Add ArcAuthService to handle IPC request from ARC

components/arc/arc_auth_service.h

Index: components/arc/arc_auth_service.h
diff --git a/components/arc/arc_auth_service.h b/components/arc/arc_auth_service.h
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+// 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 COMPONENTS_ARC_ARC_AUTH_SERVICE_H_
+#define COMPONENTS_ARC_ARC_AUTH_SERVICE_H_
+
+#include "base/macros.h"
+#include "components/arc/arc_bridge_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 ArcAuthService : public AuthHost,
+                       public ArcBridgeService::Observer {
+ public:
+  ArcAuthService();
+  virtual ~ArcAuthService();
+
+  // Overrides ArcBridgeService::Observer
+  void OnAuthInstanceReady() override;
+
+  // Overrides AuthHost
+  void GetAuthCode(const GetAuthCodeCallback& callback) override;
+
+  // Starts listening to state changes of the ArcBridgeService.
+  // This must be called before the bridge service starts bootstrapping.
+  void StartObservingBridgeServiceChanges();
+
+ private:
+  mojo::Binding<AuthHost> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcAuthService);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_ARC_ARC_AUTH_SERVICE_H_