arc: Notify ARC instance failures via callbacks.

chrome/browser/chromeos/arc/arc_auth_service.cc

 // Copyright 2015 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/chromeos/arc/arc_auth_service.h"
 
 #include <utility>
 
 #include "ash/shelf/shelf_delegate.h"
 #include "ash/shell.h"
@@ skipping 177 matching lines @@
   }
 
   return true;
 }
 
 void ArcAuthService::OnAuthInstanceReady() {
   arc_bridge_service()->auth_instance()->Init(
       binding_.CreateInterfacePtrAndBind());
 }
 
-void ArcAuthService::OnBridgeStopped() {
+void ArcAuthService::OnBridgeStopped(ArcBridgeService::StopReason reason) {
+  // TODO(crbug.com/625923): Use |reason| to report more detailed errors.
   if (waiting_for_reply_) {
     // Using SERVICE_UNAVAILABLE instead of UNKNOWN_ERROR, since the latter
     // causes this code to not try to stop ARC, so it would retry without the
     // user noticing.
     OnSignInFailed(arc::mojom::ArcSignInFailureReason::SERVICE_UNAVAILABLE);
   }
   if (!clear_required_)
     return;
   clear_required_ = false;
   chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->RemoveArcData(
@@ skipping 542 matching lines @@
       return os << kStateFetchingCode;
     case ArcAuthService::State::ACTIVE:
       return os << kStateActive;
     default:
       NOTREACHED();
       return os;
   }
 }
 
 }  // namespace arc