[iOS] Add FakeSyncService and factory for testing

components/sync_driver/fake_sync_service.h

Index: components/sync_driver/fake_sync_service.h
diff --git a/components/sync_driver/fake_sync_service.h b/components/sync_driver/fake_sync_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..951d539b144ff3e610352e8ab4a1fdb96e0918c8
--- /dev/null
+++ b/components/sync_driver/fake_sync_service.h
@@ -0,0 +1,60 @@
+// 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_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
+#define COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
+
+#include "components/sync_driver/sync_service.h"
+#include "google_apis/gaia/google_service_auth_error.h"
+
+namespace sync_driver {
+
+// Fake implementation of sync_driver::SyncService, used for testing.
+class FakeSyncService : public sync_driver::SyncService {
+ public:
+  FakeSyncService();
+  ~FakeSyncService() override;
+
+ private:
+  // sync_driver::SyncService:
+  bool HasSyncSetupCompleted() const override;
+  bool IsSyncActive() const override;
+  syncer::ModelTypeSet GetActiveDataTypes() const override;
+  void AddObserver(sync_driver::SyncServiceObserver* observer) override;
+  void RemoveObserver(sync_driver::SyncServiceObserver* observer) override;
+  bool HasObserver(
+      const sync_driver::SyncServiceObserver* observer) const override;
+  bool IsSyncEnabledAndLoggedIn() override;
+  void DisableForUser() override;
+  void RequestStop() override;
+  void RequestStart() override;
+  syncer::ModelTypeSet GetPreferredDataTypes() const override;
+  void OnUserChoseDatatypes(bool sync_everything,
+                            syncer::ModelTypeSet chosen_types) override;
+  void SetSyncSetupCompleted() override;
+  bool FirstSetupInProgress() const override;
+  void SetSetupInProgress(bool setup_in_progress) override;
+  bool setup_in_progress() const override;
+  bool ConfigurationDone() const override;
+  const GoogleServiceAuthError& GetAuthError() const override;
+  bool HasUnrecoverableError() const override;
+  bool backend_initialized() const override;
+  bool IsPassphraseRequiredForDecryption() const override;
+  base::Time GetExplicitPassphraseTime() const override;
+  bool IsUsingSecondaryPassphrase() const override;
+  void EnableEncryptEverything() override;
+  void SetEncryptionPassphrase(const std::string& passphrase,
+                               PassphraseType type) override;
+  bool SetDecryptionPassphrase(const std::string& passphrase) override;
+
+  // sync_driver::DataTypeEncryptionHandler:
+  bool IsPassphraseRequired() const override;
+  syncer::ModelTypeSet GetEncryptedDataTypes() const override;
+
+  GoogleServiceAuthError error_;
+};
+
+}  // namespace sync_driver
+
+#endif  // COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_