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

chrome/browser/ui/zoom/zoom_controller_browsertest.cc

Index: chrome/browser/ui/zoom/zoom_controller_browsertest.cc
diff --git a/chrome/browser/ui/zoom/zoom_controller_browsertest.cc b/chrome/browser/ui/zoom/zoom_controller_browsertest.cc
index d8bcbddfabd687c2b0024ad45199c81e0b2fdd7d..68c43c40f549c196c11a572d04d0cfcc9ebe7846 100644
--- a/chrome/browser/ui/zoom/zoom_controller_browsertest.cc
+++ b/chrome/browser/ui/zoom/zoom_controller_browsertest.cc
@@ -276,8 +276,8 @@ IN_PROC_BROWSER_TEST_F(ZoomControllerBrowserTest, NavigationResetsManualMode) {
 // Regression test: crbug.com/438979.
 IN_PROC_BROWSER_TEST_F(ZoomControllerBrowserTest,
                        SettingsZoomAfterSigninWorks) {
-  GURL signin_url(
-      std::string(chrome::kChromeUIChromeSigninURL).append("?source=0"));
+  GURL signin_url(std::string(chrome::kChromeUIChromeSigninURL)
+                      .append("?access_point=0&reason=0"));
   // We open the signin page in a new tab so that the ZoomController is
   // created against the HostZoomMap of the special StoragePartition that
   // backs the signin page. When we subsequently navigate away from the