Adds a new checkbox for backup and restore in opt-in flow.

chrome/browser/chromeos/arc/arc_auth_service.h

Index: chrome/browser/chromeos/arc/arc_auth_service.h
diff --git a/chrome/browser/chromeos/arc/arc_auth_service.h b/chrome/browser/chromeos/arc/arc_auth_service.h
index db974a9a31f0276e6e0d3891daf60d2285cd437d..2869e29e08d1ee93dd277d040a321b492193fc5f 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service.h
+++ b/chrome/browser/chromeos/arc/arc_auth_service.h
@@ -24,6 +24,8 @@
 
 class ArcAppLauncher;
 class Profile;
+class ProfileOAuth2TokenService;

[xiyuan, 2016/06/29 21:36:38]

not used?

[malaykeshav, 2016/06/30 02:46:19]

Missed it while merging with ToT.
Done

+class PrefRegistrySimple;
 
 namespace ash {
 class ShelfDelegate;
@@ -93,6 +95,9 @@ class ArcAuthService : public ArcService,
   // It is called from chrome/browser/prefs/browser_prefs.cc.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
+  // It is called from chrome/browser/prefs/browser_prefs.cc.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
   static void DisableUIForTesting();
   static void SetShelfDelegateForTesting(ash::ShelfDelegate* shelf_delegate);