Adding instrumentation to locate the source of jankiness

components/signin/core/browser/account_tracker_service.cc

Index: components/signin/core/browser/account_tracker_service.cc
diff --git a/components/signin/core/browser/account_tracker_service.cc b/components/signin/core/browser/account_tracker_service.cc
index 4a6fdc6573ea81b18030b606bf0c7c07e3d0a626..2c5f2cb064127f8af4f026af1bc0aa2f15ec54b5 100644
--- a/components/signin/core/browser/account_tracker_service.cc
+++ b/components/signin/core/browser/account_tracker_service.cc
@@ -7,6 +7,7 @@
 #include "base/debug/trace_event.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
+#include "base/profiler/scoped_profile.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "components/signin/core/common/signin_pref_names.h"
@@ -257,6 +258,11 @@ AccountTrackerService::GetMigrationState(PrefService* pref_service) {
 
 void AccountTrackerService::OnRefreshTokenAvailable(
     const std::string& account_id) {
+  // TODO(vadimt): Remove ScopedProfile below once crbug.com/422460 is fixed.
+  tracked_objects::ScopedProfile tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422460 AccountTrackerService::OnRefreshTokenAvailable"));
+
   TRACE_EVENT1("AccountTrackerService",
                "AccountTracker::OnRefreshTokenAvailable",
                "account_id",