Only showing the new multi user menus when there are at least 2 suitable users known to the system

chrome/browser/ui/ash/chrome_shell_delegate.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/ui/ash/chrome_shell_delegate.h"
 
 #include "apps/native_app_window.h"
 #include "apps/shell_window.h"
 #include "apps/shell_window_registry.h"
 #include "ash/host/root_window_host_factory.h"
@@ skipping 23 matching lines @@
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/user_metrics.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/aura/window.h"
 #include "ui/base/l10n/l10n_util.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/login/default_pinned_apps_field_trial.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
 #endif
 
 // static
 ChromeShellDelegate* ChromeShellDelegate::instance_ = NULL;
 
 namespace {
 
 void RestoreTabUsingProfile(Profile* profile) {
   TabRestoreService* service = TabRestoreServiceFactory::GetForProfile(profile);
   service->RestoreMostRecentEntry(NULL, chrome::HOST_DESKTOP_TYPE_ASH);
@@ skipping 50 matching lines @@
   instance_ = this;
   PlatformInit();
 }
 
 ChromeShellDelegate::~ChromeShellDelegate() {
   if (instance_ == this)
     instance_ = NULL;
 }
 
 bool ChromeShellDelegate::IsMultiProfilesEnabled() const {
-  return CommandLine::ForCurrentProcess()->HasSwitch(switches::kMultiProfiles);
+  // TODO(skuhne): There is a function named profiles::IsMultiProfilesEnabled
+  // which does similar things - but it is not the same. We should investigate
+  // if these two could be folded together.
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(switches::kMultiProfiles))
+    return false;
+#if defined(OS_CHROMEOS)
+  // If there is a user manager, we need to see that we can at least have 2
+  // simultaneous users to allow this feature.
+  if (chromeos::UserManager::IsInitialized() &&
+      chromeos::UserManager::Get()->GetUsersAdmittedForMultiProfile().size() +
+      chromeos::UserManager::Get()->GetLoggedInUsers().size() <= 1)
+    return false;
+#endif
+  return true;
 }
 
 bool ChromeShellDelegate::IsRunningInForcedAppMode() const {
   return chrome::IsRunningInForcedAppMode();
 }
 
 void ChromeShellDelegate::Exit() {
   chrome::AttemptUserExit();
 }
 
@@ skipping 304 matching lines @@
     return browser;
   return chrome::FindOrCreateTabbedBrowser(
       ProfileManager::GetDefaultProfileOrOffTheRecord(),
       chrome::HOST_DESKTOP_TYPE_ASH);
 }
 
 keyboard::KeyboardControllerProxy*
     ChromeShellDelegate::CreateKeyboardControllerProxy() {
   return new AshKeyboardControllerProxy();
 }