[Merge To M54]arc: Fix race when arc package sync service starts.

chrome/browser/sync/test/integration/sync_arc_package_helper.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/sync/test/integration/sync_arc_package_helper.h"
 
 #include <string>
 #include <unordered_map>
 
 #include "base/command_line.h"
@@ skipping 153 matching lines @@
   DCHECK(arc_app_list_prefs);
 
   base::RunLoop run_loop;
   arc_app_list_prefs->SetDefaltAppsReadyCallback(run_loop.QuitClosure());
   run_loop.Run();
 
   instance_map_[profile].reset(new FakeAppInstance(arc_app_list_prefs));
   DCHECK(instance_map_[profile].get());
   arc_app_list_prefs->app_instance_holder()->SetInstance(
       instance_map_[profile].get());
+  // OnPackageListRefreshed will be called when AppInstance is ready.
+  // For fakeAppInstance we use SendRefreshPackageList to make sure that
+  // OnPackageListRefreshed will be called.
+  instance_map_[profile]->SendRefreshPackageList(
+      std::vector<arc::mojom::ArcPackageInfo>());
 }
 
 void SyncArcPackageHelper::InstallPackage(
     Profile* profile,
     const mojom::ArcPackageInfo& package) {
   ArcAppListPrefs* arc_app_list_prefs = ArcAppListPrefs::Get(profile);
   DCHECK(arc_app_list_prefs);
   FakeAppInstance* fake_app_instance = static_cast<FakeAppInstance*>(
       arc_app_list_prefs->app_instance_holder()->instance());
 
@@ skipping 59 matching lines @@
     if (package1_info->last_backup_android_id !=
         package2_info->last_backup_android_id)
       return false;
     if (package1_info->last_backup_time != package2_info->last_backup_time)
       return false;
   }
   return true;
 }
 
 }  // namespace arc