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

chrome/browser/ui/webui/settings/sync_handler.h

Index: chrome/browser/ui/webui/settings/sync_handler.h
diff --git a/chrome/browser/ui/webui/settings/sync_handler.h b/chrome/browser/ui/webui/settings/sync_handler.h
index 9ac84ba6d1838207536e34ab131776605753a9f7..2de271957a5fcbddcb9d4b99db775199621d50c6 100644
--- a/chrome/browser/ui/webui/settings/sync_handler.h
+++ b/chrome/browser/ui/webui/settings/sync_handler.h
@@ -10,10 +10,12 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/scoped_observer.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/sync/sync_startup_tracker.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service.h"
 #include "components/signin/core/browser/signin_manager_base.h"
+#include "components/signin/core/browser/signin_metrics.h"
 #include "components/sync_driver/sync_service_observer.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
@@ -59,7 +61,7 @@ class SyncHandler : public content::WebUIMessageHandler,
   void OnStateChanged() override;
 
   // Initializes the sync setup flow and shows the setup UI.
-  void OpenSyncSetup();
+  void OpenSyncSetup(const base::ListValue* args);
 
   // Shows advanced configuration dialog without going through sign in dialog.
   // Kicks the sync backend if necessary with showing spinner dialog until it
@@ -126,11 +128,12 @@ class SyncHandler : public content::WebUIMessageHandler,
 
 #if !defined(OS_CHROMEOS)
   // Displays the GAIA login form.
-  void DisplayGaiaLogin();
+  void DisplayGaiaLogin(signin_metrics::AccessPoint access_point);
 
   // When web-flow is enabled, displays the Gaia login form in a new tab.
   // This function is virtual so that tests can override.
-  virtual void DisplayGaiaLoginInNewTabOrWindow();
+  virtual void DisplayGaiaLoginInNewTabOrWindow(
+      signin_metrics::AccessPoint access_point);
 #endif
 
   // A utility function to call before actually showing setup dialog. Makes sure