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

chrome/browser/ui/sync/one_click_signin_sync_starter.cc

Index: chrome/browser/ui/sync/one_click_signin_sync_starter.cc
diff --git a/chrome/browser/ui/sync/one_click_signin_sync_starter.cc b/chrome/browser/ui/sync/one_click_signin_sync_starter.cc
index 2353921c46179af2c444a2504b985c48074954e4..0d0a0f9e16ede0e13abb3f741f4c34b4fc1ce6ad 100644
--- a/chrome/browser/ui/sync/one_click_signin_sync_starter.cc
+++ b/chrome/browser/ui/sync/one_click_signin_sync_starter.cc
@@ -38,6 +38,7 @@
 #include "chrome/browser/ui/webui/signin/profile_signin_confirmation_dialog.h"
 #include "chrome/common/url_constants.h"
 #include "components/signin/core/browser/signin_manager.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 "grit/chromium_strings.h"
@@ -279,6 +280,7 @@ void OneClickSigninSyncStarter::CompleteInitForNewProfile(
       // the signin for the original profile was cancelled (must do this after
       // we have called Initialize() with the new profile, as otherwise this
       // object will get freed when the signin on the old profile is cancelled.
+      signin_metrics::LogSignout(signin_metrics::TRANSFER_CREDENTIALS);
       old_signin_manager->SignOut();
 
       // Load policy for the just-created profile - once policy has finished
@@ -306,6 +308,7 @@ void OneClickSigninSyncStarter::CompleteInitForNewProfile(
 #endif
 
 void OneClickSigninSyncStarter::CancelSigninAndDelete() {
+  signin_metrics::LogSignout(signin_metrics::ABORT_SIGNIN);
   SigninManagerFactory::GetForProfile(profile_)->SignOut();
   // The statement above results in a call to SigninFailed() which will free
   // this object, so do not refer to the OneClickSigninSyncStarter object