Adding instrumentation to locate the source of jankiness.

components/search_engines/template_url_service.cc

Index: components/search_engines/template_url_service.cc
diff --git a/components/search_engines/template_url_service.cc b/components/search_engines/template_url_service.cc
index b9738e16e037dea21547dd3dd5e9792dc99260a0..20bd85539217e5d566d5f39030b567e9cf01fa3b 100644
--- a/components/search_engines/template_url_service.cc
+++ b/components/search_engines/template_url_service.cc
@@ -1625,17 +1625,33 @@ void TemplateURLService::SetTemplateURLs(TemplateURLVector* urls) {
 }
 
 void TemplateURLService::ChangeToLoadedState() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedTracker tracking_profile1(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 TemplateURLService::ChangeToLoadedState 1"));
+
   DCHECK(!loaded_);
 
   provider_map_->Init(template_urls_, search_terms_data());
   loaded_ = true;
 
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 TemplateURLService::ChangeToLoadedState 2"));
+
   // This will cause a call to NotifyObservers().
   ApplyDefaultSearchChangeNoMetrics(
       initial_default_search_provider_ ?
           &initial_default_search_provider_->data() : NULL,
       default_search_provider_source_);
   initial_default_search_provider_.reset();
+
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedTracker tracking_profile3(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 TemplateURLService::ChangeToLoadedState 3"));
+
   on_loaded_callbacks_.Notify();
 }