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

chrome/browser/extensions/api/identity/account_tracker_unittest.cc

 // Copyright 2013 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/extensions/api/identity/account_tracker.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/strings/stringprintf.h"
@@ skipping 312 matching lines @@
 
   AccountTracker* account_tracker() {
     return account_tracker_.get();
   }
 
   // Helpers to pass fake events to the tracker.
 
   void NotifyRemoveAccount(const std::string& username) {
 #if !defined(OS_CHROMEOS)
     if (username == kPrimaryAccountKey)
-      fake_signin_manager_->SignOut();
+      fake_signin_manager_->SignOut(signin_metrics::SIGNOUT_TEST);
     else
       account_tracker()->GoogleSignedOut(username);
 #else
     account_tracker()->GoogleSignedOut(username);
 #endif
   }
 
   void NotifyTokenAvailable(const std::string& username) {
     fake_oauth2_token_service_->IssueRefreshTokenForUser(username,
                                                          "refresh_token");
@@ skipping 376 matching lines @@
   NotifyTokenAvailable("alpha@example.com");
   ReturnOAuthUrlFetchSuccess("alpha@example.com");
 
   NotifyTokenRevoked(kPrimaryAccountKey);
 
   std::vector<AccountIds> ids = account_tracker()->GetAccounts();
   EXPECT_EQ(0ul, ids.size());
 }
 
 }  // namespace extensions