arc:Integration test for Arc package Chrome sync.

chrome/browser/chromeos/profiles/profile_helper.h

Index: chrome/browser/chromeos/profiles/profile_helper.h
diff --git a/chrome/browser/chromeos/profiles/profile_helper.h b/chrome/browser/chromeos/profiles/profile_helper.h
index 481aacd78c960b0a58d78b57f1d425acf9f60429..e987403d705bdece444121e1722ab6203d273768 100644
--- a/chrome/browser/chromeos/profiles/profile_helper.h
+++ b/chrome/browser/chromeos/profiles/profile_helper.h
@@ -29,6 +29,10 @@ namespace extensions {
 class ExtensionGarbageCollectorChromeOSUnitTest;
 }
 
+namespace arc {
+class SyncArcPackageHelper;
+}
+
 namespace ash {
 namespace test {
 class MultiUserWindowManagerChromeOSTest;
@@ -160,6 +164,7 @@ class ProfileHelper
   friend class ProfileListChromeOSTest;
   friend class SessionStateDelegateChromeOSTest;
   friend class SystemTrayDelegateChromeOSTest;
+  friend class arc::SyncArcPackageHelper;
   friend class ash::test::MultiUserWindowManagerChromeOSTest;
   friend class ::ArcAppTest;
   friend class ::test::BrowserFinderChromeOSTest;