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

chrome/browser/ui/chrome_pages.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_CHROME_PAGES_H_
 #define CHROME_BROWSER_UI_CHROME_PAGES_H_
 
 #include <string>
 
 #include "chrome/browser/ui/host_desktop.h"
@@ skipping 74 matching lines @@
 void ShowSettingsSubPageInTabbedBrowser(Browser* browser,
                                         const std::string& sub_page);
 void ShowClearBrowsingDataDialog(Browser* browser);
 void ShowPasswordManager(Browser* browser);
 void ShowImportDialog(Browser* browser);
 void ShowAboutChrome(Browser* browser);
 void ShowSearchEngineSettings(Browser* browser);
 
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 // Initiates signin in a new browser tab.
-void ShowBrowserSignin(Browser* browser, signin_metrics::Source source);
+void ShowBrowserSignin(Browser* browser,
+                       signin_metrics::AccessPoint access_point);
 
 // If the user is already signed in, shows the "Signin" portion of Settings,
 // otherwise initiates signin in a new browser tab.
 void ShowBrowserSigninOrSettings(Browser* browser,
-                                 signin_metrics::Source source);
+                                 signin_metrics::AccessPoint access_point);
 #endif
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_CHROME_PAGES_H_