Start ARC and sign in after Chrome OS login

chrome/browser/ui/app_list/arc/arc_app_test.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/ui/app_list/arc/arc_app_test.h"
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
@@ skipping 83 matching lines @@
       base::MakeUnique<arc::ArcPlayStoreEnabledPreferenceHandler>(
           profile_, arc_session_manager_.get());
   arc_play_store_enabled_preference_handler_->Start();
 
   arc_app_list_pref_ = ArcAppListPrefs::Get(profile_);
   DCHECK(arc_app_list_pref_);
   base::RunLoop run_loop;
   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(
       app_instance_.get());
 }
 
 void ArcAppTest::CreateFakeAppsAndPackages() {
   arc::mojom::AppInfo app;
   // Make sure we have enough data for test.
   for (int i = 0; i < 3; ++i) {
@@ skipping 102 matching lines @@
   }
 }
 
 bool ArcAppTest::FindPackage(const arc::mojom::ArcPackageInfo& package) {
   for (auto fake_package : fake_packages_) {
     if (package.package_name == fake_package.package_name)
       return true;
   }
   return false;
 }