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

chrome/browser/ui/webui/ntp/new_tab_page_sync_handler.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/webui/ntp/new_tab_page_sync_handler.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 112 matching lines @@
 }
 
 void NewTabPageSyncHandler::HandleSyncLinkClicked(const base::ListValue* args) {
   DCHECK(!waiting_for_initial_page_load_);
   if (!sync_service_ || !sync_service_->IsSyncAllowedByFlag())
     return;
   Browser* browser =
       chrome::FindBrowserWithWebContents(web_ui()->GetWebContents());
   if (!browser || browser->IsAttemptingToCloseBrowser())
     return;
-  chrome::ShowBrowserSignin(browser, signin_metrics::SOURCE_NTP_LINK);
+  chrome::ShowBrowserSignin(browser,
+                            signin_metrics::AccessPoint::ACCESS_POINT_NTP_LINK);
 
   if (sync_service_->HasSyncSetupCompleted()) {
     base::string16 user = base::UTF8ToUTF16(
         SigninManagerFactory::GetForProfile(Profile::FromWebUI(web_ui()))
             ->GetAuthenticatedAccountInfo()
             .email);
     base::DictionaryValue value;
     value.SetString("syncEnabledMessage",
                     l10n_util::GetStringFUTF16(IDS_SYNC_NTP_SYNCED_TO,
                     user));
@@ skipping 52 matching lines @@
       if (linkurl.empty()) {
         value.SetBoolean("linkurlisset", false);
       } else {
         value.SetBoolean("linkurlisset", true);
         value.SetString("linkurl", linkurl);
       }
     }
   }
   web_ui()->CallJavascriptFunction("ntp.syncMessageChanged", value);
 }