Adding instrumentation to locate the source of jankiness.

components/search_engines/template_url_service.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 "components/search_engines/template_url_service.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 1607 matching lines @@
   for (TemplateURLVector::const_iterator i = first_invalid; i != urls->end();
        ++i)
     AddNoNotify(*i, true);
 
   // Clear the input vector to reduce the chance callers will try to use a
   // (possibly deleted) entry.
   urls->clear();
 }
 
 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();
 }
 
 bool TemplateURLService::CanReplaceKeywordForHost(
     const std::string& host,
     TemplateURL** to_replace) {
   DCHECK(!to_replace || !*to_replace);
   const TemplateURLSet* urls = provider_map_->GetURLsForHost(host);
   if (!urls)
     return true;
@@ skipping 774 matching lines @@
 
   if (most_recently_intalled_default) {
     base::AutoReset<DefaultSearchChangeOrigin> change_origin(
         &dsp_change_origin_, DSP_CHANGE_OVERRIDE_SETTINGS_EXTENSION);
     default_search_manager_.SetExtensionControlledDefaultSearchEngine(
         most_recently_intalled_default->data());
   } else {
     default_search_manager_.ClearExtensionControlledDefaultSearchEngine();
   }
 }