Track when and how a profile is signed out via UMA.

chrome/browser/ui/webui/sync_setup_handler.cc

Index: chrome/browser/ui/webui/sync_setup_handler.cc
diff --git a/chrome/browser/ui/webui/sync_setup_handler.cc b/chrome/browser/ui/webui/sync_setup_handler.cc
index 7e71099760de32741241536d032a4f58bf537b81..49954d8568115156ed4b83f9a71a7955b6a77a6d 100644
--- a/chrome/browser/ui/webui/sync_setup_handler.cc
+++ b/chrome/browser/ui/webui/sync_setup_handler.cc
@@ -42,6 +42,7 @@
 #include "chrome/common/url_constants.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_error_controller.h"
+#include "components/signin/core/browser/signin_metrics.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "components/sync_driver/sync_prefs.h"
 #include "content/public/browser/render_view_host.h"
@@ -805,6 +806,7 @@ void SyncSetupHandler::HandleStartSignin(const base::ListValue* args) {
 void SyncSetupHandler::HandleStopSyncing(const base::ListValue* args) {
   if (GetSyncService())
     ProfileSyncService::SyncEvent(ProfileSyncService::STOP_FROM_OPTIONS);
+  signin_metrics::LogSignout(signin_metrics::USER_CLICKED_SIGNOUT);
   SigninManagerFactory::GetForProfile(GetProfile())->SignOut();
 
   bool delete_profile = false;
@@ -849,8 +851,10 @@ void SyncSetupHandler::CloseSyncSetup() {
         // Sign out the user on desktop Chrome if they click cancel during
         // initial setup.
         // TODO(rsimha): Revisit this for M30. See http://crbug.com/252049.
-        if (sync_service->FirstSetupInProgress())
+        if (sync_service->FirstSetupInProgress()) {
+          signin_metrics::LogSignout(signin_metrics::ABORT_SIGNIN);
           SigninManagerFactory::GetForProfile(GetProfile())->SignOut();
+        }
 #endif
       }
     }