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diff --git a/ios/chrome/browser/sync/sync_setup_service.h b/ios/chrome/browser/sync/sync_setup_service.h
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+++ b/ios/chrome/browser/sync/sync_setup_service.h
@@ -0,0 +1,111 @@
+// Copyright 2012 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 IOS_CHROME_BROWSER_SYNC_SYNC_SETUP_SERVICE_H_
+#define IOS_CHROME_BROWSER_SYNC_SYNC_SETUP_SERVICE_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/strings/string16.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "sync/internal_api/public/base/model_type.h"
+#include "sync/internal_api/public/util/syncer_error.h"
+
+namespace sync_driver {
+class SyncService;
+}
+
+class PrefService;
+
+// Class that allows configuring sync. It handles enabling and disabling it, as
+// well as choosing datatypes. Most actions are delayed until a commit is done,
+// to allow the complex sync setup flow on iOS.
+class SyncSetupService : public KeyedService {
+ public:
+  typedef enum {
+    kNoSyncServiceError,
+    kSyncServiceSignInNeedsUpdate,
+    kSyncServiceCouldNotConnect,
+    kSyncServiceServiceUnavailable,
+    kSyncServiceNeedsPassphrase,
+    kSyncServiceUnrecoverableError,
+    kLastSyncServiceError = kSyncServiceUnrecoverableError
+  } SyncServiceState;
+
+  // The set of user-selectable datatypes handled by Chrome for iOS.
+  typedef enum {
+    kSyncBookmarks,
+    kSyncOmniboxHistory,
+    kSyncPasswords,
+    kSyncOpenTabs,
+    kSyncAutofill,
+    kNumberOfSyncableDatatypes
+  } SyncableDatatype;
+
+  SyncSetupService(sync_driver::SyncService* sync_service, PrefService* prefs);
+  ~SyncSetupService() override;
+
+  // Returns the |syncer::ModelType| associated to the given
+  // |SyncableDatatypes|.
+  syncer::ModelType GetModelType(SyncableDatatype datatype);
+
+  // Returns whether sync is enabled.
+  virtual bool IsSyncEnabled() const;
+  // Enables or disables sync. Changes won't take effect in the sync backend
+  // before the next call to |CommitChanges|.
+  virtual void SetSyncEnabled(bool sync_enabled);
+
+  // Returns all currently enabled datatypes.
+  syncer::ModelTypeSet GetDataTypes() const;
+  // Returns whether the given datatype is enabled.
+  virtual bool IsDataTypeEnabled(syncer::ModelType datatype) const;
+  // Enables or disables the given datatype. To be noted: this can be called at
+  // any time, but will only be meaningful if |IsSyncEnabled| is true and
+  // |IsSyncingAllDataTypes| is false. Changes won't take effect in the sync
+  // backend before the next call to |CommitChanges|.
+  void SetDataTypeEnabled(syncer::ModelType datatype, bool enabled);
+
+  // Returns whether the user needs to enter a passphrase or enable sync to make
+  // sync work.
+  bool UserActionIsRequiredToHaveSyncWork();
+
+  // Returns whether all datatypes are being synced.
+  virtual bool IsSyncingAllDataTypes() const;
+  // Sets whether all datatypes should be synced or not. Changes won't take
+  // effect before the next call to |CommitChanges|.
+  virtual void SetSyncingAllDataTypes(bool sync_all);
+
+  // Returns the current sync service state.
+  virtual SyncServiceState GetSyncServiceState();
+
+  // Returns true if the user has gone through the initial sync configuration.
+  // This method is guaranteed not to start the sync backend so it can be
+  // called at start-up.
+  bool HasFinishedInitialSetup();
+
+  // Pauses sync allowing the user to configure what data to sync before
+  // actually starting to sync data with the server.
+  void PrepareForFirstSyncSetup();
+
+  // Commit the current state of the configuration to the sync backend.
+  void CommitChanges();
+
+  // Returns true if there are uncommitted sync changes;
+  bool HasUncommittedChanges();
+
+ private:
+  // Enables or disables sync. Changes won't take effect in the sync backend
+  // before the next call to |CommitChanges|. No changes are made to the
+  // currently selected datatypes.
+  void SetSyncEnabledWithoutChangingDatatypes(bool sync_enabled);
+
+  sync_driver::SyncService* const sync_service_;
+  PrefService* const prefs_;
+  syncer::ModelTypeSet user_selectable_types_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncSetupService);
+};
+
+#endif  // IOS_CHROME_BROWSER_SYNC_SYNC_SETUP_SERVICE_H_