arc-bridge: Introduce the ArcService class

chrome/browser/chromeos/arc/arc_auth_service_impl.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_impl.h"
-
-#include <utility>
-
-namespace arc {
-
-ArcAuthServiceImpl::ArcAuthServiceImpl() : binding_(this) {}
-
-ArcAuthServiceImpl::~ArcAuthServiceImpl() {
-  ArcBridgeService::Get()->RemoveObserver(this);
-}
-
-void ArcAuthServiceImpl::StartObservingBridgeServiceChanges() {
-  ArcBridgeService::Get()->AddObserver(this);
-}
-
-void ArcAuthServiceImpl::OnAuthInstanceReady() {
-  arc::AuthHostPtr host;
-  binding_.Bind(GetProxy(&host));
-  ArcBridgeService::Get()->auth_instance()->Init(std::move(host));
-}
-
-void ArcAuthServiceImpl::GetAuthCode(const GetAuthCodeCallback& callback) {
-  // TODO(victorhsieh): request auth code from LSO (crbug.com/571146).
-  callback.Run(mojo::String("fake auth code from ArcAuthService in Chrome"));
-}
-
-}  // namespace arc