Loading the Launcher with a Locked Profile launched UserManager.

chrome/browser/ui/app_list/app_list_service_impl.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/app_list/app_list_service_impl.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/app_list/app_list_view_delegate.h"
 #include "chrome/browser/ui/app_list/profile_loader.h"
 #include "chrome/browser/ui/app_list/profile_store.h"
+#include "chrome/browser/ui/user_manager.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "ui/app_list/app_list_model.h"
 
 namespace {
 
 const int kDiscoverabilityTimeoutMinutes = 60;
 
 void SendAppListAppLaunch(int count) {
@@ skipping 85 matching lines @@
       case Profile::CREATE_STATUS_REMOTE_FAIL:
       case Profile::CREATE_STATUS_CANCELED:
         break;
       case Profile::MAX_CREATE_STATUS:
         NOTREACHED();
         break;
     }
   }
 
   Profile* GetProfileByPath(const base::FilePath& path) override {
+    if (IsProfileLocked(path))

[tapted, 2015/01/21 22:47:20]

nit: I'm pretty sure this can this be DCHECK(!IsProfileLocked(path)).

[Mike Lerman, 2015/01/23 16:58:33]

Oop, thanks! I had meant to remove this completely, but a DCHECK makes sense too
:)

+      return nullptr;
     return profile_manager_->GetProfileByPath(path);
   }
 
   base::FilePath GetUserDataDir() override {
     return profile_manager_->user_data_dir();
   }
 
   bool IsProfileSupervised(const base::FilePath& profile_path) override {
     ProfileInfoCache& profile_info =
         g_browser_process->profile_manager()->GetProfileInfoCache();
     size_t profile_index = profile_info.GetIndexOfProfileWithPath(profile_path);
     return profile_index != std::string::npos &&
         profile_info.ProfileIsSupervisedAtIndex(profile_index);
   }
 
+  bool IsProfileLocked(const base::FilePath& profile_path) override {
+    ProfileInfoCache& profile_info =
+        g_browser_process->profile_manager()->GetProfileInfoCache();
+    size_t profile_index = profile_info.GetIndexOfProfileWithPath(profile_path);
+    return profile_index != std::string::npos &&
+        profile_info.ProfileIsSigninRequiredAtIndex(profile_index);
+  }
+
  private:
   ProfileManager* profile_manager_;
   base::WeakPtrFactory<ProfileStoreImpl> weak_factory_;
 };
 
 void RecordAppListDiscoverability(PrefService* local_state,
                                   bool is_startup_check) {
   // Since this task may be delayed, ensure it does not interfere with shutdown
   // when they unluckily coincide.
   if (browser_shutdown::IsTryingToQuit())
@@ skipping 256 matching lines @@
   if (!base::MessageLoop::current())
     return;  // In a unit test.
 
   // Send app list usage stats after a delay.
   const int kSendUsageStatsDelay = 5;
   base::MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&AppListServiceImpl::SendAppListStats),
       base::TimeDelta::FromSeconds(kSendUsageStatsDelay));
 }