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

chrome/browser/signin/signin_manager_unittest.cc

Index: chrome/browser/signin/signin_manager_unittest.cc
diff --git a/chrome/browser/signin/signin_manager_unittest.cc b/chrome/browser/signin/signin_manager_unittest.cc
index c49673aaf59a72394fb71c409e07cea0fc171686..623a9e4cf477cb781093b8dfd1561dabf76bcd9b 100644
--- a/chrome/browser/signin/signin_manager_unittest.cc
+++ b/chrome/browser/signin/signin_manager_unittest.cc
@@ -230,7 +230,7 @@ TEST_F(SigninManagerTest, SignOut) {
       "user@gmail.com",
       "password",
       SigninManager::OAuthTokenFetchedCallback());
-  manager_->SignOut();
+  manager_->SignOut(signin_metrics::SIGNOUT_TEST);
   EXPECT_TRUE(manager_->GetAuthenticatedUsername().empty());
   // Should not be persisted anymore
   ShutDownManager();
@@ -245,10 +245,10 @@ TEST_F(SigninManagerTest, SignOutWhileProhibited) {
 
   manager_->SetAuthenticatedUsername("user@gmail.com");
   manager_->ProhibitSignout(true);
-  manager_->SignOut();
+  manager_->SignOut(signin_metrics::SIGNOUT_TEST);
   EXPECT_FALSE(manager_->GetAuthenticatedUsername().empty());
   manager_->ProhibitSignout(false);
-  manager_->SignOut();
+  manager_->SignOut(signin_metrics::SIGNOUT_TEST);
   EXPECT_TRUE(manager_->GetAuthenticatedUsername().empty());
 }