[Desktop FRE] Do not show Welcome if sign-in disabled

chrome/browser/ui/startup/startup_tab_provider.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_UI_STARTUP_STARTUP_TAB_PROVIDER_H_
 #define CHROME_BROWSER_UI_STARTUP_STARTUP_TAB_PROVIDER_H_
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ skipping 46 matching lines @@
   // The static helper methods below implement the policies relevant to the
   // respective Get*Tabs methods, but do not gather or interact with any
   // system state relating to making those policy decisions. Exposed for
   // testing.
 
   // Determines which tabs should be shown according to onboarding/first
   // run policy.
   static StartupTabs GetStandardOnboardingTabsForState(
       bool is_first_run,
       bool has_seen_welcome_page,
+      bool is_signin_allowed,
       bool is_signed_in,
       bool is_supervised_user);
 
 #if defined(OS_WIN)
   // Determines which tabs should be shown according to onboarding/first run
   // policy, including promo content specific to Windows 10.
   static StartupTabs GetWin10OnboardingTabsForState(
       bool is_first_run,
       bool has_seen_welcome_page,
       bool has_seen_win10_promo,
+      bool is_signin_allowed,
       bool is_signed_in,
       bool set_default_browser_allowed,
       bool is_default_browser,
       bool is_supervised_user);
 #endif
 
   // Processes first run URLs specified in Master Preferences file, replacing
   // any "magic word" URL hosts with appropriate URLs.
   static StartupTabs GetMasterPrefsTabsForState(
       bool is_first_run,
@@ skipping 49 matching lines @@
   StartupTabs GetPreferencesTabs(const base::CommandLine& command_line,
                                  Profile* profile) const override;
   StartupTabs GetNewTabPageTabs(const base::CommandLine& command_line,
                                 Profile* profile) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(StartupTabProviderImpl);
 };
 
 #endif  // CHROME_BROWSER_UI_STARTUP_STARTUP_TAB_PROVIDER_H_