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

chrome/browser/sync/profile_sync_service_unittest.cc

Index: chrome/browser/sync/profile_sync_service_unittest.cc
diff --git a/chrome/browser/sync/profile_sync_service_unittest.cc b/chrome/browser/sync/profile_sync_service_unittest.cc
index 8e80aa22ca2902cdbe88faad410c11f18cb33914..44361a292e81790ecb4ac889dc48e86c7e3e5ac0 100644
--- a/chrome/browser/sync/profile_sync_service_unittest.cc
+++ b/chrome/browser/sync/profile_sync_service_unittest.cc
@@ -208,7 +208,8 @@ class ProfileSyncServiceTest : public ::testing::Test {
 #if defined(OS_WIN) || defined(OS_MACOSX) || (defined(OS_LINUX) && !defined(OS_CHROMEOS))
   void CreateServiceWithoutSignIn() {
     CreateService(browser_sync::MANUAL_START);
-    SigninManagerFactory::GetForProfile(profile())->SignOut();
+    SigninManagerFactory::GetForProfile(profile())->SignOut(
+        signin_metrics::SIGNOUT_TEST);
     service()->SetBackupStartDelayForTest(
         base::TimeDelta::FromMilliseconds(100));
   }
@@ -430,7 +431,8 @@ TEST_F(ProfileSyncServiceTest, EnableSyncAndSignOutDesktop) {
       sync_driver::prefs::kSyncSuppressStart));
   EXPECT_EQ(ProfileSyncService::SYNC, service()->backend_mode());
 
-  SigninManagerFactory::GetForProfile(profile())->SignOut();
+  SigninManagerFactory::GetForProfile(profile())->SignOut(
+      signin_metrics::SIGNOUT_TEST);
   EXPECT_TRUE(service()->sync_initialized());
   EXPECT_EQ(ProfileSyncService::BACKUP, service()->backend_mode());
 }
@@ -446,7 +448,8 @@ TEST_F(ProfileSyncServiceTest, EnableSyncAndSignOut) {
   EXPECT_FALSE(profile()->GetPrefs()->GetBoolean(
       sync_driver::prefs::kSyncSuppressStart));
 
-  SigninManagerFactory::GetForProfile(profile())->SignOut();
+  SigninManagerFactory::GetForProfile(profile())->SignOut(
+      signin_metrics::SIGNOUT_TEST);
   EXPECT_FALSE(service()->sync_initialized());
 }
 #endif  // !defined(OS_CHROMEOS)