Implement newly designed sign-in related histograms for desktop platorms.

chrome/browser/ui/startup/startup_browser_creator_impl.cc

Index: chrome/browser/ui/startup/startup_browser_creator_impl.cc
diff --git a/chrome/browser/ui/startup/startup_browser_creator_impl.cc b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
index 680f94f014c1f04cf5469d1fa298fe08112c415d..efd14034631965b0fa36a246ce6a48524f3337df 100644
--- a/chrome/browser/ui/startup/startup_browser_creator_impl.cc
+++ b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
@@ -872,7 +872,8 @@ void StartupBrowserCreatorImpl::AddStartupURLs(
     signin::DidShowPromoAtStartup(profile_);
 
     const GURL sync_promo_url = signin::GetPromoURL(
-        signin_metrics::SOURCE_START_PAGE, false);
+        signin_metrics::ACCESS_POINT_START_PAGE,
+        signin_metrics::REASON_SIGNIN_PRIMARY_ACCOUNT, false);
 
     // No need to add if the sync promo is already in the startup list.
     bool add_promo = true;