Start ARC and sign in after Chrome OS login

chrome/browser/chromeos/arc/arc_play_store_enabled_preference_handler.cc

 // Copyright 2017 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/arc/arc_play_store_enabled_preference_handler.h"
 
 #include "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/wm_shell.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "chrome/browser/chromeos/arc/arc_auth_notification.h"
 #include "chrome/browser/chromeos/arc/arc_optin_uma.h"
 #include "chrome/browser/chromeos/arc/arc_session_manager.h"
 #include "chrome/browser/chromeos/arc/arc_support_host.h"
 #include "chrome/browser/chromeos/arc/arc_util.h"
 #include "chrome/browser/prefs/pref_service_syncable_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/chromeos_switches.h"
+#include "components/arc/arc_util.h"
 #include "components/sync_preferences/pref_service_syncable.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace arc {
 
 ArcPlayStoreEnabledPreferenceHandler::ArcPlayStoreEnabledPreferenceHandler(
     Profile* profile,
     ArcSessionManager* arc_session_manager)
     : profile_(profile),
       arc_session_manager_(arc_session_manager),
@@ skipping 82 matching lines @@
   arc_session_manager_->NotifyArcPlayStoreEnabledChanged(is_play_store_enabled);
 }
 
 void ArcPlayStoreEnabledPreferenceHandler::UpdateArcSessionManager() {
   auto* support_host = arc_session_manager_->support_host();
   if (support_host) {
     support_host->SetArcManaged(
         IsArcPlayStoreEnabledPreferenceManagedForProfile(profile_));
   }
 
-  if (IsArcPlayStoreEnabledForProfile(profile_))
+  if (ShouldArcAlwaysStart() || IsArcPlayStoreEnabledForProfile(profile_))
     arc_session_manager_->RequestEnable();
   else
     arc_session_manager_->RequestDisable();
 }
 
 void ArcPlayStoreEnabledPreferenceHandler::OnIsSyncingChanged() {
   sync_preferences::PrefServiceSyncable* const pref_service_syncable =
       PrefServiceSyncableFromProfile(profile_);
   if (!pref_service_syncable->IsSyncing())
     return;
   pref_service_syncable->RemoveObserver(this);
 
   // TODO(hidehiko): Extract kEnableArcOOBEOptIn check as a utility method.
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
           chromeos::switches::kEnableArcOOBEOptIn) &&
       profile_->IsNewProfile() &&
       !profile_->GetPrefs()->HasPrefPath(prefs::kArcEnabled)) {
     ArcAuthNotification::Show(profile_);
   }
 }
 
 }  // namespace arc