arc: Notify ARC instance failures via callbacks.

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 106 matching lines @@
 
   State state() const { return state_; }
 
   std::string GetAndResetAuthCode();
 
   // Adds or removes observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // ArcBridgeService::Observer:
-  void OnBridgeStopped() override;
+  void OnBridgeStopped(ArcBridgeService::StopReason reason) override;
 
   // InstanceHolder<mojom::AuthInstance>::Observer:
   void OnInstanceReady() override;
 
   // AuthHost:
   // For security reason this code can be used only once and exists for specific
   // period of time.
   void GetAuthCodeDeprecated(
       const GetAuthCodeDeprecatedCallback& callback) override;
   void GetAuthCode(const GetAuthCodeCallback& callback) override;
@@ skipping 81 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_