arc-bridge: Introduce the ArcService class

chrome/browser/chromeos/arc/arc_auth_service_impl.h

-// 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_IMPL_H_
-#define CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_IMPL_H_
-
-#include "base/macros.h"
-#include "components/arc/arc_bridge_service.h"
-#include "components/arc/auth/arc_auth_service.h"
-#include "components/arc/common/auth.mojom.h"
-#include "mojo/public/cpp/bindings/binding.h"
-
-namespace arc {
-
-// This class proxies the request from the client to fetch an auth code from
-// LSO.
-class ArcAuthServiceImpl : public ArcAuthService,
-                           public AuthHost,
-                           public ArcBridgeService::Observer {
- public:
-  ArcAuthServiceImpl();
-  ~ArcAuthServiceImpl() override;
-
- private:
-  // Overrides ArcBridgeService::Observer.
-  void OnAuthInstanceReady() override;
-
-  // Overrides AuthHost.
-  void GetAuthCode(const GetAuthCodeCallback& callback) override;
-
-  // Overrides ArcAuthService.
-  // Starts listening to state changes of the ArcBridgeService.
-  // This must be called before the bridge service starts bootstrapping.
-  void StartObservingBridgeServiceChanges() override;
-
-  mojo::Binding<AuthHost> binding_;
-
-  DISALLOW_COPY_AND_ASSIGN(ArcAuthServiceImpl);
-};
-
-}  // namespace arc
-
-#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_IMPL_H_