Log UMA metrics for multiprofile actions.

chrome/browser/chromeos/login/user_manager_impl.cc

 // Copyright (c) 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/chromeos/login/user_manager_impl.h"
 
 #include <cstddef>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 383 matching lines @@
   }
   DCHECK(active_user_);
   active_user_->set_is_logged_in(true);
   active_user_->set_is_active(true);
   active_user_->set_username_hash(username_hash);
 
   // Place user who just signed in to the top of the logged in users.
   logged_in_users_.insert(logged_in_users_.begin(), active_user_);
   SetLRUUser(active_user_);
 
-  if (!primary_user_)
+  if (!primary_user_) {
     primary_user_ = active_user_;
+    if (primary_user_->GetType() == User::USER_TYPE_REGULAR)
+      SendRegularUserLoginMetrics(email);
+  }
 
   UMA_HISTOGRAM_ENUMERATION("UserManager.LoginUserType",
                             active_user_->GetType(), User::NUM_USER_TYPES);
 
-  if (active_user_->GetType() == User::USER_TYPE_REGULAR)
-    SendRegularUserLoginMetrics(email);
+  if (IsMultipleProfilesAllowed()) {
+    UMA_HISTOGRAM_COUNTS_100("MultiProfile.UserCount",
+                             GetLoggedInUsers().size());
+  }
+
   g_browser_process->local_state()->SetString(kLastLoggedInRegularUser,
     (active_user_->GetType() == User::USER_TYPE_REGULAR) ? email : "");
 
   NotifyOnLogin();
 }
 
 void UserManagerImpl::SwitchActiveUser(const std::string& email) {
   if (!CommandLine::ForCurrentProcess()->HasSwitch(::switches::kMultiProfiles))
     return;
 
@@ skipping 1553 matching lines @@
   }
 }
 
 void UserManagerImpl::OnUserNotAllowed() {
   LOG(ERROR) << "Shutdown session because a user is not allowed to be in the "
                 "current session";
   chrome::AttemptUserExit();
 }
 
 }  // namespace chromeos