Introduce profile for lock screen apps

chrome/browser/chromeos/login/easy_unlock/easy_unlock_tpm_key_manager_factory.cc

 // Copyright 2014 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/easy_unlock/easy_unlock_tpm_key_manager_factory.h"
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/login/easy_unlock/easy_unlock_tpm_key_manager.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
@@ skipping 46 matching lines @@
           BrowserContextDependencyManager::GetInstance()) {
 }
 
 EasyUnlockTpmKeyManagerFactory::~EasyUnlockTpmKeyManagerFactory() {
 }
 
 KeyedService* EasyUnlockTpmKeyManagerFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = Profile::FromBrowserContext(context);
   const user_manager::User* user = NULL;
+  if (chromeos::ProfileHelper::IsLockScreenAppProfile(profile))
+    return nullptr;
   if (!chromeos::ProfileHelper::IsSigninProfile(profile))
     user = chromeos::ProfileHelper::Get()->GetUserByProfile(profile);
   return new EasyUnlockTpmKeyManager(
       user ? user->GetAccountId() : EmptyAccountId(),
       user ? user->username_hash() : std::string(), GetLocalState());
 }
 
 content::BrowserContext* EasyUnlockTpmKeyManagerFactory::GetBrowserContextToUse(
       content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }