Start ARC and sign in after Chrome OS login

chrome/browser/chromeos/arc/arc_session_manager.cc

 // 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.
 
 #include "chrome/browser/chromeos/arc/arc_session_manager.h"
 
 #include <utility>
 
 #include "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/wm_shell.h"
@@ skipping 426 matching lines @@
   if (support_host_) {
     support_host_->Close();
     support_host_->RemoveObserver(this);
     support_host_.reset();
   }
   context_.reset();
   profile_ = nullptr;
   SetState(State::NOT_INITIALIZED);
 }
 
-
 void ArcSessionManager::ShutdownSession() {
   arc_sign_in_timer_.Stop();
   playstore_launcher_.reset();
   terms_of_service_negotiator_.reset();
   android_management_checker_.reset();
   arc_session_runner_->RequestStop();
   // TODO(hidehiko): The ARC instance's stopping is asynchronous, so it might
   // still be running when we return from this function. Do not set the
   // STOPPED state immediately here.
   if (state_ != State::NOT_INITIALIZED && state_ != State::REMOVING_DATA_DIR)
@@ skipping 115 matching lines @@
   // TODO(poromov): Move to more Kiosk dedicated set-up phase.
   if (IsArcKioskMode())
     prefs->SetBoolean(prefs::kArcTermsAccepted, true);
 
   // Skip to show UI asking users to set up ARC OptIn preferences, if all of
   // them are managed by the admin policy. Note that the ToS agreement is anyway
   // not shown in the case of the managed ARC.
   if (AreArcAllOptInPreferencesManaged())
     prefs->SetBoolean(prefs::kArcTermsAccepted, true);
 
-  // If it is marked that sign in has been successfully done, then directly
-  // start ARC.
+  // If it is marked that sign in has been successfully done, if ARC has been
+  // set up to always start, then directly start ARC.
   // For testing, and for Kiosk mode, we also skip ToS negotiation procedure.
   // For backward compatibility, this check needs to be prior to the
   // kArcTermsAccepted check below.
-  if (prefs->GetBoolean(prefs::kArcSignedIn) ||
+  if (prefs->GetBoolean(prefs::kArcSignedIn) || ShouldArcAlwaysStart() ||
       IsArcOptInVerificationDisabled() || IsArcKioskMode()) {
     StartArc();
 
     // Skip Android management check for testing.
     // We also skip if Android management check for Kiosk mode,
     // because there are no managed human users for Kiosk exist.
     if (IsArcOptInVerificationDisabled() || IsArcKioskMode() ||
         (g_disable_ui_for_testing &&
          !g_enable_check_android_management_for_testing)) {
       return;
@@ skipping 293 matching lines @@
 
 #undef MAP_STATE
 
   // Some compilers report an error even if all values of an enum-class are
   // covered exhaustively in a switch statement.
   NOTREACHED() << "Invalid value " << static_cast<int>(state);
   return os;
 }
 
 }  // namespace arc