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 b56e1b5c8ffa114efd16ec203fbfa82c79367c39..6fbe239cc75b1edca74f2b9b5091f716fb3ef292 100644
--- a/components/search_engines/template_url_service.cc
+++ b/components/search_engines/template_url_service.cc
@@ -15,6 +15,7 @@
 #include "base/memory/scoped_vector.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
@@ -825,6 +826,11 @@ scoped_ptr<TemplateURLService::Subscription>
 void TemplateURLService::OnWebDataServiceRequestDone(
     KeywordWebDataService::Handle h,
     const WDTypedResult* result) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 TemplateURLService::OnWebDataServiceRequestDone"));
+
   // Reset the load_handle so that we don't try and cancel the load in
   // the destructor.
   load_handle_ = 0;