[CrOS Tether] Add FakeCryptAuthService, a test double for CryptAuthService.

components/cryptauth/fake_cryptauth_service.h

Index: components/cryptauth/fake_cryptauth_service.h
diff --git a/components/cryptauth/fake_cryptauth_service.h b/components/cryptauth/fake_cryptauth_service.h
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+++ b/components/cryptauth/fake_cryptauth_service.h
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+// Copyright 2017 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_CRYPTAUTH_FAKE_CRYPTAUTH_SERVICE_H_
+#define COMPONENTS_CRYPTAUTH_FAKE_CRYPTAUTH_SERVICE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "components/cryptauth/cryptauth_service.h"
+#include "components/cryptauth/proto/cryptauth_api.pb.h"
+
+namespace cryptauth {
+
+class CryptAuthClientFactory;
+class CryptAuthDeviceManager;
+class CryptAuthEnrollmentManager;
+class SecureMessageDelegate;
+
+// Service which provides access to various CryptAuth singletons.
+class FakeCryptAuthService : public CryptAuthService {
+ public:
+  FakeCryptAuthService();
+  ~FakeCryptAuthService() override;
+
+  void set_cryptauth_device_manager(
+      CryptAuthDeviceManager* cryptauth_device_manager) {
+    cryptauth_device_manager_ = cryptauth_device_manager;
+  }
+
+  void set_cryptauth_enrollment_manager(
+      CryptAuthEnrollmentManager* cryptauth_enrollment_manager) {
+    cryptauth_enrollment_manager_ = cryptauth_enrollment_manager;
+  }
+
+  void set_device_classifier(const DeviceClassifier& device_classifier) {
+    device_classifier_ = device_classifier;
+  }
+
+  void set_account_id(const std::string& account_id) {
+    account_id_ = account_id;
+  }
+
+  // CryptAuthService:
+  CryptAuthDeviceManager* GetCryptAuthDeviceManager() override;
+  CryptAuthEnrollmentManager* GetCryptAuthEnrollmentManager() override;
+  DeviceClassifier GetDeviceClassifier() override;
+  std::string GetAccountId() override;
+  std::unique_ptr<SecureMessageDelegate> CreateSecureMessageDelegate() override;
+  std::unique_ptr<CryptAuthClientFactory> CreateCryptAuthClientFactory()
+      override;
+
+ private:
+  CryptAuthDeviceManager* cryptauth_device_manager_;
+  CryptAuthEnrollmentManager* cryptauth_enrollment_manager_;
+  DeviceClassifier device_classifier_;
+  std::string account_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeCryptAuthService);
+};
+
+}  // namespace cryptauth
+
+#endif  // COMPONENTS_CRYPTAUTH_FAKE_CRYPTAUTH_SERVICE_H_