arc: Enable silent PlayStore Sign-In.

chrome/browser/chromeos/arc/arc_auth_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_H_
 
 #include <memory>
 #include <ostream>
 #include <string>
@@ skipping 156 matching lines @@
 
   // syncable_prefs::PrefServiceSyncableObserver
   void OnIsSyncingChanged() override;
 
   // syncable_prefs::SyncedPrefObserver
   void OnSyncedPrefChanged(const std::string& path, bool from_sync) override;
 
   // ArcAuthContextDelegate:
   void OnContextReady() override;
   void OnPrepareContextFailed() override;
+  void OnAuthCodeRequested(const std::string& auth_code) override;
+  void OnAuthCodeFailed() override;
 
   // ArcAndroidManagementCheckerDelegate:
   void OnAndroidManagementChecked(
       policy::AndroidManagementClient::Result result) override;
 
   // Stops ARC without changing ArcEnabled preference.
   void StopArc();
 
   // StopArc(), then EnableArc(). Between them data clear may happens.
   // This is a special method to support enterprise device lost case.
@@ skipping 54 matching lines @@
   base::WeakPtrFactory<ArcAuthService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcAuthService);
 };
 
 std::ostream& operator<<(std::ostream& os, const ArcAuthService::State& state);
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_H_