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

chrome/browser/signin/fake_signin_manager.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 "chrome/browser/signin/fake_signin_manager.h"
 
 #include "base/callback_helpers.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/chrome_signin_client_factory.h"
@@ skipping 77 matching lines @@
                                const std::string& password) {
   StartSignInWithRefreshToken(
       std::string(), username, password, OAuthTokenFetchedCallback());
   CompletePendingSignin();
 }
 
 void FakeSigninManager::FailSignin(const GoogleServiceAuthError& error) {
   FOR_EACH_OBSERVER(Observer, observer_list_, GoogleSigninFailed(error));
 }
 
-void FakeSigninManager::SignOut() {
+void FakeSigninManager::SignOut(
+    signin_metrics::ProfileSignout signout_source_metric) {
   if (IsSignoutProhibited())
     return;
   set_auth_in_progress(std::string());
   set_password(std::string());
   const std::string username = authenticated_username_;
   authenticated_username_.clear();
 
   FOR_EACH_OBSERVER(SigninManagerBase::Observer, observer_list_,
                     GoogleSignedOut(username));
 }
 
 #endif  // !defined (OS_CHROMEOS)