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

chrome/browser/profiles/gaia_info_update_service_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 "chrome/browser/profiles/gaia_info_update_service.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile_downloader.h"
@@ skipping 155 matching lines @@
   gfx::Image gaia_picture = gfx::test::CreateImage();
   GetCache()->SetGAIAPictureOfProfileAtIndex(0, &gaia_picture);
 
   // Set a fake picture URL.
   profile()->GetPrefs()->SetString(prefs::kProfileGAIAInfoPictureURL,
                                    "example.com");
 
   EXPECT_FALSE(service()->GetCachedPictureURL().empty());
 
   // Log out.
-  signin_manager->SignOut();
+  signin_manager->SignOut(signin_metrics::SIGNOUT_TEST);
   // Verify that the GAIA name and picture, and picture URL are unset.
   EXPECT_TRUE(GetCache()->GetGAIANameOfProfileAtIndex(0).empty());
   EXPECT_EQ(NULL, GetCache()->GetGAIAPictureOfProfileAtIndex(0));
   EXPECT_TRUE(service()->GetCachedPictureURL().empty());
 }
 
 TEST_F(GAIAInfoUpdateServiceTest, LogIn) {
   // Log in.
   EXPECT_CALL(*service(), Update());
   SigninManager* signin_manager =
       SigninManagerFactory::GetForProfile(profile());
   signin_manager->OnExternalSigninCompleted("pat@example.com");
 }
 
 #endif