Minimized windows should not be activated by another user in multiprofile scenario.

chrome/browser/ui/ash/chrome_shell_delegate_chromeos.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/ui/ash/chrome_shell_delegate.h"
 
 #include "ash/accelerators/magnifier_key_scroller.h"
 #include "ash/accelerators/spoken_feedback_toggler.h"
 #include "ash/accessibility_delegate.h"
 #include "ash/wm/mru_window_tracker.h"
@@ skipping 24 matching lines @@
 #include "chrome/grit/generated_resources.h"
 #include "chromeos/chromeos_switches.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/user_metrics.h"
 #include "ui/aura/window.h"
 #include "ui/base/ime/chromeos/input_method_manager.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace {
 
-void InitAfterSessionStart() {
+void InitAfterFirstSessionStart() {
   // Restore focus after the user session is started.  It's needed because some
   // windows can be opened in background while login UI is still active because
   // we currently restore browser windows before login UI is deleted.
   ash::Shell* shell = ash::Shell::GetInstance();
   ash::MruWindowTracker::WindowList mru_list =
       shell->mru_window_tracker()->BuildMruWindowList();
   if (!mru_list.empty())
     mru_list.front()->Focus();
 
   // Enable magnifier scroll keys as there may be no mouse cursor in kiosk mode.
@@ skipping 200 matching lines @@
       if (!chromeos::ProfileHelper::IsSigninProfile(profile) &&
           !profile->IsGuestSession() && !profile->IsSupervised()) {
         // Start the error notifier services to show auth/sync notifications.
         SigninErrorNotifierFactory::GetForProfile(profile);
         SyncErrorNotifierFactory::GetForProfile(profile);
       }
       ash::Shell::GetInstance()->OnLoginUserProfilePrepared();
       break;
     }
     case chrome::NOTIFICATION_SESSION_STARTED:
-      InitAfterSessionStart();
+      // InitAfterFirstSessionStart() should only be called once upon system
+      // start.
+      if (user_manager::UserManager::Get()->GetLoggedInUsers().size() < 2)
+        InitAfterFirstSessionStart();
       ash::Shell::GetInstance()->ShowShelf();
       break;
     default:
       NOTREACHED() << "Unexpected notification " << type;
   }
 }
 
 void ChromeShellDelegate::PlatformInit() {
   registrar_.Add(this,
                  chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED,
                  content::NotificationService::AllSources());
   registrar_.Add(this,
                  chrome::NOTIFICATION_SESSION_STARTED,
                  content::NotificationService::AllSources());
 }