Start ARC and sign in after Chrome OS login

chrome/browser/ui/app_list/arc/arc_app_test.cc

Index: chrome/browser/ui/app_list/arc/arc_app_test.cc
diff --git a/chrome/browser/ui/app_list/arc/arc_app_test.cc b/chrome/browser/ui/app_list/arc/arc_app_test.cc
index a529b2fb59fabe5b89ad35521622a74254b7f56b..7d4b18384b5276a446589c8c922fa3ad6350c60e 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_test.cc
+++ b/chrome/browser/ui/app_list/arc/arc_app_test.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_list/arc/arc_app_list_prefs.h"
 #include "chrome/browser/ui/app_list/arc/arc_app_list_prefs_factory.h"
+#include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/arc_service_manager.h"
@@ -101,9 +102,14 @@ void ArcAppTest::SetUp(Profile* profile) {
   arc_app_list_pref_->SetDefaltAppsReadyCallback(run_loop.QuitClosure());
   run_loop.Run();
 
-  arc::SetArcPlayStoreEnabledForProfile(profile_, true);
   // Check initial conditions.
-  EXPECT_FALSE(arc_session_manager_->IsSessionRunning());
+  if (arc::ShouldArcAlwaysStart()) {
+    // When ARC first starts, it runs in opt-out mode of Play Store.
+    EXPECT_TRUE(arc_session_manager_->IsSessionRunning());
+  } else {
+    arc::SetArcPlayStoreEnabledForProfile(profile_, true);
+    EXPECT_FALSE(arc_session_manager_->IsSessionRunning());
+  }
 
   app_instance_.reset(new arc::FakeAppInstance(arc_app_list_pref_));
   arc_service_manager_->arc_bridge_service()->app()->SetInstance(