h"
 #include "components/keyed_service/core/keyed_service.h"
 
@@ -58,6 +59,7 @@ KeyedService* KeyedServiceFactory::SetTestingFactoryAndUse(
 KeyedService* KeyedServiceFactory::GetServiceForContext(
     base::SupportsUserData* context,
     bool create) {
+  TRACE_EVENT0("browser,startup", "KeyedServiceFactory::GetServiceForContext");
   context = GetContextToUse(context);
   if (!context)
     return nullptr;