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

chrome/browser/signin/signin_names_io_thread_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop/message_loop.h"
 #include "base/observer_list.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
@@ skipping 73 matching lines @@
   SimulateSignin(email);
 
   const SigninNamesOnIOThread::EmailSet& emails = signin_names_.GetEmails();
   ASSERT_EQ(1u, emails.size());
   ASSERT_EQ(1u, emails.count(email));
 }
 
 TEST_F(SigninNamesOnIOThreadTest, Signout) {
   const base::string16 email = base::UTF8ToUTF16("foo@gmail.com");
   SimulateSignin(email);
-  signin_manager_->SignOut();
+  signin_manager_->SignOut(signin_metrics::SIGNOUT_TEST);
 
   const SigninNamesOnIOThread::EmailSet& emails = signin_names_.GetEmails();
   ASSERT_EQ(0u, emails.size());
 }
 
 TEST_F(SigninNamesOnIOThreadTest, StartWithConnectedProfiles) {
   // Setup a couple of connected profiles, and one unconnected.
   const base::string16 email1 = base::UTF8ToUTF16("foo@gmail.com");
   const base::string16 email2 = base::UTF8ToUTF16("bar@gmail.com");
   AddNewProfile(base::UTF8ToUTF16("foo"), email1);
   AddNewProfile(base::UTF8ToUTF16("bar"), email2);
   AddNewProfile(base::UTF8ToUTF16("toto"), base::string16());
 
   SigninNamesOnIOThread signin_names;
 
   const SigninNamesOnIOThread::EmailSet& emails = signin_names.GetEmails();
   ASSERT_EQ(2u, emails.size());
   ASSERT_EQ(1u, emails.count(email1));
   ASSERT_EQ(1u, emails.count(email2));
 
   signin_names.ReleaseResourcesOnUIThread();
 }